学術雑誌論文

学術雑誌論文

text

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 1996, 53(1), p. 168-178

Solvable models of spin-1/2 chains with an energy gap

Sasaki, Shosuke

American Physical Society

英語

text

1996-01-01

https://doi.org/10.1103/PhysRevE.53.168

An XY model with two kinds of coupling constants J and -K is investigated. The system has plural spin sites in a unit cell, where the coupling constant inside a unit cell is -K, and the coupling constant between two unit cells is J. When the number of the spin sites L in a unit cell is even (or odd), there is an energy gap (or no gap) between the ground state and the first excited state (for ‖K/J‖≠1). The magnetization of the system with any even number of L vanishes below a critical magnetic field at the temperature T=0. Therefore, the susceptibility is zero at T=0 when L is even, but the susceptibility is positive when L is odd. The data for the magnetization of (CH_3)_4N Ni (NO_2)_3 resemble the calculated value of the magnetization for L=2.

Sasaki, Shosuke, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 53, 1, 168-178, 1996 of publication. "Copyright (1996) by the American Physical Society."

27146

Solvable models of spin-1/2 chains with an energy gap

Sasaki, Shosuke

American Physical Society

英語

1996-01-01

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

53

1

168

178

https://doi.org/10.1103/PhysRevE.53.168

https://hdl.handle.net/11094/27146