Specific heat study of magnetic excitations in a one-dimensional S =1 Heisenberg magnet with strong planar anisotropy

Сильно коррелированные системы и высокотемпературная сверхпроводимость

Автор(и)

  • A. Feher Department of Experimental Physics, Faculty of Science, P.J.Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia
  • M. Orendáč Department of Experimental Physics, Faculty of Science, P.J.Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia
  • A. Orendáčová Department of Experimental Physics, Faculty of Science, P.J.Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia
  • E. Čižmár Department of Experimental Physics, Faculty of Science, P.J.Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia

DOI:

https://doi.org/10.1063/1.1496666

Ключові слова:

PACS: 75.40.Cx, 71.20.Be, 75.50.Ee

Анотація

The results of experimental studies of the specific heat of the magnetic chain compounds Ni(C2H8N2)2Ni(CN)4, Ni(C11H10N2O)2Ni(CN)4, and Ni(C10H8N2)2Ni(CN)4×H2O are reported. All compounds are identified as S = 1 planar Heisenberg magnetic chains with large planar anisotropy and different values of the in-plane anisotropy constant. The low-temperature specific heat data are interpreted assuming the existence of noninteracting excitons and antiexcitons as elementary excitations from the singlet-ground state. The extended strong-coupling model is used for analysis of the data at higher temperatures. The applicability of the models used with respect to the value of the in-plane anisotropy is discussed.

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Опубліковано

2002-06-10

Як цитувати

(1)
Feher, A.; Orendáč, M.; Orendáčová, A.; Čižmár, E. Specific Heat Study of Magnetic Excitations in a One-Dimensional S =1 Heisenberg Magnet With Strong Planar Anisotropy: Сильно коррелированные системы и высокотемпературная сверхпроводимость. Fiz. Nizk. Temp. 2002, 28, 768-773.

Номер

Том 28 № 7 (2002)

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