Quantum 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 the two chiral phases. Our analysis sheds light on several recent experimental findings for Cs2CuBr4.
Alicea
Jason
J
Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
Chubukov
Andrey V
AV
Starykh
Oleg A
OA