The spin-1/2 Heisenberg chain: thermodynamics, quantum criticality and spin-Peierls exponents

Details The spin-1/2 Heisenberg chain: thermodynamics, quantum criticality and spin-Peierls exponents The spin-1/2 Heisenberg chain: thermodynamics, quantum criticality and spin-Peierls exponents

1998-03-18

arxiv.org/abs/cond-mat/9803225v2

Physics

Condensed Matter

Statistical Mechanics

to be published in Euro. Phys. J. B

Scientific paper

10.1007/s100510050491

We present numerical and analytical results for the thermodynamical properties of the spin-1/2 Heisenberg chain at arbitrary external magnetic field. Special emphasis is placed on logarithmic corrections in the susceptibility and specific heat at very low temperatures ($T/J=10^{-24}$) and small fields. A longstanding controversy about the specific heat is resolved. At zero temperature the spin-Peierls exponent is calculated in dependence on the external magnetic field. This describes the energy response of the system to commensurate and incommensurate modulations of the lattice. The exponent for the spin gap in the incommensurate phase is given.

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