Microscopic Properties of the Pinwheel Kagome Compound Rb2Cu3SnF12

Grbić, Mihael Srđan and Kramer, Steffen and Berthier, Claude and Trousselet, Fabien and Cepas, Olivier and Tanaka, Hidekazu and Horvatić, Mladen (2013) Microscopic Properties of the Pinwheel Kagome Compound Rb2Cu3SnF12. Physical Review Letters, 110 (24). pp. 247203-5. ISSN 0031-9007

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Using 63,65Cu nuclear magnetic resonance in magnetic fields up to 30 T, we study the microscopic properties of the 12-site valence-bond-solid ground state in the “pinwheel” kagome compound Rb2Cu3SnF12. We find that the ground state is characterized by a strong transverse staggered spin polarization whose temperature and field dependence points to a mixing of the singlet and triplet states. This is further corroborated by the field dependence of the gap Δ(H), which has a level anticrossing with a large minimum gap value of ≈Δ(0)/2, with no evidence of a phase transition down to 1.5 K. By the exact diagonalization of small clusters, we show that the observed anticrossing is mainly due to staggered tilts of the g tensors defined by the crystal structure and reveal symmetry properties of the low-energy excitation spectrum compatible with the absence of level crossing.

Item Type: Article
Keywords: frustration, magnetism, singlet, valence bond
Date: June 2013
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2013) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1022
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 04 Jun 2014 19:39
Last Modified: 23 Feb 2016 15:25
URI: http://digre.pmf.unizg.hr/id/eprint/2210

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