### Abstract

An improved Pade method is applied to the entropy and the reduced susceptibility expanded in powers of the internal energy in order to calculate the specific heat c(T) for S less than equivalent to 2 and the zero-field susceptibility for S equals one-half of a quantum Heisenberg spin chain, respectively. It is also shown that the polynomials with exponents given by spin wave theory (SW) cannot fit in with the Pade approximants for these cases. This disagreement with the behaviors of SW is ascribed, at least for S equals 1, to the nonzero gap.

Original language | English |
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Pages (from-to) | 516-528 |

Number of pages | 13 |

Journal | Journal of the Physical Society of Japan |

Volume | 54 |

Issue number | 2 |

Publication status | Published - 1985 Feb |

Externally published | Yes |

### Fingerprint

### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

**THERMODYNAMIC QUANTITIES OF MAGNETIC CHAINS - PADE APPROXIMANTS TO HIGH-TEMPERATURE EXPANSIONS ON THE INTERNAL ENERGY PLANE AND A POLYNOMIAL FITTING.** / Igarashi, Harukazu.

Research output: Contribution to journal › Article

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TY - JOUR

T1 - THERMODYNAMIC QUANTITIES OF MAGNETIC CHAINS - PADE APPROXIMANTS TO HIGH-TEMPERATURE EXPANSIONS ON THE INTERNAL ENERGY PLANE AND A POLYNOMIAL FITTING.

AU - Igarashi, Harukazu

PY - 1985/2

Y1 - 1985/2

N2 - An improved Pade method is applied to the entropy and the reduced susceptibility expanded in powers of the internal energy in order to calculate the specific heat c(T) for S less than equivalent to 2 and the zero-field susceptibility for S equals one-half of a quantum Heisenberg spin chain, respectively. It is also shown that the polynomials with exponents given by spin wave theory (SW) cannot fit in with the Pade approximants for these cases. This disagreement with the behaviors of SW is ascribed, at least for S equals 1, to the nonzero gap.

AB - An improved Pade method is applied to the entropy and the reduced susceptibility expanded in powers of the internal energy in order to calculate the specific heat c(T) for S less than equivalent to 2 and the zero-field susceptibility for S equals one-half of a quantum Heisenberg spin chain, respectively. It is also shown that the polynomials with exponents given by spin wave theory (SW) cannot fit in with the Pade approximants for these cases. This disagreement with the behaviors of SW is ascribed, at least for S equals 1, to the nonzero gap.

UR - http://www.scopus.com/inward/record.url?scp=0022012576&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0022012576&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0022012576

VL - 54

SP - 516

EP - 528

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 2

ER -