Thermodynamic Properties of the S=1/2 Heisenberg Chain with Staggered Dzyaloshinsky-Moriya Interaction

Abstract

Thermodynamic properties of the S=1/2 Heisenberg chain in transverse staggered magnetic field H_s^y and uniform magnetic field H^x perpendicular to the staggered field is studied by the finite-temperature density-matrix renormalization-group method. The uniform and staggered magnetizations and specific heat are calculated from zero temperature to high temperatures up to T=4J under various strength of magnetic fields H_s^y and H^x. The specific heat and magnetization of the effective Hamiltonian of the Yb₄As₃ are also presented, and field induced gap formation and diverging magnetic susceptibility at low temperature are shown.