Specific-heat anomaly near Tc of the (Bi,Pb)-Sr-Ca-Cu-O superconductor (Tc=107 K)

N. Okazaki, T. Hasegawa, K. Kishio, K. Kitazawa, A. Kishi, Y. Ikeda, M. Takano, K. Oda, H. Kitaguchi, J. Takada, Y. Miura

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Abstract

Specific-heat measurements of the 107-K phase of the (Bi,Pb)-Sr-Ca-Cu-O system were made in the temperature range 80250 K by an ac calorimetry method. A finite specific-heat jump at Tc (Cp/Tc=16 mJ mol-1 K-2) was first detected, from which the electronic specific-heat coefficient was calculated through the BCS relationship, i.e., 11 mJ mol-1 K-2, corresponding to the density of states N(0)=0.8 states eV-1 (Cu atom)-1 spin-1. This N(0) value was rather smaller than that of (La1-xMx)2CuO4 (M=1/rSr,Ca) or Ba2YCu3O7. This is in contrast with the usually observed positive correlation between Tc and N(0) among the conventional metallic superconductors. A broadened transition width and the sharpened peak at Tc observed in the CpT curve was attributed to the two-dimensional superconducting fluctuation effect with coherence length (0)=13 i/rA in the plane.

Original languageEnglish
Pages (from-to)4296-4301
Number of pages6
JournalPhysical Review B
Volume41
Issue number7
DOIs
Publication statusPublished - 1990

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BSCCO superconductors
Superconducting materials
Specific heat
specific heat
anomalies
heat measurement
Thermal variables measurement
Calorimetry
Atoms
curves
coefficients
electronics
atoms
Temperature
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Okazaki, N., Hasegawa, T., Kishio, K., Kitazawa, K., Kishi, A., Ikeda, Y., ... Miura, Y. (1990). Specific-heat anomaly near Tc of the (Bi,Pb)-Sr-Ca-Cu-O superconductor (Tc=107 K). Physical Review B, 41(7), 4296-4301. https://doi.org/10.1103/PhysRevB.41.4296

Specific-heat anomaly near Tc of the (Bi,Pb)-Sr-Ca-Cu-O superconductor (Tc=107 K). / Okazaki, N.; Hasegawa, T.; Kishio, K.; Kitazawa, K.; Kishi, A.; Ikeda, Y.; Takano, M.; Oda, K.; Kitaguchi, H.; Takada, J.; Miura, Y.

In: Physical Review B, Vol. 41, No. 7, 1990, p. 4296-4301.

Research output: Contribution to journalArticle

Okazaki, N, Hasegawa, T, Kishio, K, Kitazawa, K, Kishi, A, Ikeda, Y, Takano, M, Oda, K, Kitaguchi, H, Takada, J & Miura, Y 1990, 'Specific-heat anomaly near Tc of the (Bi,Pb)-Sr-Ca-Cu-O superconductor (Tc=107 K)', Physical Review B, vol. 41, no. 7, pp. 4296-4301. https://doi.org/10.1103/PhysRevB.41.4296
Okazaki N, Hasegawa T, Kishio K, Kitazawa K, Kishi A, Ikeda Y et al. Specific-heat anomaly near Tc of the (Bi,Pb)-Sr-Ca-Cu-O superconductor (Tc=107 K). Physical Review B. 1990;41(7):4296-4301. https://doi.org/10.1103/PhysRevB.41.4296
Okazaki, N. ; Hasegawa, T. ; Kishio, K. ; Kitazawa, K. ; Kishi, A. ; Ikeda, Y. ; Takano, M. ; Oda, K. ; Kitaguchi, H. ; Takada, J. ; Miura, Y. / Specific-heat anomaly near Tc of the (Bi,Pb)-Sr-Ca-Cu-O superconductor (Tc=107 K). In: Physical Review B. 1990 ; Vol. 41, No. 7. pp. 4296-4301.
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AU - Kitazawa, K.

AU - Kishi, A.

AU - Ikeda, Y.

AU - Takano, M.

AU - Oda, K.

AU - Kitaguchi, H.

AU - Takada, J.

AU - Miura, Y.

PY - 1990

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N2 - Specific-heat measurements of the 107-K phase of the (Bi,Pb)-Sr-Ca-Cu-O system were made in the temperature range 80250 K by an ac calorimetry method. A finite specific-heat jump at Tc (Cp/Tc=16 mJ mol-1 K-2) was first detected, from which the electronic specific-heat coefficient was calculated through the BCS relationship, i.e., 11 mJ mol-1 K-2, corresponding to the density of states N(0)=0.8 states eV-1 (Cu atom)-1 spin-1. This N(0) value was rather smaller than that of (La1-xMx)2CuO4 (M=1/rSr,Ca) or Ba2YCu3O7. This is in contrast with the usually observed positive correlation between Tc and N(0) among the conventional metallic superconductors. A broadened transition width and the sharpened peak at Tc observed in the CpT curve was attributed to the two-dimensional superconducting fluctuation effect with coherence length (0)=13 i/rA in the plane.

AB - Specific-heat measurements of the 107-K phase of the (Bi,Pb)-Sr-Ca-Cu-O system were made in the temperature range 80250 K by an ac calorimetry method. A finite specific-heat jump at Tc (Cp/Tc=16 mJ mol-1 K-2) was first detected, from which the electronic specific-heat coefficient was calculated through the BCS relationship, i.e., 11 mJ mol-1 K-2, corresponding to the density of states N(0)=0.8 states eV-1 (Cu atom)-1 spin-1. This N(0) value was rather smaller than that of (La1-xMx)2CuO4 (M=1/rSr,Ca) or Ba2YCu3O7. This is in contrast with the usually observed positive correlation between Tc and N(0) among the conventional metallic superconductors. A broadened transition width and the sharpened peak at Tc observed in the CpT curve was attributed to the two-dimensional superconducting fluctuation effect with coherence length (0)=13 i/rA in the plane.

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