THERMODYNAMICS OF INTEGRABLE CHAINS WITH ALTERNATING SPINS

被引：57

作者：

DEVEGA, HJ ^{[1
]}

MEZINCESCU, L ^{[1
]}

NEPOMECHIE, RI ^{[1
]}

机构：

[1] UNIV MIAMI, DEPT PHYS, CORAL GABLES, FL 33124 USA

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.49.13223

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We consider a two-parameter (cBAR,c) family of quantum integrable isotropic Hamiltonians for a chain of alternating spins of spin s = 1/2 and s = 1. We determine the thermodynamics for low-temperature T and small external magnetic field H, with T << H. In the antiferromagnetic (cBAR > 0, c > 0) case, the model has two gapless excitations. In particular, for cBAR = c, the model is conformally invariant and has central charge c(vir) = 2. When one of these parameters is zero, the Bethe ansatz equations admit an infinite number of solutions with lowest energy.

引用

页码：13223 / 13226

页数：4

共 16 条

[1] UNIVERSAL TERM IN THE FREE-ENERGY AT A CRITICAL-POINT AND THE CONFORMAL ANOMALY [J].

AFFLECK, I .

PHYSICAL REVIEW LETTERS, 1986, 56 (07) :746-748

[2]

ALADIM SR, UNPUB

[3] HEISENBERG CHAIN WITH IMPURITIES (AN INTEGRABLE MODEL) [J].

ANDREI, N ;

JOHANNESSON, H .

PHYSICS LETTERS A, 1984, 100 (02) :108-112

[4] EXACT SOLUTION OF THE ISOTROPIC HEISENBERG CHAIN WITH ARBITRARY SPINS - THERMODYNAMICS OF THE MODEL [J].

BABUJIAN, HM .

NUCLEAR PHYSICS B, 1983, 215 (03) :317-336

[5] CONFORMAL-INVARIANCE, THE CENTRAL CHARGE, AND UNIVERSAL FINITE-SIZE AMPLITUDES AT CRITICALITY [J].

BLOTE, HWJ ;

CARDY, JL ;

NIGHTINGALE, MP .

PHYSICAL REVIEW LETTERS, 1986, 56 (07) :742-745

[6]

FADDEEV LD, 1984, J SOVIET MATH, V24, P241, DOI DOI 10.1007/BF01087245

[7]

Gohberg I, 1960, AM MATH SOC TRANSL, V14, P217, DOI DOI 10.1090/TRANS2/014/09

[8] LOW-TEMPERATURE THERMODYNAMICS OF DELTA GREATER THAN OR EQUAL TO 1 HEISENBERG-ISING RING [J].

JOHNSON, JD ;

MCCOY, BM .

PHYSICAL REVIEW A-GENERAL PHYSICS, 1972, 6 (04) :1613-+

[9] INTEGRABLE SPIN-1 HEISENBERG CHAIN WITH IMPURITY [J].

LEE, KJB ;

SCHLOTTMANN, P .

PHYSICAL REVIEW B, 1988, 37 (01) :379-383

[10]

Mezincescu L., 1993, Quantum Groups, Integrable Models and Statistical Systems. 1992 CAP/NSERC Summer Institute in Theoretical Physics, P168

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