Observation of new magnetic ground state in frustrated quantum antiferromagnet spin-liquid system Cs2CuCl4
Hyeong-Jin Kim1,2, C.R.S. Haines1, C. Liu1, Sae Hwan Chun2, Kee Hoon Kim2, H.T. Yi3, Sang-Wook Cheong3, and Siddharth S. Saxena1
1Quantum Matter Group, Cavendish Laboratory, University of Cambridge Madingley Road, Cambridge CB3 0HE, United Kingdom
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2CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
3Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
Received February 7, 2017
Cs2CuCl4 is known to possess a quantum spin-liquid phase with antiferromagnetic interaction below 2.8 K. We report the observation of a new metastable magnetic phase of the triangular frustrated quantum spin system Cs2CuCl4 induced by the application of hydrostatic pressure. We measured the magnetic properties of Cs2CuCl4 following the application and release of pressure after 3 days. We observed a previously unknown ordered magnetic phase with a transition temperature of 9 K. Furthermore, the recovered sample with new magnetic ground state possesses an equivalent crystal structure to the uncompressed one with antiferromagnetic quantum spin-liquid phase.
PACS: 75.10.Kt Quantum spin liquids, valence bond phases and related phenomena; PACS: 75.50.–y Studies of specific magnetic materials; PACS: 75.50.Ee Antiferromagnetics.