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 K56: Kagome Materials
3:00 PM–5:48 PM,
Tuesday, March 7, 2023
Room: Room 304
Sponsoring
Unit:
GMAG
Chair: Keith Taddei, Oak Ridge National Lab
Abstract: K56.00001 : Chemical control of magnetism in the Kagome metal CoSn1-xInx: Magnetic order from nonmagnetic substitutions*
3:00 PM–3:12 PM
Presenter:
Brian C Sales
(OAK RIDGE NATIONAL LABORATORY)
Authors:
Brian C Sales
(OAK RIDGE NATIONAL LABORATORY)
William R Meier
(University of Tennessee)
David S Parker
(Oak Ridge National Laboratory)
Li Yin
(Oak Ridge National Lab)
Jiaqiang Yan
(Oak Ridge National Laboratory)
Andrew F May
(Oak Ridge National Lab)
Stuart Calder
(OAK RIDGE NATIONAL LABORATORY)
Adam A Aczel
(Oak Ridge Nat'l Lab)
Qiang Zhang
(OAK RIDGE NATIONAL LABORATORY)
Haoxiang Li
(OAK RIDGE NATIONAL LABORATORY)
Turgut Yilmaz
(Brookhaven National Laboratory)
Elio Vescovo
(Brookhaven National Lab)
Hu Miao
(OAK RIDGE NATIONAL LABORATORY)
Duncan H Moseley
(Oak Ridge National Lab)
Raphael P Hermann
(Oak Ridge National Lab)
Michael A McGuire
(Oak Ridge National Lab)
large density of states near the Fermi energy. When the Fermi energy is positioned within these
bands large electronic instabilities can result. For the Kagome metal, CoSn, this alignment is not
realized and the flat bands are completely filled. We demonstrate that replacing Sn with In
moves the flat bands into the Fermi energy, as expected from simple electron counting. This is
supported by band structure calculations, heat capacity measurements, and angle-resolved
photoemission spectroscopy. The increased density of states results in the emergence of
antiferromagnetic order as evidenced in magnetic susceptibility, Mossbauer spectroscopy and
neutron diffraction data. The Neel temperature reaches a maximum of 32 K for x = 0.4.
Emergence of magnetic order when doping a non-magnetic element, In, into a non-magnetic
Kagome metal is striking. This work provides clear evidence that flat bands from electronically
frustrated lattices in bulk crystals provide a new and powerful way to realize correlated ground
states controlled by crystal chemistry. The effects of hole doping with Fe or Ga will be discussed
as well.
*This research was supported by the U.S. Department of Energy, Office of Science, Basic EnergySciences, Materials Sciences and Engineering Division.
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