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Authors: Arnab Sen (Tata Institute of Fundamental Research, 1, Homi Bhabha Road, Mumbai 400005, India & Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA) Kedar Damle (Tata Institute of Fundamental Research, 1, Homi Bhabha Road, Mumbai 400005, India) Roderich Moessner (Max-Planck-Institut fur Physik komplexer Systeme, 01187 Dresden, Germany) Some of the most intricately correlated collective states of matter appear deceptively featureless in their ground state properties. Their excitations, however, can reveal much more of the underlying correlations and complexity. Here we consider the archetypal frustrated antiferromagnet SrCr9pGa12-9pO19 in its well-known `Coulomb' spin-liquid state, and demonstrate that a Cr3+ S=3/2 spin 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 texture leaves an unmistakable imprint of this fractionalized degree of freedom on the measured 71Ga nuclear magnetic resonance (NMR) lineshapes.} |
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