Dipole-Octupole Quantum Spin Liquids inCe-based Phrochlores by Bruce D. Gaulin

PROGRAM

FRUSTRATED METALS AND INSULATORS (HYBRID)

ORGANIZERS
Federico Becca (University of Trieste, Italy), Subhro Bhattacharjee (ICTS-TIFR, India), Yasir Iqbal (IIT Madras, India), Bella Lake (Helmholtz-Zentrum Berlin für Materialien und Energie, Germany), Yogesh Singh (IISER Mohali, India) and Ronny Thomale (Julius-Maximilians-Universität at Würzburg, Germany)

DATE: 05 September 2022 to 16 September 2022

VENUE: Ramanujan Lecture Hall and Online

Frustration, i.e., the intertwining of competing physical state formation tendencies, is a ubiquitous theme in contemporary condensed matter physics. While certain domains such as frustrated magnetism are more established than others, the perspective of frustration applied to correlated electron systems promises to deepen and elevate understanding of a broad set of principles such as competing orders, quantum state entanglement, and criticality. While a Mott state is often rather canonically reconciled from the viewpoint of frustration, itinerant electron systems can likewise exhibit similar features that are intimately connected to the symmetry and topology of a metal or band insulator. Our ICTS workshop “Frustrated Metals and Insulators” aims at bringing together a diverse community of condensed matter researchers to push the state of the art and extend understanding towards a synergetic foundation of frustration phenomena in metals as well as insulators. The workshop intends to facilitate the development of analytical and numerical methods to address aspects of frustration in electronic systems, and to intensify the dialogue between theoretical conceptualization and experimental realization. It will consist of a series of talks from a selective group of international experts in the fields of frustrated magnetism, superconductivity and topological states of matter. The talk format and the topical arrangement is aimed at encouraging in-depth discussions across all subareas of frustrated electron systems, and as such to enable new collaborative activities between the participants.

ICTS is committed to building an environment that is inclusive, non discriminatory and welcoming of diverse individuals. We especially encourage the participation of women and other under-represented groups.

Eligibility criteria: Applications are invited from graduate students, postdocs, and faculties with overlapping research interests. Applicants are strongly encouraged to make a contribution in the form of a poster or contributed talk, and the decision concerning the same will be communicated at a later stage. Depending upon the prevailing pandemic situation and the availability of accommodation, participation may be restricted to online mode.

CONTACT US: [email protected]
PROGRAM LINK: https://www.icts.res.in/program/frumi...

Table of Contents (powered by https://videoken.com)
0:00:00 Start
0:00:10 Dipolar - Octupolar Quantum Spin Liquids in Ce-based Pyrochlores
0:02:03 Physics of Frustration in 3D on Tetrahedron
0:04:45 Spin Ice
0:06:19 Quantum Spin Ice: A U(1) Quantum Spin Liquid
0:09:52 Polycrystalline Ce2Sn207 identified as possible 4f1 Quantum Spin Liquid
0:11:21 Pyrochlores have the quintessential lattice for the phenomena of magnetic frustration in 3D.
0:14:33 Ce2Zr207: No obvious phase transition for T 0.06 K
0:16:57 Rare Earth-based Insulators often display A separation of Energy Scales:
0:19:46 High Energy Physics: CEF excitations and Dipole-Octupole Ground State in Ce2Zr207
0:22:45 Different Types of CEF Ground State Doublets
0:24:46 Two components of Seff=1/2 for Ce3+ in Ce2Zr207 transform as Dipoles;
0:26:10 Low energy neutron scattering from Ce2Zr207
0:31:29 Polarized diffraction from single crystal Ce2Zr207 resembles classical spin ice Ho2Ti207
0:34:35 "Gold Standard" for estimating spin Hamiltonian is spin wave analysis of neutron spectroscopy, often in high field.
0:40:19 Heat Capacity and Neutron Scattering Place Ce2Zr207 within its Generalized Hamiltonian Phase Diagram
0:42:08 NLC results also give a protocol to estimate the low Cp, consistent with appropriate photons, visions and monopoles, such that S can be accounted for.
0:43:09 Young Collaborators
0:47:14 Low energy neutron scattering from Ce2Zr207
0:50:51 Heat Capacity and Neutron Scattering Place Ce2Zr207 within its Generalized Hamiltonian Phase Diagram
0:53:03 Q&A