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Title: 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
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [2]
  1. Beihang University, Beijing (China); Tsinghua University, Beijing (China)
  2. Beihang University, Beijing (China)
  3. Sun Yat-Sen University, Guangzhou (China)
  4. 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:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
FG02-06ER46305; 11874078; 11834014; 11804401
OSTI ID:
2203462
Alternate ID(s):
OSTI ID: 1910273
Journal Information:
Physical Review. B, Vol. 107, Issue 2; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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