Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session S05: Quantum Criticality and Novel Phases in Multipolar SystemsInvited
|
Hide Abstracts |
Sponsoring Units: DCMP Chair: Meigan Aronson, Texas A&M Univ Room: LACC 152 |
Thursday, March 8, 2018 11:15AM - 11:51AM |
S05.00001: Novel phases in critical metallic systems with multipolar local moments Invited Speaker: Yong-Baek Kim I will provide a broad overview of recent theoretical and experimental developments in multipolar systems, emphasizing the new challenges posed by multipolar critical and ordered states of quantum matter. These novel quantum materials involve itinerant electrons, interacting and entangling with multipolar local moments, often on frustrated lattices. We discuss the novel phases that may arise from such interactions, especially when conduction electron system possesses a large spin-orbit coupling. Theoretical models for Pr2Ir2O7 and PrV2Al20 will be considered as concrete examples for discussion. |
Thursday, March 8, 2018 11:51AM - 12:27PM |
S05.00002: The influence of nuclear-electronic order on quantum criticality in antiferroquadrupolar PrOs4Sb12 Invited Speaker: Alix McCollam
|
Thursday, March 8, 2018 12:27PM - 1:03PM |
S05.00003: X-ray probes of orbital configurations in f-electron systems Invited Speaker: Andrea Severing The interplay of structural, orbital, charge and spin degrees of freedom is at the heart of many emergent phenomena, including superconductivity, hidden order, and unique quantum phenomena like topological insulating states. We will show that modern x-ray spectroscopy [1,2] which aim specifically at the ground state symmetry are invaluable tools for determining the occupied ground state orbital. |
Thursday, March 8, 2018 1:03PM - 1:39PM |
S05.00004: Magnetic excitations in the quadrupolar ordered CeB6. Invited Speaker: Dmytro Inosov Cerium hexaboride is a textbook example of an f-electron system hosting an exotic antiferroquadrupolar order. Even after decades of intense studies, it still lacks a complete theoretical description, and experiments continue to present puzzles in the form of unexpected observations. In recent years, we have scrutinized the magnetic excitation spectrum of CeB6 and its doped derivatives such as Ce1-xLaxB6 and Ce1-xNdxB6. In this symposium on f-electron materials, I would like to present our most recent results with a focus on magnetic-field and doping dependence of spin correlations and collective magnon excitations in these systems. We find clear signatures of long-range RKKY interactions between the f-electron multipoles in the diffuse quasielastic response in zero magnetic field that sensitively depends on charge doping. Further, field-induced collective magnon modes have been mapped out in fields up to 14.5 T applied along different crystallographic directions, revealing new high-field magnetic excitations that were not previously detected in electron spin resonance (ESR) or any other probes. I will also discuss the current progress towards the theoretical understanding of these results. |
Thursday, March 8, 2018 1:39PM - 2:15PM |
S05.00005: Emergent magnetic anisotropy in the Ce-115 compounds Invited Speaker: Filip Ronning Metals containing cerium exhibit a diverse range of fascinating phenomena including heavy fermion behavior, quantum criticality, and superconductivity, often with parallels to the physics found in other strongly correlated materials. CeRhIn5 is a prototypical example of such physics. Recently, we have investigated the parent antiferromagnetic state in an applied magnetic field to better understand the magnetism that gives rise to superconductivity under pressure. First we illustrate that the exchange interactions in heavy fermions can be strongly field dependent. We show that this physics may be understood as a consequence of the changing crystal field levels with an applied field. Since crystal field splitting in 4f materials is typically of order 10 meV we expect that field dependent exchange interactions are a general phenomenon. Combined with the presence of magnetic frustration in CeRhIn5, this field dependent exchange interaction leads to so-called ANNNI (axial next nearest neighbor Ising) physics. A consequence of this is that the magnetism is modulated in real space, with intertwined orders resulting in potentially reduced dimensional electronic states. We find precisely such a state when the magnetic field exceeds 30 T along the c-axis of the crystal. The electronic degrees of freedom dramatically break the fourfold symmetry of the lattice, with only a minor perturbing in-plane field component, suggesting an XY electronic nematic state. |
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