Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session A24: Matter at Extreme Conditions: Novel Phenomena at High PressuresFocus Recordings Available
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Sponsoring Units: GSCCM Chair: Margaret Huff, University of Rochester Room: McCormick Place W-186C |
Monday, March 14, 2022 8:00AM - 8:36AM |
A24.00001: High-pressure synthesis and magnetic and electrical properties of A- and B-site ordered quadruple perovskites Invited Speaker: Zhehong Liu Perovskite shows flexible crystal structures as well as various charge and ionic combinations, giving rise to many interesting physical properties. At present, perovskite is one of the most intriguing systems in condensed matter physics. In this talk, we will introduce a few both A-site and B-site ordered quadruple perovskite oxides synthesized by high pressure and high temperature techniques. In particular, we show that PbCoO3 with a peculiar charge combination of Pb2+Pb4+3Co2+2Co3+2O12 exhibits spin state, charge state, crystal structure, and metal-insulator transitions under high pressure. Others like CaCu3Co2Re2O12 and LaCu3Co2Re2O12, show exotic magnetic and electrical properties. Specifically, CaCu3Co2Re2O12, a strong insulator, possesses antiferromagnetic ordering at A-site and ferrimagnetic ordering at B-site. If Ca is replaced by La, ferrimagnetic half metallicity is observed in LaCu3Co2Re2O12. |
Monday, March 14, 2022 8:36AM - 8:48AM |
A24.00002: Synthesis of High-Entropy Transition Metal Borides and their Compression Behavior at High Temperatures* Seth Iwan, Yogesh K Vohra, Ross Hrubiak, Guoyin Shen High-entropy materials containing a mixture of five or more elemental species represent a paradigm shift in materials science where a variety of alloys, oxides, carbides, nitrides, and borides can be synthesized with superior physical and mechanical properties than are accessible from the constituent materials. We report on the high-pressure high-temperature synthesis of high-entropy transition metal borides and thermal equation of state measurements to 9.5 GPa and 2273 K at beamline 16-BM-B, HPCAT, Advanced Photon Source, Argonne National Laboratory. High-entropy material (Hf0.2 Ti0.2 Nb0.2 Ta0.2 Mo0.2)B2 was synthesized starting from ball-milled oxide precursors of constituent metals mixed with graphite and boron-carbide. The synthesized material crystalized in hexagonal AlB2 structure which remained stable to the highest pressure and temperature achieved in this study. Microstructural and nanoindentation hardness data was obtained from measurements on the recovered sample and thermal expansion data was obtained from the equation of state studies at high temperatures. High shear strength and phase stability under high-pressure high-temperature conditions make these materials ideal for extreme environments. |
Monday, March 14, 2022 8:48AM - 9:00AM |
A24.00003: The electron localization and the corresponding chemical interactions that govern the structures of elemental metals Maosheng Miao, Yuanhui Sun, Lei Zhao, Yonghao Zheng Elemental metals are the simplest solid form of matter, and yet their structure variations across the periodic table and under pressure remain puzzling for many decades. They adopt and transform between very simple structures in an intriguing pattern under zero and high compressions. While most transition metals are only found in simple structures so far, the “simple” alkali and alkaline earth metals may transform into complicated structures under high pressure. Despite that quantum mechanics calculations can reproduce and/or predict most of the metal structures and many aspects of the electronic structures have been applied to explain the results, we do not know a simple, real-space, and universal mechanism that directly elucidates all the structure patterns and evolutions. Here, by employing large-scale high-throughput calculations, we demonstrate a surprisingly simple and all-embracing theory that emerges after replacing the orthodox metallic bond concept with a new perspective emphasizing the electron localizations at the interstitials. The success of this exceedingly simple and universal mechanism demonstrates that intricate chemistry resides in metals and governs their fundamental properties, and the chemical interactions of localized electrons inside metals are necessary additions to the current chemical bond theory of metals and solid states. |
