Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T55: Correlated Electron Materials I |
Hide Abstracts |
Sponsoring Units: GMAG Chair: Adam Aczel, Oak Ridge Nat'l Lab Room: Room 305 |
Thursday, March 9, 2023 11:30AM - 11:42AM |
T55.00001: Multipole polaron in the devil's staircase of CeSb Yosuke Arai, Kenta Kuroda, Takuya Nomoto, Zi How Tin, Shunsuke Sakuragi, Cédric Bareille, Shuntaro Akebi, Kifu Kurokawa, Yuto Kinoshita, Weilu Zhang, Shik Shin, Masashi Tokunaga, Hideaki Kitazawa, Yoshinori Haga, Hiroyuki Suzuki, Shigeki Miyasaka, Setsuko Tajima, Kazuaki Iwasa, Ryotaro Arita, Takeshi Kondo CeSb has been an intriguing candidate for probing electronic correlations because of the anomalous magneto-structural transitions below TN~17 K, called “devil’s staircase". The established 4f order induces a tetragonal lattice contraction, dramatic changes in electron transports, and electronic reconstructions [1]. All these facts suggest the importance of the interplay between the localized 4f states and the itinerant electrons for understanding the anomalous transitions. However, revealing the underlying many-body interaction going through the devil’s staircase has remained out of reach. |
Thursday, March 9, 2023 11:42AM - 11:54AM |
T55.00002: A-type antiferromagnetic order in the Zintl-phase insulator EuZn2P2 Tanya Berry, Veronica Stewart, Benjamin W. Y. Redemann, Chris J Lygouras, Nicodemos Varnava, David Vanderbilt, Tyrel M McQueen Zintl phases, containing strongly covalently bonded frameworks with separate ionically bonded ions, have emerged as a critical materials family in which to couple magnetism and strong spin-orbit coupling to drive diverse topological phases of matter. Here we report the single-crystal synthesis, magnetic, thermodynamic, transport, and theoretical properties of the Zintl compound EuZn2P2 that crystallizes in the anti-La2O3 (CaAl2Si2) P-3m1 structure, containing triangular layers of Eu2+ ions. In-plane resistivity measurements reveal insulating behavior with an estimated activation energy of Eg=0.11eV. Specific heat and magnetization measurements indicate antiferromagnetic ordering at TN=23K. Curie-Weiss analysis of in-plane and out of plane magnetic susceptibility from T=150 to 300 K yields peff=8.61 for μ0H⊥c and peff=7.74 for μ0H//c, close to the expected values for the 4f7 J=S=7/2 Eu2+ ion and indicative of weak anisotropy. Below TN, a significant anisotropy of χ⊥/χ//≈2.3 develops, consistent with A-type magnetic order as observed in isostructural analogs and as predicted by the density functional theory calculations reported herein. The positive Weiss temperatures of θW=19.2K for μ0H⊥c and θW=41.9K for μ0H//c show a similar anisotropy and suggest competing ferromagnetic and antiferromagnetic interactions. Comparing Eu magnetic ordering temperatures across trigonal EuM2X2 (M= divalent metal, X= pnictide) shows that EuZn2P2 exhibits the highest ordering temperature, with variations in TN correlating with changes in expected dipolar interaction strengths within and between layers and independent of the magnitude of electrical conductivity. These results provide experimental validation of the crystochemical intuition that the cation Eu2+ layers and the anionic (M2X2)2– framework can be treated as electronically distinct subunits, enabling further predictive materials design. |
Thursday, March 9, 2023 11:54AM - 12:06PM |
T55.00003: A microscopic Kondo lattice model for the heavy fermion antiferromagnet CeIn3 Esteban A Ghioldi, Wolfgang J Simeth, Zhentao Wang, David M Fobes, Andrey Podlesnyak, Nakheon Sung, Eric D Bauer, Jakob Lass, Jakub Vonka, Daniel Mazzone, Christof Niedermayer, Yusuke Nomura, Ryotaro Arita, Cristian Batista, Filip Ronning, Marc Janoschek Electrons at the border of localization generate exotic states of matter across all classes of strongly correlated electron materials. Heavy electron metals are a model example, in which magnetic interactions arise from the opposing limits of localized and itinerant electrons. This remarkable duality is intimately related to the emergence of a plethora of novel quantum matter states, such as unconventional superconductivity, electronic-nematic, hidden order and most recently topological states, including skyrmion crystals, topological Kondo insulators and putative chiral superconductors. The outstanding challenge is that the archetypal Kondo lattice model that captures the underlying electronic dichotomy is notoriously difficult to solve for real materials. Using the prototypical strongly correlated antiferromagnet CeIn3, we will show that a multi-orbital periodic Anderson model embedded with input from ab initio band structure calculations can be reduced to a simple Kondo-Heisenberg model, which captures the magnetic interactions quantitatively. This tractable Hamiltonian is validated via high-resolution neutron spectroscopy that reproduces accurately the full magnon dispersion of CeIn3. |
