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Quantum disordered state in the J1-J2 square-lattice antiferromagnet Sr2Cu(Te0.95 W0.05) O6
- Authors
- Yoon, S.; Lee, W.; Lee, S.; Park, J.; Lee, C.H.; Choi, Y.S.; Do, S.-H.; Choi, W.-J.; Chen, W.-T.; Chou, F.; Gorbunov, D.I.; Oshima, Y.; Ali, A.; Singh, Y.; Berlie, A.; Watanabe, I.; Choi, K.-Y.
- Issue Date
- 2021
- Publisher
- American Physical Society
- Citation
- Physical Review Materials, v.5, no.1
- Journal Title
- Physical Review Materials
- Volume
- 5
- Number
- 1
- ISSN
- 2475-9953
- Abstract
- The B-site ordered double perovskites Sr2Cu(Te1-xWx)O6 provide an excellent arena for investigating exotic phases expected for the J1-J2 square-lattice Heisenberg antiferromagnet. Here, combining magnetic susceptibility and specific-heat measurements with electron spin resonance (ESR) and muon spin rotation/relaxation (μSR) techniques, we explore a spin-liquid-like state in the vicinity of the Néel critical end point (x=0.05-0.1). The specific heat and the ESR and muon relaxation rates give evidence for an energy hierarchy of low-energy excitations, reminiscent of randomness-induced singlet states. In addition, the weak transverse μSR data show a fraction of frozen magnetic moments in the random-singlet background. The origin of a random-singlet-like state near the phase boundary is discussed in terms of concomitant exchange randomness and local strain generated by the W6+-for-Te6+ substitution. © 2021 American Physical Society.
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