Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session RR03: V: Frustrated Magnetism
11:30 AM–1:30 PM,
Tuesday, March 21, 2023
Room: Virtual Room 3
Sponsoring
Unit:
GMAG
Chair: Yishu Wang, Johns Hopkins University
Abstract: RR03.00001 : Magnetic fragmentation in pyrochlores*
11:30 AM–12:06 PM
Presenter:
Virginie Simonet
(Institut Neel, Univ. Grenoble)
Authors:
Virginie Simonet
(Institut Neel, Univ. Grenoble)
Elsa Lhotel
(CNRS Institut Néel)
Flavien Museur
(Institut Néel)
Julien Robert
(Institut Néel, CNRS, Grenoble France)
Rafik Ballou
(Institut Néel, CNRS, Grenoble, France)
Peter Holdsworth
(ENS, Lyon, France)
Collaboration:
E. Lefrançois, V. Cathelin, P. Lejay, C.V. Colin, B. Canals, F. Damay, J. Ollivier, B. Fa°k, E. Pachoud, D. Prabhakaran, L.C. Chapon
Pyrochlore iridates of formula R2Ir2O7 with two interpenetrating pyrochlore lattices (corner-sharing tetrahedra) filled with a rare-earth R3+ and a magnetic metal Ir4+ are interesting materials in the field of frustrated magnetism. The iridium sublattice indeed orders at rather high temperature (~100 K) in an antiferromagnetic configuration called all-in all-out and imposes in turn an all-in all-out staggered effective magnetic field on the rare-earth pyrochlore lattice. This leads to the stabilization of new phases. For example, an exotic fragmented state of monopole crystal [1], where order and disorder coexist, is evidenced in Ho2Ir2O7 [2] and Dy2Ir2O7 [3]. In this new state of matter, the magnetic moment fragments into an antiferromagnetic ordered part and a persistently fluctuating Coulomb phase. This state has been studied through experimental and theoretical approach and I will detail the results obtained on both Ho and Dy compounds. I will also address the changes of the ground state observed when Ru4+, another magnetic metal ion, is substituted to the iridium in the Ho based pyrochlore. We propose a novel kind of fragmentation in this Ru based system.
[1] M. E. Brooks-Bartlett, S. T. Banks, L. D. C. Jaubert, A. Harman-Clarke, P. C. W. Holdsworth, Magnetic-moment fragmentation and monopole crystallization. Phys. Rev. X 4, 011007 (2014).
[2] E. Lefrançois, V. Cathelin, E. Lhotel, J. Robert, P. Lejay, C.V. Colin, B. Canals, F. Damay, J. Ollivier, B. Fa°k, L.C. Chapon, R. Ballou, V. Simonet, Magnetic charge injection in spin ice: a new way to fragmentation", Nature Communications 8, 209 (2017).
[3] V. Cathelin, E. Lefrançois, J. Robert, P. C. Guruciaga, C. Paulsen, D. Prabhakaran, P. Lejay, F. Damay, J. Ollivier, B. Fa°k, L. C. Chapon, R. Ballou, V. Simonet, P. C. W. Holdsworth, and E. Lhotel, Magnetic fragmentation in Dy pyrochlore iridate, Phys. Rev. Research Rapid Com. 2, 032073(R) (2020).
*Agence Nationale de la Recherche" under Grant No. ANR-19-CE30-0040.
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