Discovery of BKT correlations in the quantum kagome compound Cs$_2$Cu$_3$SnF$_{12}$

We investigate the microscopic properties of the kagome compound Cs $_{2}$ Cu $_{3}$ SnF $_{12}$ using $^{63, 65}$ Cu nuclear quadrupolar resonance (NQR). Analysis of the local hyperfine fields below the Néel temperature $T_{N} = 20$ K indicates a spin structure consistent with $P 2_{1} / n$ symmetry of negative vector chirality. Measurements of the spin-lattice relaxation rate $T_{1}^{- 1}$ reveal signatures of a gapless ground state and two-dimensional Berezinskii-Kosterlitz-Thouless (BKT)-type correlations above $T_{N}$ , extending over a broad temperature range of approximately 130 K in zero magnetic field. Within the same temperature range, the observed increase in the NQR linewidth is consistent with short-range chiral order recently identified by neutron scattering. Our results establish Cs $_{2}$ Cu $_{3}$ SnF $_{12}$ as a unique quantum kagome system exhibiting BKT behavior.

Discovery of BKT correlations in the quantum kagome compound Cs $_{2}$ Cu $_{3}$ SnF $_{12}$

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Discovery of BKT correlations in the quantum kagome compound Cs $_{2}$ Cu $_{3}$ SnF $_{12}$

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Discovery of BKT correlations in the quantum kagome compound Cs22​Cu33​SnF1212​

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Discovery of BKT correlations in the quantum kagome compound Cs22​Cu33​SnF1212​

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Discovery of BKT correlations in the quantum kagome compound Cs $_{2}$ Cu $_{3}$ SnF $_{12}$

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Discovery of BKT correlations in the quantum kagome compound Cs $_{2}$ Cu $_{3}$ SnF $_{12}$

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