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Quantum disordered state in the J(1)-J(2) square-lattice antiferromagnet Sr2Cu(Te0.95W0.05)O-6
- Quantum disordered state in the J(1)-J(2) square-lattice antiferromagnet Sr2Cu(Te0.95W0.05)O-6
- Yoon, Sungwon; Lee, Wonjun; Lee, S.; Park, J.; Lee, C. H.; Choi, Y. S.; Do, S-H; Choi, Woojae; Chen, Wei-Tin; Chou, Fangcheng; Gorbunov, D., I; Oshima, Yugo; Ali, Anzar; Singh, Yogesh; Berlie, Adam; Watanabe, I; Choi, Kwang-Yong
- Issue Date
- Physical Review Materials, 5(1), 014411
- Article Type
- 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.
- American Physical Society
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