Inhomogeneous ordering in weakly coupled Heisenberg $S=1/2$ chains with random bonds

Abstract

Long range magnetic ordering in the quasi-one-dimensional random-bond antiferromagnet BaCu${}_2$(Si${}_{1-x}$Ge${}_x$)${}_2$O${}_7$ is studied in $\mu$SR experiments as a function of disorder strength. Compared to the disorder-free parent materials, the saturation ordered moment is found to be considerably reduced. Moreover, even in weakly disordered species, the magnetically ordered state is shown to be highly inhomogeneous. The results are interpreted in terms of weakly coupled random spin chains, governed by the ``infinite randomness`` fixed point.

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Cited by in corpus (4)

• Chemical- and hydrostatic-pressure effects on the Kitaev honeycomb material Na${}_2$IrO${}_3$
• From order to randomness: Onset and evolution of the random-singlet state in bond-disordered BaCu${}_2$(Si${}_{1-x}$Ge${}_x$)${}_2$O${}_7$ spin-chain compounds
• Effect of disorder on a pressure-induced $z=1$ magnetic quantum phase transition
• Antiferromagnetic order in weakly coupled random spin chains