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 A30: Heavy Fermions I |
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Sponsoring Units: DCMP Chair: Michael Smith, Argonne National Lab Room: Room 222/223 |
Monday, March 6, 2023 8:00AM - 8:12AM |
A30.00001: Hybridization in Ce-based heavy-fermion compounds in the vicinity of quantum criticality Thomas U Boehm, Nicholas Sirica, Christopher C Homes, G.Lawrence Carr, Yu Liu, Eric D Bauer, Filip Ronning The f-electrons of cerium hybridize with conduction electrons to produce coherent heavy bands at low temperatures, which dictates the ground state properties of the system. The CeTX series of compounds (T=transition metal, X=p-block element) have a ZrNiAl structure type with Ce atoms sitting on a distorted Kagome lattice. For the studied compounds, small changes in the unit cell volume drive the system into a variety of interesting ground states across a quantum critical point. CePdAl illustrates frustrated magnetism and is a candidate quantum spin liquid, whereas the mixed valent metals CeIrSn and CeRhSn, which are in closest proximity to the quantum critical point show a drastically increased Kondo temperature and strong Ising anisotropy at low temperatures. A direct and quantitative probe of the hybridization gap generated by the c-f hybridization is provided by infrared absorption experiments. Here we present our results from temperature dependent Fourier-transformed infrared reflection spectroscopic measurements on a series of Ce-based compounds to study the evolution of the c-f hybridization across the quantum critical point. |
Monday, March 6, 2023 8:12AM - 8:24AM |
A30.00002: Transport and noise measurements in long, narrow YbRh2Si2 wires Liyang Chen, Dale T Lowder, Emine Bakali, Aaron M Andrews, Werner Schrenk, Monika Waas, Robert Svagera, Gaku Eguchi, Lukas Prochaska, Qimiao Si, Silke Buehler-Paschen, Douglas Natelson The heavy fermion compound YbRh2Si2 exhibits a magnetic field-induced quantum critical point, between an antiferromagnetically ordered phase and a paramagnetic heavy Fermi liquid phase. Although the zero-field magnetic ordering temperature is only 70 mK, quantum critical non-Fermi liquid behavior persists over a broad temperature range, providing a wide parameter space to study the electron correlations in this “strange metal” system. Previous shot noise measurements on short YbRh2Si2 nanowires show a strong suppression compared to Fermi liquid metals like gold, and it is important to assess if this is an essential feature of strange metals due to a lack of quasiparticles, or whether strong electron-phonon coupling plays a role. Here we fabricate long, narrow YbRh2Si2 wires using the same method as in the short nanowire experiments and infer the electron-phonon energy transfer strength using the noise measurement. The results show the electron-phonon energy transfer strength in YbRh2Si2 is comparable with that in a gold device, meaning that the suppression of shot noise in YbRh2Si2 nanowires is not due to phonons. Our measurements provide supplemental support for previous work and quantify the energy transfer strength from electron to phonon in YbRh2Si2. |
Monday, March 6, 2023 8:24AM - 8:36AM |
A30.00003: Pressure induced valence and structural transition in Ce2Ni3Ge5 heavy fermion superconductor Ravhi Kumar, Melanie White, Leon Petit, Zdzislawa Szotek, Anuroopa Behatha, Sébastien Lebègue, Vaitheeswaran Ganapathy, Kanchana Venkatakrishnan, Daniel Haskel, Gilberto Fabbris, Russell J Hemley, Jun Gouchi, Yoshiya Uwatoko, Thamizhavel Arumugam Valence fluctuation, magnetic ordering, orbital fluctuations and crystal structure play important roles in the origin of pressure induced superconductivity in the heavy fermion materials across quantum critical point (QCP) [1]. Here we report the Ce valence and crystal structure behavior of the heavy fermion material Ce2Ni3Ge5 around the proximity of superconducting regime at high pressures and low temperatures. The valence of Ce continuously increases showing an anomaly around critical pressure where superconductivity was reported, and a pressure induced structural transition from the orthorhombic to a monoclinic type of symmetry occurs above 5 GPa. The results of the Self-Interaction Correction – Local Spin Density Approximation (SIC-LSDA) theoretical calculations show the Ce 4f electrons delocalization upon compression is consistent with experiments. |
Monday, March 6, 2023 8:36AM - 8:48AM |
A30.00004: High field magnetization anisotropy and thermodynamic property in CeIn3 Yu Liu, Esteban A Ghioldi, Neil Harrison, Shannon S Fender, Priscila Rosa, Joe D Thompson, Eric D Bauer, Yusuke Nomura, Ryotaro Arita, Zhentao Wang, Cristian Batista, Filip Ronning The strongly correlated antiferromagnet CeIn3 displays fascinating phenomena including pressure and magnetic field-induced quantum criticality, Fermi surface transformations, and unconventional superconductivity. A non-trivial phase diagram, where the suppression of the Neel temperature was found to be anisotropic by transport measurements in a large magnetic field Hc ~ 60 - 80 T, with strength comparable to the crystal field energy scale [1]. A microscopic Kondo lattice model has been developed that quantitatively reproduces the low energy magnetic excitation spectrum [2]. To validate this model, we derived the magnetic exchange interaction of the full J = 5/2 multiplet and computed the anisotropic magnetization in high magnetic field. In this talk, I will discuss magnetization measurements of cubic CeIn3 along [100], [110], and [111] up to 60 T to derive the cubic anisotropy of the exchange interactions. The results reasonably validate our theoretical low-energy model that includes the excited crystal field levels. Moreover, we observed new energy scales around H ~ 0.5 T in low field magnetization and T ~ 3 K in specific heat measurements. |
