TY - JOUR
T1 - Spin-12 XXZ chain system Cs2CoCl4 in a transverse magnetic field
AU - Breunig, O.
AU - Garst, M.
AU - Sela, E.
AU - Buldmann, B.
AU - Becker, P.
AU - Bohatý, L.
AU - Müller, R.
AU - Lorenz, T.
PY - 2013/10/29
Y1 - 2013/10/29
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84887095795&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.111.187202
DO - 10.1103/PhysRevLett.111.187202
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AN - SCOPUS:84887095795
SN - 0031-9007
VL - 111
JO - Physical Review Letters
JF - Physical Review Letters
IS - 18
M1 - 187202
ER -