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Low-temperature thermodynamic properties of a random Heisenberg antiferromagnetic chain (S= 1 / 2 )

1980; IOP Publishing; Volume: 13; Issue: 3 Linguagem: Inglês

10.1088/0022-3719/13/3/005

1747-3802

J. E. Hirsch, Jorge V. José,

Spectroscopy and Quantum Chemical Studies

The low-temperature thermodynamic properties of a random antiferromagnetic Heisenberg chain in zero magnetic field are studied approximately by a renormalisation group method. The couplings J obey a probability distribution function P(J) approximately 1/Jalpha , with alpha a constant. It is found that the susceptibility chi and the specific heat C behave like chi approximately T- alpha chi and C approximately T1- alpha c at low temperatures alpha chi and alpha c are weakly varying functions of temperature and slowly approach unity as T goes to zero. Comparison of these results with other theoretical analysis as well as experimental results on organic charge transfer compounds is also discussed.