Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-11-14
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 7 figures
Scientific paper
10.1103/PhysRevB.78.224405
Magnetization measurements under a hydrostatic pressure of P = 1.4 GPa were performed on the coupled spin dimer system TlCuCl_3, which exhibits a pressure-induced quantum phase transition from a gapped singlet state to an antiferromagnetic state at P_c = 0.042 GPa. Antiferromagnetic ordering with ordered moments parallel to the ac plane was observed at T_N = 16.7 K at 1.4 GPa. The spin reorientation phase transition was observed at T_R ~ 9.2 K for zero magnetic field, at which the ordered moments start to incline towards the b axis. With increasing external field parallel to th b axis, a second-order phase transition from the oblique antiferromagnetic (OAF) phase to the spin-flop (SF) phase occurs below T_R. We argue that the OAF phase arises from the competition between the anisotropic energies of the conventional second order and the fourth order, that increases with increasing pressure. We discuss the OAF-SF transition within the framework of the mean field approximation.
Ishii Yasuyuki
Matsuzaki Teiichiro
Suzuki Takao
Tanaka Hidekazu
Yamada Fumiko
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