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Title: Anticollinear order and degeneracy lifting in square lattice antiferromagnet LaSrCrO4

Journal Article · · Physical Review. B
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4];  [5];  [5]; ORCiD logo [6]; ORCiD logo [4]; ORCiD logo [7];  [8]; ORCiD logo [9]
  1. Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
  2. Memorial Univ., St. Johns, NL (Canada)
  3. Univ. of Sherbrooke, QC (Canada)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of Tennessee, Knoxville, TN (United States)
  6. Chinese Academy of Sciences (CAS), Beijing (China)
  7. Georgia Institute of Technology, Atlanta, GA (United States)
  8. Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Guangdong (China)
  9. Chinese Academy of Sciences (CAS), Beijing (China); Georgia Institute of Technology, Atlanta, GA (United States)
+ Show Author Affiliations

In this work, we report the static and dynamic magnetic properties of LaSrCrO4, a seemingly canonical spin-3/2 square-lattice antiferromagnet that exhibits frustration between magnetic layers—owing to their AB stacking—and offers a rare testbed to investigate accidental-degeneracy lifting in magnetism. Neutron diffraction experiments on single-crystal samples uncover a remarkable anticollinear magnetic order below TN = 170 K characterized by a Néel arrangement of the spins within each layer and an orthogonal arrangement between adjacent layers. To understand the origin of this unusual magnetic structure, we analyze the spin-wave excitation spectrum by means of inelastic neutron scattering and bulk measurements. A spectral gap of 0.5 meV, along with a spin-flop transition at 3.2 T, reflect the energy scale associated with the degeneracy-lifting. A minimal model to explain these observations requires both a positive biquadratic interlayer exchange and dipolar interactions, both of which are on the order of 10–4 meV, only a few parts per million of the dominant exchange interaction J1≈11 meV. These results provide direct evidence for the selection of a noncollinear magnetic structure by the combined effect of two distinct degeneracy lifting interactions.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Chinese Academy of Sciences; Ministry of Science and Technology; National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725; SC0018660
OSTI ID:
1883902
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 18 Vol. 105; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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