Magnetic Phase Transition and Magnetization Plateau in Cs2CuBr4
نویسندگان
چکیده
The crystal structure of Cs2CuBr4 is the same as that of Cs2CuCl4, which has been characterized as a spin1 2 quasi-two-dimensional frustrated system. The magnetic properties of Cs2CuBr4 were investigated by magnetization and specific heat measurements. The phase transition at zero magnetic field was detected at TN = 1.4 K. It was observed that the magnetization curve has a plateau at about one-third of the saturation magnetization for magnetic field H parallel to the band c-axes, while no plateau was observed for H ‖ a. The field-induced phase transition to the plateau state appears to be of the first order. The mechanism leading to the magnetization plateau is discussed.
منابع مشابه
M ar 2 00 4 Magnetization plateaux of S = 1 / 2 two - dimensional frustrated antiferromagnet Cs 2 CuBr 4
The field induced magnetic phase transitions of Cs2CuBr4 were investigated by means of magnetization process and neutron scattering experiments. This system undergoes magnetic phase transition at Neél temperature TN = 1.4K at zero field, and exhibits the magnetization plateau at approximately one third of the saturation magnetization for the field directions H ‖ b and H ‖ c. In the present stud...
متن کاملNuclearmagnetic relaxation of Cs of distorted triangular antiferromagnet Cs2CuBr4
A quasi-two dimensional antiferromagnet Cs2CuBr4 is characterized as a frustrated spin system on a distorted triangular lattice. Cs-NMR experiments on Cs2CuBr4 have been performed in the range of the magnetic field applied along b-axis up to 15.9 T, which covers the field range for the 1/3 magnetization plateau. Field dependence of T−1 1 at 0.5 K shows a hysteresis around each end of the platea...
متن کاملQuantum stabilization of the 1/3-magnetization plateau in Cs2CuBr4.
We consider the phase diagram of a spatially anisotropic 2D triangular antiferromagnet in a magnetic field. Classically, the ground state is umbrellalike for all fields, but we show that the quantum phase diagram is much richer and contains a 1/3-magnetization plateau, two commensurate planar states, two incommensurate chiral umbrella phases, and, possibly, a spin density wave state separating ...
متن کاملMagnetic-Field Induced Quantum Phase Transitions in Triangular-Lattice Antiferromagnets
Cs2CuBr4 and Ba3NiSb2O9 are magnetically described as quasi-two-dimensional triangular-lattice antiferromagnets with spin1 2 and 1, respectively. We show that both systems exhibit a magnetization plateau at one-third of the saturation magnetization Ms due to the interplay of spin frustration and quantum fluctuation. In Cs2CuBr4 that has a spatially anisotropic triangular lattice, successive mag...
متن کاملCascade of magnetic-field-induced quantum phase transitions in a spin-1/2 triangular-lattice antiferromagnet.
We report magnetocaloric and magnetic-torque evidence that in Cs2CuBr4--a geometrically frustrated Heisenberg S=1/2 triangular-lattice antiferromagnet--quantum fluctuations stabilize a series of spin states at simple increasing fractions of the saturation magnetization Ms. Only the first of these states--at M=1/3Ms--has been theoretically predicted. We discuss how the higher fraction quantum st...
متن کامل