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- W2019943168 abstract "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 ensuremath{Vert}K/Jensuremath{Vert}ensuremath{ne}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 (${mathrm{CH}}_{3}$${)}_{4}$N Ni (${mathrm{NO}}_{2}$${)}_{3}$ resemble the calculated value of the magnetization for L=2. textcopyright{} 1996 The American Physical Society." @default.
- W2019943168 created "2016-06-24" @default.
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- W2019943168 date "1996-01-01" @default.
- W2019943168 modified "2023-09-27" @default.
- W2019943168 title "Solvable models of spin-1/2 chains with an energy gap" @default.
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- W2019943168 doi "https://doi.org/10.1103/physreve.53.168" @default.
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