Publications associated with Quantum Magnetism and Quantum Phase Transitions

Field-induced quantum phase transition in the quasi 1D XY-like antiferromagnet Cs<inf>2</inf>CoCl<inf>4</inf>

Journal of Magnetism and Magnetic Materials 272-276 (2004) 920-921

CJ Mukherjee, R Coldea, DA Tennant, M Koza, M Enderle, K Habicht, P Smeibidl, Z Tylczynski

We explore the magnetic excitations as a function of applied field in the quasi 1D s=12 XY-like magnet Cs 2 CoCl 4 . A transition from spin-flop antiferromagnetic order to a quantum paramagnet occurs at the critical field B C =2.15 T and fields higher than 2.5 T fully align the spins along the field. In the spin-flop phase gapped scattering continua dominate, identified with the creation of pairs of quantum domain walls. In the saturated phase sharp peaks are observed, as expected for magnons in a ferromagnetically ordered ground state. © 2003 Elsevier B.V. All rights reserved.

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