Thursday, March 9, 2023 12:06PM - 12:18PM |
T55.00004: Unexpected resistivity minimum in a highly-localized Gd-system Eundeok Mun, Zachary S Podrebersek The family of intermetallic compounds, RCuAs2 (R = Nd, Sm, Gd, Tb, and Dy), all exhibit a pronounced resistivity minimum above their antiferromagnetic ordering temperature (TN). Although the resistivity minimum has been frequently observed in Kondo materials, the same microscopic mechanism cannot be applied to these highly localized 4f-electron systems. To isolate and identify the cause of this behavior we study Gd-based compounds, without the Kondo and crystalline electric field (CEF) effects. Single crystals of GdxY1-xCuAs2 are synthesized and characterized by magnetization, resistivity, and specific heat measurements. GdCuAs2 clearly shows a non-logarithmic resistivity upturn above TN = 10.6 K. Although the thermodynamic and transport property measurements show a suppression of TN at x ~ 0.3, surprisingly the resistivity minimum persists over the entire doping range. Magnetic susceptibility measurement for x ~ 0.3 indicates a broad local maximum at low temperatures, suggesting a spin glass state caused by disorder or magnetic frustration. In this talk, we show how chemical substitutions influence the resistivity minimum observed in this system and compare it with theoretical models such as the frustrated RKKY mechanism. |
Thursday, March 9, 2023 12:18PM - 12:30PM |
T55.00005: Z4 Electronic Fractals in NdNiO3 Forrest Simmons, Jiarui Li, Jonathan Pelliciari, Claudio Mazzoli, Sara Catalano, Jerzy Sadowski, Abraham L Levitan, Marta Gibert, Erica W Carlson, Jean-Marc Triscone, Stuart Wilkins, Riccardo Comin Rare-earth nickelates have a phase diagram characterized by overlapping electronic, structural |
Thursday, March 9, 2023 12:30PM - 12:42PM |
T55.00006: Electron spin resonance measurements of spin liquid candidate TbInO3 with superconducting resonators Sandesh S Kalantre, Johanna Nordlander, Margaret A Anderson, Julia A Mundy, David Goldhaber-Gordon
|
Thursday, March 9, 2023 12:42PM - 12:54PM |
T55.00007: Insulating ferromagnetic state and orbital-selective Mott phases in an iron chain syste Ling-Fang Lin, Yang Zhang, Gonzalo Alvarez, Jacek Herbrych, Adriana Moreo, Elbio R Dagotto Studies of orbital-selective and magnetic physics in transition metal compounds continue to attract the attention of the condensed matter community. Here, we report a systematic investigation of the quasi-one-dimensional iron chain Ce2O2FeSe2 based on a multiorbital Hubbard model using many-body computer simulations. We focus on the competition between ferromagnetic and antiferromagnetic tendencies and on the complex interplay of hopping amplitudes, Coulomb interactions, Hund’s coupling, crystal-field splitting, and doping effects. Firstly, our calculations and analysis showed that large entanglements between doubly occupied and half-filled orbitals play a key role in stabilizing the insulating ferromagnetic phase [1]. Secondly, with the effect of doping, a variety of exotic electronic and magnetic states, such as orbital-selective Mott phases and magnetic “block” phases, were predicted due to the competition of the many tendencies [2]. Our theoretical phase diagram will hopefully encourage a more detailed experimental study of 1D iron chalcogenide compounds, or related systems. |
Thursday, March 9, 2023 12:54PM - 1:06PM |
T55.00008: Enhanced magnetic anisotropy in lanthanum M-type hexaferrites by quantum-confined charge transfer Durga Paudyal, Churna B Bhandari, Michael Flatte’ Iron-based hexaferrites are critical-element-free permanent magnet components of magnetic devices. Of particular interest is electron-doped M-type hexaferrite i.e., LaFe12O19 (LaM) in which extra electrons introduced by lanthanum substitution of barium/strontium play a key role in uplifting the magnetocrystalline anisotropy. We investigate the electronic structure of lanthanum hexaferrite using a density functional theory with localized charge density, which reproduces semiconducting behavior and identifies the origin of the very large magnetocrystalline anisotropy. Localized charge transfer from lanthanum to the iron at the crystal's 2a site produces a narrow 3dz2 valence band strongly locking the magnetization along the c axis. The calculated uniaxial magnetic anisotropy energies from fully self-consistent calculations are nearly double the single-shot values, and agree well with available experiments. The chemical similarity of lanthanum to other rare earths suggests that LaM can host other rare earths possessing nontrivial 4f electronic states for, e.g., microwave-optical quantum transduction. |
