Dynamical ground state in the XY pyrochlore Yb2GaSbO7

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作者：
P. M. Sarte
K. Cruz-Kan
B. R. Ortiz
K. H. Hong
M. M. Bordelon
D. Reig-i-Plessis
M. Lee
E. S. Choi
M. B. Stone
S. Calder
D. M. Pajerowski
L. Mangin-Thro
Y. Qiu
J. P. Attfield
S. D. Wilson
C. Stock
H. D. Zhou
A. M. Hallas
J. A. M. Paddison
A. A. Aczel
C. R. Wiebe
机构：
[1] University of California,California NanoSystems Institute
[2] University of California,Materials Department
[3] University of Edinburgh,School of Chemistry
[4] University of Edinburgh,Centre for Science at Extreme Conditions
[5] University of Winnipeg,Department of Chemistry
[6] University of British Columbia,Department of Physics and Astronomy
[7] University of British Columbia,Stewart Blusson Quantum Matter Institute
[8] Florida State University,Department of Physics
[9] Florida State University,National High Magnetic Field Laboratory
[10] Los Alamos National Laboratory,National High Magnetic Field Laboratory
[11] Oak Ridge National Laboratory,Neutron Scattering Division
[12] Institut Laue-Langevin,School of Physics and Astronomy
[13] NIST Center for Neutron Research,Department of Physics and Astronomy
[14] University of Edinburgh,Materials Science and Technology Division
[15] University of TN,undefined
[16] Oak Ridge National Laboratory,undefined
来源：
npj Quantum Materials | / 6卷
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摘要：
The magnetic ground state of the pyrochlore Yb2GaSbO7 has not been established. The persistent spin fluctuations observed by muon spin-relaxation measurements at low temperatures have not been adequately explained for this material using existing theories for quantum magnetism. Here we report on the synthesis and characterisation of Yb2GaSbO7 to revisit the nature of the magnetic ground state. Through DC and AC magnetic susceptibility, heat capacity, and neutron scattering experiments, we observe evidence for a dynamical ground state that makes Yb2GaSbO7 a promising candidate for disorder-induced spin-liquid or spin-singlet behaviour. This state is quite fragile, being tuned to a splayed ferromagnet in a modest magnetic field μ0Hc ~ 1.5 T.
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