Critical Spin Liquid versus Valence Bond Glass in Triangular Lattice Organic κ-(ET)2Cu2(CN)3
ORAL
Abstract
The organic triangular-lattice antiferromagnet κ-(ET)2Cu2(CN)3 has been extensively discussed as a quantum spin liquid (QSL) candidate. Recently, an intriguing quantum critical behaviour was suggested from low-temperature B/T scaling of the magnetic torque experiments [1]. Through microscopic analysis of all anisotropic contributions, including Dzyaloshinskii-Moriya and multi-spin scalar chiral interactions, we highlight significant deviations of the experimental observations from a quantum critical scenario. Instead, we show that disorder-induced spin defects provide a comprehensive explanation of the low-temperature properties[2]. These spins are attributed to valence bond defects that emerge spontaneously as the QSL enters a valence bond glass phase at low temperature. This theoretical treatment is applicable to a general class of frustrated magnetic systems; similar scaling is also observed in the Kagome lattice antiferromagnet Herbertsmithite[3].
[1] Isono et al., Nature Communications 7, 13494 (2016).
[2] K. Riedl et al., arXiv: 1808.03868 (2018).
[3] J. S. Helton et al., PRL 104, 147201 (2010).
[1] Isono et al., Nature Communications 7, 13494 (2016).
[2] K. Riedl et al., arXiv: 1808.03868 (2018).
[3] J. S. Helton et al., PRL 104, 147201 (2010).
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Presenters
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Stephen Winter
Goethe University Frankfurt, Physics, Goethe University Frankfurt, Institute for Theoretical Physics, Goethe University Frankfurt
Authors
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Kira M. Riedl
Goethe University Frankfurt, Institute for Theoretical Physics, Goethe University Frankfurt
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Roser Valenti
Institute of Theoretical Physics, Goethe University Frankfurt, Frankfurt am Main, Germany., Institut für Theoretische Physik Goethe Universität Frankfurt am Mai, Goethe University Frankfurt, Physics, Goethe University Frankfurt, Institute for Theoretical Physics, Goethe University Frankfurt
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Stephen Winter
Goethe University Frankfurt, Physics, Goethe University Frankfurt, Institute for Theoretical Physics, Goethe University Frankfurt