Magnon thermal conductivity in the spin-gap state and the antiferromagnetically ordered state of low-dimensional copper oxides

K. Kudo, Y. Koike, S. Kurogi, T. Noji, T. Nishizaki, N. Kobayashi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We have looked for large thermal-conductivity due to magnons, k magnon, in various kinds of low-dimensional quantum spin systems, such as the two-leg spin-ladder system Sr14Cu24O 41, the two-dimensional spin-dimer system SrCu2(BO 3)2, the four-leg spin-ladder system La2Cu 2O5, the two-dimensional spin system Cu3B 2O6 and the one-dimensional spin system Ca 2Y2Cu5O10, using large-sized single-crystals grown by the TSFZ method. Large kmagnon has been found in the spin-gap state of Sr14Cu24O41 whose bandwidth of the triplet excitation is large, owing to the enhancement of the mean free path of magnons. In gapless systems, it has been found that K magnon increases with increasing magnon-velocity, which increases with increasing exchange-interaction between Cu2+ spins and is larger in antiferromagnetic spin-correlation systems than in ferromagnetic spin-correlation systems. Therefore, it is concluded that essential factors of large kmagnon are a large bandwidth of the triplet excitation in a spin-gap system, a large exchange-interaction and antiferromagnetic spin-correlation rather than ferromagnetic spin-correlation.

Original languageEnglish
Pages (from-to)94-95
Number of pages2
JournalJournal of Magnetism and Magnetic Materials
Volume272-276
Issue numberI
DOIs
Publication statusPublished - May 2004
Externally publishedYes

Keywords

  • Antiferromagnetic order
  • Low-dimensional copper oxide
  • Magnon thermal conductivity
  • Spin-gap

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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