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Magnetic phase diagram of the quasi-two-dimensional S=1/2 antiferromagnet Cs2CuBr4

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: H Tsujii, C R Rotundu, T Ono, B Andraka, H Tanaka and Y Takano

Editorial: AIP Conference Proceedings, 850, p.1093, 2006.


Cs2CuBr4 is one of the best candidates for the spin-1/2 Heisenberg antiferromagnet on the triangular lattice. To date, it is the only spin-1/2 material in which a magnetization plateau has been observed at 1/3 of the saturation magnetization — the hallmark of the triangular-lattice Heisenberg antiferromagnet. We have made a detailed determination of the magnetic phase diagram of Cs2CuBr4 in magnetic fields up to 18 T, using specific-heat and magnetocaloric-effect measurements. The results for the field direction parallel to the c axis of the sample indicate that the transition between the phase at the plateau of magnetization and the adjacent ordered phases is first order. ©2006 American Institute of Physics

Cuvinte cheie: Cs2CuBr4, specific heat, spin-1/2 heisenberg antiferromagnet