Characterizing random-singlet state in two-dimensional frustrated quantum magnets and implications for the double perovskite Sr 2 CuTe 1 – x W x O 6
Journal Article
·
· Physical Review. B
- Beihang University, Beijing (China); Tsinghua University, Beijing (China); CSUN
- Beihang University, Beijing (China)
- Sun Yat-Sen University, Guangzhou (China)
- California State University, Northridge (CSUN), CA (United States)
Motivated by the experimental observation of a nonmagnetic phase in compounds with frustration and disorder, we study the ground state of a spin-1/2 square-lattice Heisenberg model with randomly distributed nearest-neighbor J1 and next-nearest-neighbor J2 couplings. By using the density matrix renormalization group (DMRG) calculation on a cylinder system with a circumference of up to ten lattice sites, we identify a disordered phase between the Néel and stripe magnetic phase with growing J2/J1 in the presence of strong bond randomness. The vanished spin-freezing parameter indicates the absence of spin-glass order. The large-scale DMRG results unveil the size-scaling behaviors of the spin-freezing parameter, the power-law decay of the average spin correlation, and the exponential decay of the typical spin correlation, which all agree with the corresponding behavior in the one-dimensional random-singlet (RS) state and characterize the RS nature of this disordered phase. The DMRG simulation also provides insights and opportunities for characterizing a class of nonmagnetic states in two-dimensional frustrated magnets with disorder. Here, we also compare with existing experiments and suggest more measurements for understanding the spin-liquid-like behaviors in the double perovskite Sr2CuTe1–xWxO6.
- Research Organization:
- California State University, Northridge (CSUN), CA (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- FG02-06ER46305
- OSTI ID:
- 2203462
- Alternate ID(s):
- OSTI ID: 1910273
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 107; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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