Monday, March 6, 2023 8:48AM - 9:00AM |
A30.00005: Possible scenarios for the origin of multiple superconducting phases in CeRh2As2 Sanu Mishra, Yu Liu, Eric D Bauer, Sean Thomas, Filip Ronning The recently discovered superconductor CeRh2As2 has attracted much attention due to the presence of a field-induced, even-odd parity transition within the superconducting (SC) state at μ0H* ≈ 4 T applied along the tetragonal c axis [1,2]. Further, a new state precursing the SC state occurs below T0 ~ 0.4 K and was suggested to be a quadrupole-density-wave (QDW) state [3]. |
Monday, March 6, 2023 9:00AM - 9:12AM |
A30.00006: Effect of Pr substitution on the valence transition in Ce1-xPrxOs4Sb12 Leticia M Ramos, Pei-Chun Ho, Tatsuya Yanagisawa, John Singleton, M Brian Maple At low temperatures T, the filled skutterudite CeOs4Sb12 is a heavy-fermion compensated semimetal and exhibits a Spin-Density-Wave (SDW) phase at ~1 K. Theoretical predictions suggested that it possibly possesses topologically protected states where electron and hole Fermi surfaces (FS) may coexist at low temperatures. Through previous studies of this compound, we’ve found that a near spherical FS above 28 T, enchantment of cyclotron mass below 35 T, and a valence transition occurs with a striking reverse wedge-shape T-H phase diagram [1,2,3]. When substituting the rare-earth element Pr for Ce, hole-doping is introduced in CeOs4Sb12. In this report, we present the influence of Pr-substitution on the electronic properties, T-H phase boundaries of the valence transition, and carrier density in Ce1xPrxOs4Sb12 (x = 0.1 and 0.2). |
Monday, March 6, 2023 9:12AM - 9:24AM |
A30.00007: Effects of Ge doping in Yb2Si2Al, a mixed valence Shastry-Sutherland Lattice compound Liam J Scanlon, Brennan J Arnold, Sean R Parkin, William J Gannon Yb2 Si2Al s an intermediate valence Yb compound with Yb ions on the 2 dimensional Shastry-Sutherland lattice (SSL). The material does not order magnetically with temperatures as low as T= 2 K and shows signs of Kondo coherence and non-Fermi liquid behavior at low temperatures. Substituting Mg in Yb2 Al1-x MgxSi2 drives the ground state to antiferromagnetic order. [1-3] |
Monday, March 6, 2023 9:24AM - 9:36AM |
A30.00008: Effects of different rare earth elements in tuning the thermoelectric properties of RIr2Zn20 (R= rare earth) Benny c Schundelmier, Jorge R Galeano-Cabral, Keke Feng, Ryan E Baumbach, Kaya Wei Over the past several decades, the 1-2-20 class of materials has been heavily studied. The interest in these materials stems from the fact that they exhibit many exotic physical properties and are highly tunable. The 1-2-20 structure is composed of f-block elements and transition metal elements, encompassed by a large cage-like frame. In some variants, the strongly hybridized f-electron states at the Fermi level result in large Seebeck coefficient values, making this system a promising candidate for thermoelectric applications [1, 2]. In this study, we synthesized large single crystals of RIr2Zn20 (R = rare earth) using the molten metal flux growth technique. By introducing different rare earth elements, we observed a strong correlation between the f-electron states and the behavior of the temperature-dependent Seebeck coefficient. Detailed characterizations on electrical, thermal transport, and magnetic properties will be presented in order to understand such correlation and improve the overall thermoelectric properties of these materials. |
Monday, March 6, 2023 9:36AM - 9:48AM |
A30.00009: Magnetoresistance of the 2D heavy fermion system CeSiI Kierstin Torres, Victoria Posey, Xavier Roy, Philip Kim, Mehdi Rezaee The verification of the 2D electronic system and the inherent layered structure of CeSiI makes 2D transport an exciting avenue to explore the effect of dimensionality on its heavy fermion behavior. With the air sensitivity exhibited by bulk crystals, exfoliated flakes are more reactive and because of this device fabrication is extremely complex. We report electrical transport and Raman spectroscopy of atomically thin CeSiI. The temperature dependence of the resistance displays similar characteristics of the bulk single crystal measurement with an antiferromagnetic transition at ~7 K and the Kondo lattice formation at ~40 K with quadratic temperature dependance between 10 K to 25 K. The temperature dependent MR and Hall resistance exhibits sharp kinks near the metamagnetic transitions (4 - 5 T). The Hall resistance vs magnetic field also suggest a gradual formation of new transport channel with different carrier sign. Heavy fermion metals can be host of exotic quantum phenomena such as Kondo lattice, unconventional superconductivity and quantum criticality. Our study of atomically thin 2D heavy fermion system provides a new route to explore low dimensional strongly correlated systems. |
