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Out-of-plane magnetic phase diagram of the Kitaev quantum magnet Na 2 Co 2 TeO 6

Journal Article · · Physical Review. B
 [1];  [1];  [1];  [2];  [2];  [1];  [1]
  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
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We have investigated the magnetic properties and mapped out the phase diagram of the honeycomb magnet Na2⁢Co2⁢TeO6 with Co 3d7 in out-of-plane magnetic fields. This material has previously been proposed to show nearest-neighbor Kitaev interactions between Co spins and maybe even Kitaev quantum spin liquid behavior in high fields. At 0.01 T, we observe a thermal phase transition at TN = 27K, transitioning from a paramagnetic state to a canonical ferrimagnetic state. Upon increasing the magnetic field, a spin-floplike phase transition occurred before saturation of J = 1/2 between 10 K and TN. Below 10 K, a peak-dip-peak structure emerges between 10 and 17 T in the magnetic susceptibility (d⁢M/⁢dH) before the magnetic saturation, reminiscent of magnetization plateau behavior. The measurement of the magnetocaloric effect also shows dip-peak-dip behavior in this field range. Our data can be explained by an XXZ model with a single ion anisotropy and possibly small Kitaev and Γ exchange interactions. Finally, we also determined the magnetization saturation field that helps constrain the energy scale of the exchange interactions.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); National Quantum Information Science (QIS) Research Centers (United States). The Quantum Science Center (QSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2475576
Alternate ID(s):
OSTI ID: 2474577
Report Number(s):
LA-UR--24-24990
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 110; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
High Magnetic Field Science
Kitaev model
Quantum Information Science and Technology
high magnetic fields
magnetization measurements
magnetocaloric effect
phase diagrams
quantum spin liquid