Thursday, March 9, 2023 1:06PM - 1:18PM Author not Attending |
T55.00009: Magnetism dynamics in polycrystalline Pr-doped manganites: role of the phase separation Diego Carranza-Celis, Christian T Wolowiec, ALI C BASARAN, Pavel Salev, IVAN K SCHULLER, Juan G Ramirez Mixed valence manganites often have complex phase diagrams where different phases can coexist. Proper stoichiometry allows the coexistence of ferromagnetic metal and antiferromagnetic charge ordered insulator phases in (La,Pr,Ca)MnO3 (LPCMO). The phase separation in LPCMO has two behaviors: a fluid-like phase separation (FPS)—at intermediate temperatures—where the phase morphology evolution depends strongly on external stimuli, and a static phase separation (SPS)—at lower temperatures—that has a glass-like behavior. By performing ferromagnetic resonance and AC susceptibility measurements, we demonstrate that the magnetism dynamics of polycrystalline manganite La5/8-xPrxCa3/8MnO3 pellets are driven by the phase separation. Our results provide an insight into the mechanism behind the FPS-to-SPS transition in the LPCMO system. |
Thursday, March 9, 2023 1:18PM - 1:30PM |
T55.00010: Magnonic dispersion of Er2O3 Mehdi Maleki Sanukesh, Michael E Flatté Rare-earth magnets may provide useful magnetic properties for quantum technologies, including quantum transduction and quantum memories. Here we calculate the band structure of magnons in antiferromagnetic Er2O3. |
Thursday, March 9, 2023 1:30PM - 1:42PM |
T55.00011: Simultaneous field-induced strain and strain-engineered magnetization establish non-collinear AFM UO2 as the strongest known piezomagnet. Marcelo Jaime, Yogesh Sharma, Amanda Huon, Mathew M Schneider, Rico Schoenemann, Michael Fitzsimmons, Andres Saul, Myron B Salamon, Krzysztof Gofryk, Aiping Chen Actinide materials have various applications that range from nuclear energy to quantum computing. Robust piezomagnetism (PZM), a rare property of non-collinear antiferromagnetic materials that could enable control of a magnetic field by an electric field in hybrid piezoelectric/piezomagnetic devices, was first suggested in UO2 from strain measurements in very large magnetic fields below the Néel temperature TN = 30 K [1]. Confirmation of PZM requires, however, observation of the reciprocal property, i.e. strain-induced magnetization. Recent results demonstrate the feasibility of strain engineering in UO2 epitaxial thin films and explore the origin of induced ferromagnetism [2]. It is found that UO2+x thin films are hypo-stoichiometric (x<0) with in-plane tensile strain, while they are hyper-stoichiometric (x>0) with in-plane compressive strain. In addition to establishing PZM in UO2, this work reveals the correlation among strain, point defects, and ferromagnetism in strain-engineered UO2+x thin films. The results offer new opportunities to understand the influence of coupled order parameters on the emergent properties of actinide thin films. [1] M. Jaime et al., Nat. Comm. 8, 99 (2017). [2] Y. Sharma et al., Adv. Sci. 2203473 (2022). |
Thursday, March 9, 2023 1:42PM - 1:54PM |
T55.00012: Stochastic nature of the ultrasharp metamagnetic jumps in Dy-Fe-Ga-based intermetallic alloys Subham Majumdar, Suman Mondal, Mintu Karmakar, Raja Paul DyFe3 is a know ferrimagnetic material with Dy and Fe sublattices remaining antiparallel to each other. We created a disorder at the Fe sublattice by doping a small amount of nonmagnetic Ga. The resulting alloys (DyFe3-xGax, x = 0.5,1) show spectacular step-like discontinuous jumps in the magnetization versus temperature isotherm at 2 K. The jumps are of different heights, and they are innumerable in number. The number of jumps is found to be higher in the case of x = 0.5 sample compared to that of x = 1. These multiple jumps vanish as we increase the temperature above 4 K. The profile of the jumps follows a certain pattern, but the critical fields for the jumps are random. The height distribution of the jumps follows a power law indicating a scale-invariant nature of the jumps. The jumps also do not show any temporal effect, i.e., they do not occur spontaneously even when one waits for a long time slightly below a metamagnetic field. The magnetization does not show significant relaxation, and the jumps do not show any systematic change with the