Spin gap and hole pairing of Sr14-xAxCu24O41(A = Ca and La) single crystals studied by the electrical resistivity and thermal conductivity

Kazutaka Kudo, S. Ishikawa, T. Noji, T. Adachi, Y. Koike, K. Maki, S. Tsuji, K. Kumagai

Research output: Contribution to journalArticle

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Abstract

We have measured the electrical resistivity ρ and the thermal conductivity κ of Sr14-xAxCu24O41(A = Ca and La) single crystals. The Arrhenius plot of In ρ vs T-1 gives two kinds of activation energy with a boundary temperature Tρ. The activation energy at T <Tρ is in approximate agreement with the spin gap in the ladder estimated from the NMR measurements, suggesting that holes in the ladder are paired and localized at T <Tρ. The observed κ has been analyzed to be composed of κph, κspin and κhole due to phonons, spins and holes, respectively. The κph exhibits a small peak at ∼ 30 K in every direction of every single-crystal. The contribution of κspin is observed along the c-axis except for x(Ca) ≥ 6, and the spin gap, which corresponds to the spin excitation from spin-singlet to spin-triplet, has been estimated to be ∼ 420 K. For x(Ca) ≥ 6, the spin gap, which corresponds to the destruction of spin-singlet pairs i.e. the dissociation of hole pairs, has been estimated from κ along the c-axis at T > Tρ to decrease with increasing x(Ca).

Original languageEnglish
Pages (from-to)1689-1693
Number of pages5
JournalJournal of Low Temperature Physics
Volume117
Issue number5-6
Publication statusPublished - 1999
Externally publishedYes

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Thermal conductivity
thermal conductivity
Activation energy
Single crystals
activation energy
Arrhenius plots
conductivity
electrical resistivity
single crystals
plots
Temperature
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Spin gap and hole pairing of Sr14-xAxCu24O41(A = Ca and La) single crystals studied by the electrical resistivity and thermal conductivity. / Kudo, Kazutaka; Ishikawa, S.; Noji, T.; Adachi, T.; Koike, Y.; Maki, K.; Tsuji, S.; Kumagai, K.

In: Journal of Low Temperature Physics, Vol. 117, No. 5-6, 1999, p. 1689-1693.

Research output: Contribution to journalArticle

Kudo, K, Ishikawa, S, Noji, T, Adachi, T, Koike, Y, Maki, K, Tsuji, S & Kumagai, K 1999, 'Spin gap and hole pairing of Sr14-xAxCu24O41(A = Ca and La) single crystals studied by the electrical resistivity and thermal conductivity', Journal of Low Temperature Physics, vol. 117, no. 5-6, pp. 1689-1693.
Kudo, Kazutaka ; Ishikawa, S. ; Noji, T. ; Adachi, T. ; Koike, Y. ; Maki, K. ; Tsuji, S. ; Kumagai, K. / Spin gap and hole pairing of Sr14-xAxCu24O41(A = Ca and La) single crystals studied by the electrical resistivity and thermal conductivity. In: Journal of Low Temperature Physics. 1999 ; Vol. 117, No. 5-6. pp. 1689-1693.
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T1 - Spin gap and hole pairing of Sr14-xAxCu24O41(A = Ca and La) single crystals studied by the electrical resistivity and thermal conductivity

AU - Kudo, Kazutaka

AU - Ishikawa, S.

AU - Noji, T.

AU - Adachi, T.

AU - Koike, Y.

AU - Maki, K.

AU - Tsuji, S.

AU - Kumagai, K.

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N2 - We have measured the electrical resistivity ρ and the thermal conductivity κ of Sr14-xAxCu24O41(A = Ca and La) single crystals. The Arrhenius plot of In ρ vs T-1 gives two kinds of activation energy with a boundary temperature Tρ. The activation energy at T <Tρ is in approximate agreement with the spin gap in the ladder estimated from the NMR measurements, suggesting that holes in the ladder are paired and localized at T <Tρ. The observed κ has been analyzed to be composed of κph, κspin and κhole due to phonons, spins and holes, respectively. The κph exhibits a small peak at ∼ 30 K in every direction of every single-crystal. The contribution of κspin is observed along the c-axis except for x(Ca) ≥ 6, and the spin gap, which corresponds to the spin excitation from spin-singlet to spin-triplet, has been estimated to be ∼ 420 K. For x(Ca) ≥ 6, the spin gap, which corresponds to the destruction of spin-singlet pairs i.e. the dissociation of hole pairs, has been estimated from κ along the c-axis at T > Tρ to decrease with increasing x(Ca).

AB - We have measured the electrical resistivity ρ and the thermal conductivity κ of Sr14-xAxCu24O41(A = Ca and La) single crystals. The Arrhenius plot of In ρ vs T-1 gives two kinds of activation energy with a boundary temperature Tρ. The activation energy at T <Tρ is in approximate agreement with the spin gap in the ladder estimated from the NMR measurements, suggesting that holes in the ladder are paired and localized at T <Tρ. The observed κ has been analyzed to be composed of κph, κspin and κhole due to phonons, spins and holes, respectively. The κph exhibits a small peak at ∼ 30 K in every direction of every single-crystal. The contribution of κspin is observed along the c-axis except for x(Ca) ≥ 6, and the spin gap, which corresponds to the spin excitation from spin-singlet to spin-triplet, has been estimated to be ∼ 420 K. For x(Ca) ≥ 6, the spin gap, which corresponds to the destruction of spin-singlet pairs i.e. the dissociation of hole pairs, has been estimated from κ along the c-axis at T > Tρ to decrease with increasing x(Ca).

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