Fractional spin textures in the frustrated magnet SrCr$_{9p}$Ga$_{12-9p}$O$_{19}$

Arnab Sen; Kedar Damle; Roderich Moessner

doi:10.1103/PhysRevLett.106.127203

paper

Fractional spin textures in the frustrated magnet SrCr $_{9 p}$ Ga $_{12 - 9 p}$ O $_{19}$

arXiv:1007.4507 · doi:10.1103/PhysRevLett.106.127203

Abstract

We consider the archetypal frustrated antiferromagnet SrCr $_{9 p}$ Ga $_{12 - 9 p}$ O $_{19}$ in its well-known spin-liquid state, and demonstrate that a Cr $^{3 +}$ spin $S = 3/2$ ion in direct proximity to a pair of vacancies (in disordered $p < 1$ samples) is cloaked by a spatially extended spin texture that encodes the correlations of the parent spin-liquid. In this spin-liquid regime, the combined object has a magnetic response identical to a classical spin of length $S /2 = 3/4$ , which dominates over the small intrinsic susceptibility of the pure system. This fractional-spin texture leaves an unmistakable imprint on the measured $^{71}$ Ga nuclear magnetic resonance (NMR) lineshapes, which we compute using Monte-Carlo simulations and compare with experimental data.

4 pages, 2-column format, 3 color figures

References in corpus (1)

First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase

Fractional spin textures in the frustrated magnet SrCr9p​Ga12−9p​O19​

Abstract

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Fractional spin textures in the frustrated magnet SrCr $_{9 p}$ Ga $_{12 - 9 p}$ O $_{19}$