## Abstract

The specific heat of the isotropic S=1/2 Heisenberg antiferromagnetic chain is proportional to the temperature at low T. The proportionality constant gamma is a function of field. The authors show that the low-field limit is anomalous in the sense that lim_{H to 0}lim_{T to 0} gamma =(1+ square root e/ pi )/3 differs from lim_{T to 0}lim_{H to 0} gamma =^{2}/_{3}. They also obtain an approximate interpolation formula between these two limits for situations in which H and T tend to zero simultaneously.

Original language | English |
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Article number | 016 |

Pages (from-to) | 2759-2763 |

Number of pages | 5 |

Journal | Journal of Physics Condensed Matter |

Volume | 1 |

Issue number | 16 |

DOIs | |

State | Published - 1989 |

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