Spin gap of Sr14-xAxCu24-yMyO41 (A = Ca,La: M = Zn,Ni) studied by thermal conductivity

Kazutaka Kudo, Y. Koike, K. Maki, S. Tsuji, K. Kumagai

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Abstract

We have investigated the spin gap and hole pairing in the ladder of Sr14-xAxCu24-yMyO41 (A = Ca,La: M = Zn,Ni) from the thermal conductivity measurements. The observed thermal conductivity κ has been analyzed to be composed of κph, κspin and κhole due to phonons, spins and holes, respectively. κph shows a peak or a shoulder at approximately 30 K in every direction of every crystal. κspin is observed only along the c-axis and exhibits a broad peak around 100-150 K. The broad peak is depressed through the Zn substitution more markedly than the Ni substitution. The spin gap in the ladder estimated from κspin is approximately 400 K and independent of x. This corresponds to the spin excitation from spin-singlet to spin-triplet. κhole becomes marked at high temperatures for larger x(Ca) values. The spin gap in the ladder estimated from κhole decreases with increasing x(Ca). This corresponds to the gap due to the dissociation of spin-singlet pairs, i.e. the dissociation of hole pairs.

Original languageEnglish
Pages (from-to)361-364
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Volume62
Issue number1-2
DOIs
Publication statusPublished - Jan 2001
Externally publishedYes

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Ladders
Thermal conductivity
thermal conductivity
Substitution reactions
Phonons
ladders
Crystals
dissociation
substitutes
Temperature
shoulders
phonons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Spin gap of Sr14-xAxCu24-yMyO41 (A = Ca,La : M = Zn,Ni) studied by thermal conductivity. / Kudo, Kazutaka; Koike, Y.; Maki, K.; Tsuji, S.; Kumagai, K.

In: Journal of Physics and Chemistry of Solids, Vol. 62, No. 1-2, 01.2001, p. 361-364.

Research output: Contribution to journalArticle

Kudo, Kazutaka ; Koike, Y. ; Maki, K. ; Tsuji, S. ; Kumagai, K. / Spin gap of Sr14-xAxCu24-yMyO41 (A = Ca,La : M = Zn,Ni) studied by thermal conductivity. In: Journal of Physics and Chemistry of Solids. 2001 ; Vol. 62, No. 1-2. pp. 361-364.
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N2 - We have investigated the spin gap and hole pairing in the ladder of Sr14-xAxCu24-yMyO41 (A = Ca,La: M = Zn,Ni) from the thermal conductivity measurements. The observed thermal conductivity κ has been analyzed to be composed of κph, κspin and κhole due to phonons, spins and holes, respectively. κph shows a peak or a shoulder at approximately 30 K in every direction of every crystal. κspin is observed only along the c-axis and exhibits a broad peak around 100-150 K. The broad peak is depressed through the Zn substitution more markedly than the Ni substitution. The spin gap in the ladder estimated from κspin is approximately 400 K and independent of x. This corresponds to the spin excitation from spin-singlet to spin-triplet. κhole becomes marked at high temperatures for larger x(Ca) values. The spin gap in the ladder estimated from κhole decreases with increasing x(Ca). This corresponds to the gap due to the dissociation of spin-singlet pairs, i.e. the dissociation of hole pairs.

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