sweep rate of the external driving field. To understand the origin of the jumps, we have formulated a two-dimensional random bond Ising type spin system. Our computational work based on classical Monte Carlo simulation can qualitatively reproduce the jumps and their scale-invariant character. It indicates that the disorder due to the random occupancy of Ga at the Fe site plays an important role, and it is instrumental in the formation of antiferromagnetically coupled Dy and Fe clusters of finite size. The flipping of Dy and Fe clusters is responsible for the observed discrete avalanche-like features in the hysteresis loop. The present phenomenon can be well described within the realm of self-organized criticality. |
Thursday, March 9, 2023 1:54PM - 2:06PM |
T55.00013: The anomalous Hall conductivity of bulk and 2D Cr2Te3 Renat Sabirianov, Jaeil Bai, Mengying Bian, Chang Huai, Hao Zeng Chromium telluride (Cr2Te3) is an inorganic chemical compound that exhibits ferromagnetic properties (Tc=195 K) and a large perpendicular anisotropy of 7 × 105 J m−3. Recently, ferromagnetic Cr2Te3 nanorods were synthesized that exhibit hard and soft phase coexistence (Nanoscale, 2018, 10, 11028). We present the density functional study of the anomalous Hall effect of bulk and 2D Cr2Te3. The effect of magnetic texture is investigated as these layered materials show possibility of canting of the Cr moments in the ordered vacancy layers. We discuss these results in view of recent anomalous Hall effect measurement. |
Thursday, March 9, 2023 2:06PM - 2:18PM |
T55.00014: Magnetoelastic properties of 5f ferromagnet UCu2P2 Volodymyr Buturlim, Petr Petr, Oleksandra Koloskova, Jiri Prchal, Martin Divis, Ilja Turek, Krzysztof Gofryk, Fuminori Honda, Dariusz Kaczorowski, Ladislav Havela UCu2P2, a Zintl phase with the CaAl2Si2 structure type, is a 5f ferromagnet with record-high Curie temperature among U compounds, TC = 216 K [1]. While the size of the magnetic moment 2.0 μB/U is not surprising due to U-U spacing exceeding the Hill limit, the reasons for the high TC are less understood. Ab-initio calculations reveal only very weak hybridization of the U-5f states with the 6d states as well as with electronic states of Cu and P. It seems that a transfer of U-6d states to the P-3p states is an important ingredient, which was highlighted by a rapid increase of TC under hydrostatic pressure so that a room-temperature 5f ferromagnetism could be demonstrated. Besides magnetization, transport, and heat capacity studies on single crystals we performed also characterization of a polycrystalline material, which has TC = 219 K. Thermal expansion study revealed a moderate increase of both lattice parameters just below TC, so we can exclude that the pressure enhancement of TC is driven simply by thermodynamics (via the Ehrenfest relation). Hence the reasons have to be attributed to the enhancement of specific U-U couplings upon compression. Indeed, ab initio calculations probing the energy enhancement upon moments reversal gave a semi-quantitative account of the observed tendency of TC. |
Thursday, March 9, 2023 2:18PM - 2:30PM |
T55.00015: New rare earth lean permanent magnets from computational design and the challenge of the 4f electrons Heike C Herper, Olle Eriksson Computational design has become a powerful tool to tailor materials properties such as the magnetocrystalline anisotropy (MCA) of permanent magnets. Fe-rich REFe12−xZx (RE = rare earth) phases are promising candidates for future permanent magnets. However, accurate predictions of magnetic properties of 4f systems are challenging since the localization of the 4f states varies with the RE element and its chemical environment and different degrees of localization might call for different theoretical modelling. Aiming to predict new high-performance permanent magnets we used NdFe11Ti as a prototype for an 1:12 magnet and investigated the dependence of the magnetic properties of the electronic structure approach. While for Sm a core treatment is sufficient [1], the conic MCA of NdFe11Ti needs at least an intermediate sized Hubbard U correction [2]. Fully localized Nd 4f states wrongly produce a uniaxial MCA at low temperatures. Using the Nd1−xYxFe12−yTiy as a test case we investigated how far the strong dependence of the magnetic properties on the description of the Nd 4 f states influences the prediction of new phases. The magnetic properties were determined in a full-potential LMTO framework (RSPt) while for structural relaxation VASP was used. Results were compared to single crystal measurements. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700