Valence-Bond-Glass State with Singlet Gap in the Spin-1/2 Square-Lattice Random $J_1$-$J_2$ Heisenberg Antiferromagnet Sr${}_2$CuTe${}_{1-x}$W${}_x$O${}_6$

Abstract

The double-perovskite compounds Sr${}_2$CuTeO${}_6$ and Sr${}_2$CuWO${}_6$ are magnetically described as quasi-two-dimensional spin-1/2 square-lattice $J_1-J_2$ Heisenberg antiferromagnets with predominant $J_1$ and $J_2$ exchange interactions, respectively. We report the low-temperature magnetic properties of Sr${}_2$CuTe${}_{1-x}$W${}_x$O${}_6$ with randomness in the magnitudes of $J_1$ and $J_2$. It was found that the low-temperature specific heat for $0.1\le x\le 0.5$ has a large component proportional to the temperature $T$ above 1.2 K, although the low-temperature specific heat for the two parent systems is approximately proportional to $T^3$. With decreasing temperature below 1.2 K, the $T$-linear component decreases rapidly toward zero, which is insensitive to the magnetic field up to 9 T. This is suggestive of the singlet excitation decoupled from the magnetic field. The NMR spectrum for $x=0.2$ exhibits no long-range order down to 1.8 K. These results indicates that the ground state of Sr${}_2$CuTe${}_{1-x}$W${}_x$O${}_6$ is a valence-bond-glass state with singlet gaps.

arXiv comment6 pages, 5 figures

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