Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2006-08-29
J. Phys.: Condens. Matter 19 (2007) 145218.
Physics
Condensed Matter
Disordered Systems and Neural Networks
6 pages, 2 figures, to appear in J. Phys. Condens. Matter (proceedings of the HFM2006 conference)
Scientific paper
10.1088/0953-8984/19/14/145218
The spin-glass phase in the $\LHx$ compound is considered. At zero transverse field this system is well described by the classical Ising model. At finite transverse field deviations from the transverse field quantum Ising model are significant, and one must take properly into account the hyperfine interactions, the off-diagonal terms in the dipolar interactions, and details of the full J=8 spin Hamiltonian to obtain the correct physical picture. In particular, the system is not a spin glass at finite transverse fields and does not show quantum criticality.
Laflorencie Nicolas
Schechter Moshe
Stamp Philip C. E.
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