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Title: Unconventional magnetic oscillations in a kagome Mott insulator

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
ORCiD logo [1];  [1];  [1];  [2]; ORCiD logo [1]; ORCiD logo [1];  [1];  [3];  [3];  [4];  [4]; ORCiD logo [4];  [5]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
  4. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  5. Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Guangdong (China)
+ Show Author Affiliations

In metals, electrons in a magnetic field undergo cyclotron motion, leading to oscillations in physical properties called quantum oscillations. This phenomenon has never been seen in a robust insulator because there are no mobile electrons. We report an exception to this rule. We study a Mott insulator on a kagome lattice which does not order magnetically down to milli-Kelvin temperatures despite antiferromagnetic interactions. We observe a plateau at magnetization equal to $$\frac{1}{9}$$ Bohr magneton per magnetic ion, accompanied by oscillations in the magnetic torque, reminiscent of quantum oscillations in metals. The temperature dependence obeys Fermi distribution. These phenomena are consistent with a quantum spin liquid state whose excitations are fermionic spinons with a Dirac-like spectrum coupled to an emergent gauge field.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
89233218CNA000001; FG02-03ER46076; SC0020184
OSTI ID:
2584679
Report Number(s):
LA-UR--23-31740; 1091-6490; 10.1073/pnas.2421390122
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 5 Vol. 122; ISSN 1091-6490; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
magnetization plateau
quantum oscillations
quantum spin liquid