Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.127203
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Funding
- DST [SR/S2/RJN-25/2006]
- Fell Fund (Oxford)
- ICTS TIFR (Mumbai)
- ARCUS (Orsay)
- MPIPKS (Dresden)
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We consider the archetypal frustrated antiferromagnet SrCr9pGa12-9pO19 in its well-known spin-liquid state, and demonstrate that a Cr3+ 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, our analytic theory predicts that 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 Ga-71 nuclear magnetic resonance line shapes, which we compute using Monte Carlo simulations and compare with experimental data.
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