Spin-12 XXZ chain system Cs2CoCl4 in a transverse magnetic field

O. Breunig, M. Garst, E. Sela, B. Buldmann, P. Becker, L. Bohatý, R. Müller, T. Lorenz

Research output: Contribution to journalArticlepeer-review


Comparing high-resolution specific heat and thermal expansion measurements to exact finite-size diagonalization, we demonstrate that Cs 2CoCl4 for a magnetic field along the crystallographic b axis realizes the spin-12 XXZ chain in a transverse field. Exploiting both thermal as well as virtual excitations of higher crystal-field states, we find that the spin chain is in the XY limit with an anisotropy Jz/J ≈0.12, substantially smaller than previously believed. A spin-flop Ising quantum phase transition occurs at a critical field of μ0Hbcr≈2 T before around 3.5 T the description in terms of an effective spin-12 chain becomes inapplicable.

Original languageEnglish
Article number187202
JournalPhysical Review Letters
Issue number18
StatePublished - 29 Oct 2013


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