Monday, March 14, 2022 9:00AM - 9:12AM |
A24.00004: Cesium-involved electron transfer and electron-electron interaction in high-pressure metallic CsPbI3 Feng Ke, Jiejuan Yan, Shanyuan Niu, Jiajia Wen, Nathan R Wolf, Hemamala I Karunadasa, Young S Lee, Wendy L Mao, Yu Lin The rich electronic properties realized in perovskite oxides have motivated the search for novel electronic states in isostructural halide perovskites and related lattice architectures. By compressing δ-CsPbI3 to 80 GPa, an insulator-to-metal transition occurs, concomitant with the completion of a sluggish structural transition from the one-dimensional (1D) Pnma (δ) phase to a 3D Pmn21 (ε) phase. Deviation from Fermi liquid (FL) behavior is observed in CsPbI3 upon entering the metallic ε phase, which progressively evolves into a FL-like state at 186 GPa. First-principles density functional theory calculations reveal dramatically enhanced electron transfer and sudden increase of the 5d state occupation of Cs and I in the ε phase that strengthen the electron-electron interaction and render FL-like behavior. Our study presents a promising strategy for tuning the electronic interaction in halide perovskites for realizing intriguing electronic states. |
Monday, March 14, 2022 9:12AM - 9:24AM |
A24.00005: Electronic structure effects of the anharmonic modes of FeV at high pressure. Homero Reyes Pulido, Jorge A Munoz Classical molecular dynamics methods can describe accurately a broad set of many-atom systems. Although more economic, the results given by this framework lack the precision that density functional theory (DFT) is capable of. We analyze the dynamical stability of the B2 phase of the equiatomic iron-vanadium (FeV) alloy using DFT to verify and further explain recent results obtained by our group that show the behavior of the transverse acoustic (TA) M5 phonon modes and several others to be highly anharmonic and sensitive to temperature. The degenerate TA M5 modes in particular are destabilized by pressure but stabilized by temperature. The band structure, the electronic density of states (eDOS) and the phonon dispersion relations at 0 K and at finite atomic displacements corresponding to 300 K temperature were computed. The finite-temperature phonon dispersion relations are calculated fitting the effective force constants model with the Born-von-Karman model up to the fifth nearest neighbors. The magnetization disappears with temperature, and we investigate how the charge transfer between orbitals might be responsible for the anharmonic behavior of the phonons. |
Monday, March 14, 2022 9:24AM - 9:36AM |
A24.00006: Structural, optical, and electrical properties of multiferroic GeV4S8 under high pressure Yuejian Wang, Zhiwei Sheng, Dongzhou Zhang, Lin Wang, Vladimir Tsurkan, Alois Loidl Lacunar spinels, AM4X8 (A=Ga or Ge; M=V, Mo, Nb, or Ta; X=S or Se), constitute a distinct category of ternary chalcogenide compounds. One member in this category, GeV4S8, has attracted considerable attention because of its unique transport and magnetic properties. Previously and even in the recent, majority of the studies focused on the cooling effect on this material. Another approach, compression or high pressure, can cleanly tune and explore holistically the material's characteristics, but the investigation of GeV4S8 by using a high-pressure technique is rather scarce in the literature. In the present research, we utilized a diamond anvil cell integrated with high energy synchrotron x-ray diffraction, Raman spectroscopy, four-point probes to comprehensively characterize this material in terms of crystal structural transformation and conductivity variation induced by the compression. We tried to elucidate the mechanisms behind the phase transitions by Jahn-teller effect and the anisotropic changes in atomic configuration under high-pressure conditions. |
Monday, March 14, 2022 9:36AM - 9:48AM |
