Microscopic Properties of the Pinwheel Kagome Compound Rb2Cu3SnF12

Scientific paper - Original scientific paper

• Author: Mihael Srđan Grbić
• Author: Steffen Kramer
• Author: Claude Berthier
• Author: Fabien Trousselet
• Author: Olivier Cepas
• Author: Hidekazu Tanaka
• Author: Mladen Horvatić; MBZ: 112333
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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.

• Keywords (english): frustration; magnetism; singlet; valence bond
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review Letters
• Numbering: vol. 110, no. 24, 247203
• p-ISSN: 0031-9007
• e-ISSN: 1079-7114
• DOI: https://doi.org/10.1103/PhysRevLett.110.247203
• URN:NBN: urn:nbn:hr:217:679116
• Publication: 2013
• Project: Number: 119-1191458-1022; Title (croatian): Mikrovalna istraživanja novih materijala; Leader: Miroslav Požek; Jurisdiction: Croatia; Funding stream: ZP
• Document URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.247203
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2013) by the American Physical Society. Received 5 November 2012; revised manuscript received 31 March 2013; published 12 June 2013.
• Created on: 2019-11-26 13:45:18