Monday, March 6, 2023 9:48AM - 10:00AM |
A30.00010: Heavy quasiparticles in CeRh2As2: Renormalized bands, Fermi surfaces, and electronic instabilities Gertrud Zwicknagl, Evrard-Ouicem Eljaouhari The heavy-fermion superconductor CeRh2As2 exhibits a rich phase diagram at low temperatures. The observation of multi-phase superconductivity has been of particular interest [1]. The present contribution deals with the low-temperature normal state out of which the superconducting phases are forming. The central focus are the narrow quasiparticle bands and the electronic instabilities of the Fermi liquid state. We present calculations of the heavy quasiparticles in the heavy-fermion compound CeRh2As2. The narrow quasiparticle bands that are derived from the Ce-4f degrees of freedom are calculated by means of the Renormalized Band (RB) method. The RB scheme provides a framework for a realistic description of the coherent low-energy excitations in a Fermi liquid which combines material-specific ab-initio methods and phenomenological considerations in the spirit of the Landau theory of Fermi liquids. The central focus of the present study is the role played by the non-symmorphic lattice structure and the consequences of the Crystalline Electric Field (CEF) which removes the orbital degeneracy of the Ce 4f states. We conjecture that the quasi-quartet CEF ground state in combination with pronounced nesting features of the Fermi surface may give rise to a quadrupole density wave [2]. |
Monday, March 6, 2023 10:00AM - 10:12AM |
A30.00011: Origin of the metal-insulator transition in the parent compounds of Ru-pnictide superconductors Niraj Aryal, Weiguo Yin, Emil S Bozin We study the interplay of the structural phase transition, flat electronic dispersion, and metal-to-insulator transition (MIT) in the parent compounds of the Ru-pnictide superconductors by using first-principles methods. Our electron and phonon calculations reveal that RuP and RuAs undergo MIT accompanied by orthorhombic to monoclinic distortion at low temperature, but RuSb stays orthorhombic and metallic, in agreement with the experimental findings. We find that although monoclinic distortion reduces the van Hove singularity at the Fermi level, a large monoclinic distortion is necessary for a clear MIT. Furthermore, we predict a light-induced two-step insulator-to-metal and structural transitions in the monoclinic phases of RuP and RuAs, which can be tested in future ultrafast pump-probe experiments. |
Monday, March 6, 2023 10:12AM - 10:24AM |
A30.00012: Signatures of insulating phases in the SU(3) symmetric Hubbard model in two dimensions Eduardo Ibarra Garcia Padilla, Ehsan Khatami, Richard T Scalettar, Kaden Hazzard In this work we study the SU(3) Fermi Hubbard model in the two-dimensional square lattice at finite temperature using determinant Quantum Monte Carlo (DQMC) as a function of temperature, interaction strength and doping. We study the evolution of the compressibility and structure factors to understand at which interaction strengths the system opens a charge gap and when it develops magnetic ordering. Our results complement previous studies in the Heisenberg limit at finite temperature and ground state calculations to elucidate the phase diagram of this model. These results provide guidance for ongoing optical lattice experiments with 173Yb or 87Sr quantum gas microscopes. |
Monday, March 6, 2023 10:24AM - 10:36AM |
A30.00013: Local four-point vertex near the Mott transition Jeongmin Shim, Jae-Mo Lihm, Johannes J Halbinger, Fabian B Kugler, Jan von Delft, Seung-Sup B. Lee We study the local four-point vertex of the Hubbard model near the Mott transition using dynamical mean-field theory (DMFT). We employ the numerical renormalization group (NRG) as impurity solver in the DMFT loop. We use NRG and symmetrized equations of motion to compute the four-point vertex in both the Matsubara and Keldysh formalisms. We analyze characteristic signatures of the Mott transition in the vertex. We also study the vertex asymptotic classes and the single-boson exchange decomposition of the four-point vertex near the Mott transition. |
Monday, March 6, 2023 10:36AM - 10:48AM |
A30.00014: How to Recognize the Universal Aspects of Mott Criticality? Yuting Tan, Vladimir Dobrosavljevic, Louk Rademaker We critically discuss several examples of two-dimensional electronic systems displaying interaction-driven metal-insulator transitions of the Mott (or Wigner-Mott) type, including dilute two-dimension electron gases (2DEG) in semiconductors, Mott organic materials, as well as the recently discovered transition-metal dichalcogenide (TMD) moiré bilayers. Remarkably similar behavior is found in all these systems, which is starting to paint a robust picture of Mott criticality. Most notably, on the metallic side, a resistivity maximum is observed whose temperature scale vanishes at the transition. We compare the available experimental data on these systems to three existing theoretical scenarios: spinon theory, Dynamical Mean Field Theory (DMFT), and percolation theory. We show that the DMFT and percolation pictures for Mott criticality can be distinguished by studying the origins of the resistivity maxima using an analysis of the dielectric response. |
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