A24.00007: X-ray studies on the structure and magnetism of the honeycomb cobaltate Na3Co2SbO6 under pressure. Eduardo H Poldi, Ravhi S Kumar, Dmitry Popov, Gilberto F Fabbris, Jiaqiang Yan, John F Mitchell, Daniel Haskel, Russell J Hemley The layered, honeycomb Na3Co2SbO6 material features Co2+ ions in trigonally distorted (Δ ∼ 40 meV) edge-shared octahedra [1,2]. The pseudospin-1/2 state of Co2+ ions together with edge-shared octahedra introduces Kitaev interactions, and it is predicted [3] that tuning Δ under isotropic compression or uniaxial strain would drive a transition from antiferromagnetically ordered to a spin liquid phase. We conducted X-ray diffraction and X-ray magnetic circular dichroism (XMCD) experiments as a function of hydrostatic pressure in a diamond anvil cell to explore the evolution of Na3Co2SbO6 structure and magnetism. Preliminary results from powder diffraction show no phase transitions up to 70 GPa. Co K-edge XMCD measurements show a robust magnetic ordering up to at least 36 GPa, with an increase in the magnetic ordering temperature with pressure. Higher hydrostatic pressures, or application of uniaxial strain in single crystalline samples, would be needed to sufficiently suppress the trigonal distortion in order to reach the postulated spin liquid phase. |
Monday, March 14, 2022 9:48AM - 10:00AM |
A24.00008: Pressure Dependence of Acoustic Properties in Glycerol by Brillouin Scattering Cade M Vallero, Muhetaer Aihaiti, Sergey N Tkachev, Stella Chariton, Vitali Prakapenka, Seiji Kojima, Russell J Hemley Glycerol, a glass-forming fluid, is widely used in research and laboratory settings as a cryoprotectant. We employed high-pressure Brillouin scattering to study the pressure dependencies of longitudinal and transverse acoustic modes of glycerol up to 14 GPa in diamond anvil cells. We observed the transverse acoustic mode which has been unobserved in previous experiments. Our results allow us to derive values for a complete set of elastic properties for glycerol in this pressure range, as well as its density-pressure equation of state. In addition, we performed direct measurements of the pressure-volume equation of state from the sample thickness and area. Our results further allow us to quantify the pressure dependence of γ, the ratio of the adiabatic to the isothermal bulk modulus. |
Monday, March 14, 2022 10:00AM - 10:12AM |
A24.00009: Heat leaks and noise in microkelvin electronics on a pulse-tube cryostat Mohammad Samani, Christian P Scheller, Nikolai Yurttagül, Kestutis Grigoras, David Gunnarsson, Omid Sharifi Sedeh, Alexander T Jones, Jonathan R Prance, Richard Haley, Mika Prunnila, Dominik M Zumbuhl On-chip microkelvin temperatures hold the potential to explore new physics with small energy scales such as novel quantum states and would open the door to unprecedented quantum coherence. In this work, we use on-and-off chip adiabatic nuclear refrigeration on a pulse-tube cryostat to cool metallic coulomb blockade thermometers deep into the microkelvin regime. We obtain temperatures as low as 224±7 μK, remaining below 300 μK for 27 hours [Samani et al. arXiv:2110.06293 (2021)], thus providing sufficient time for measurements. Dry dilution refrigerators have grown enormously in popularity due to their vast experimental space and independence of helium, but their unavoidable vibrations are making microkelvin cooling very difficult. Here, we investigate the heat leak onto a Coulomb blockade thermometer as a function of the external magnetic field. Furthermore, the role of electronic noise is explored, which is limiting the current temperature reading. Finally, we propose improvements allowing to cool below 50 μK for a new generation of microkelvin experiments. |
Monday, March 14, 2022 10:12AM - 10:24AM |
A24.00010: High-pressure evolution of structural distortions in perovskites: A comparative RFeO3 vs RMnO3 study Rui Vilarinho, Mael Guennou, Pierre Bouvier, Mads Weber, Inmaculada Peral, Pedro Tavares, Gaston Garbarino, Mohamed Mezouar, Jens Kreisel, Abilio Almeida, Joaquim Agostinho Moreira The physical properties of perovskite materials, with general formula ABO3, are known to be strongly dependent on their structural distortions, which can be changed through temperature, applied electric/magnetic fields, and epitaxial strain. The understanding of the delicate energy balance involving the different structural instabilities is therefore a key point for the design of multifunctional perovskite-based materials. Hydrostatic pressure allows modifying the interatomic distances and tune the interactions to a much larger extent than any other external parameters. |
Monday, March 14, 2022 10:24AM - 10:36AM |
A24.00011: Pressure-induced Tc enhancement and insulator-metal transition in a nodal-line ferrimagnet Mn3Si2Te6 Resta A Susilo, Yoonhan Lee, Nilesh P Salke, CHANDAN DE, Junho Seo, Russell J Hemley, Sang-Wook Cheong, Duckyoung Kim, Kyoo Kim, Kee H Kim, Jun Sung Kim, Dean Smith Ferrimagnetic semiconductor Mn3Si2Te6 is recently reported to show colossal angular magnetoresistance (CAMR), which is related to the insulator-to-metal transition driven by the tunable spin-orbit coupling gap with spin orientation [1]. Here we report our investigation on high pressure effect on Mn3Si2Te6 using electrical transport, magnetization, and synchrotron X-ray diffraction (XRD). Upon increasing pressure, the resistivity systematically decreases, leading to an insulator-to-metal transition (IMT) at Pc ~15 GPa, with the CAMR is also being continuously weakened. On the other hand, the Curie temperature (Tc) is unusually enhanced from Tc = 78 K reaching up to nearly room temperature at Pc, above which it decreases in the metallic state. The Tc enhancement occurs in the same initial crystal structure while the IMT is accompanied by the possible structural transformation. The underlying mechanism of the metal-insulator transition and Tc enhancement in terms of the competition of intra- and interlayer couplings at high pressures will be discussed. |
Monday, March 14, 2022 10:36AM - 10:48AM |
A24.00012: Mikrokelvin electronics on a pulse-tube cryostat with a gate Coulomb blockade thermometer Christian P Scheller, Mohammad Samani, Nikolai Yurttagul, Kestutis Grigoras, David Gunnarsson, Omid S Sedeh, Alexander T Jones, Jonathan R Prance, Richard Haley, Mika Prunnila, Dominik M Zumbuhl Access to lower temperatures has consistently enabled scientific breakthroughs. On-chip microkelvin temperatures would open the door to unprecedented quantum coherence, novel quantum states of matter, and also the discovery of unexpected phenomena. Adiabatic demagnetization is the workhorse of microkelvin cooling, requiring a dilution refrigerator precooling stage. Pulse-tube dilution refrigerators have grown enormously in popularity due to their vast experimental space and independence of helium, but their unavoidable vibrations are making microkelvin cooling very difficult. On-chip thermometry in this unexplored territory is also not a trivial task due to extreme sensitivity to noise and heat leaks. Here, we present a pulse-tube compatible microkelvin sample holder with on-board cooling and microwave filtering and introduce a new type of temperature sensor, the gate Coulomb blockade thermometer, working deep into the microkelvin regime. Using on- and off-chip cooling, we demonstrate electronic temperatures as low as 224±7 μK, remaining below 300 μK for 27 hours [Samani et al. arXiv:2110.06293 (2021)], thus providing sufficient time for measurements. |
Monday, March 14, 2022 10:48AM - 11:00AM |
A24.00013: Structural evolution under pressure in single-crystal layered antiferromagnets MPS3 (M=Fe, Ni, Mn) David M Jarvis, Matthew J Coak, Shiyu Deng, Charles S Haines, Hayrullo H Hamidov, Giulio I Lampronti, Cheng Liu, Andrew R Wildes, Siddharth S Saxena The family of layered antiferromagnetic insulators MPS3, where M is a first row transition metal, have been previously found to undergo structural transitions under pressure which have been linked to a range of behaviours including metallisation and the emergence of superconductivity or new magnetic states[1-2]. The majority of published structural characterisations of these quasi-two-dimensional compounds rely on measurements of powder samples, whereas transport and magnetic properties are mostly derived from bulk single crystals. |
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