Specific heat of YBa2Cu3O7-δ and BaCuO2+x in magnetic fields up to 6 T

T. Sasaki, O. Nakatsu, N. Kobayashi, Ayako Yamamoto, M. Kikuchi, A. Liu, K. Hiraga, Y. Syono, Y. Muto

Research output: Contribution to journalArticle

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Abstract

The specific heat C of YBa2Cu3O7-δ (δ=0, 0.69, 0.91), Y1.1Ba1.9Cu3O7-δ and BaCuO2+x has been investigated in magnetic fields up to 6 T. In addition to the γ*T term and the upturn, characteristic behaviors of C/T consisting of the increase of γ* with magnetic fields, an appearance of a broad hump and a rapid decrease of C/T toward zero at the lowest temperatures are observed in all the YBa2Cu3O7-δ samples investigated. BaCuO2+x, one of the possible impurity phases included in the Y-Ba-Cu-O system, also shows a similar behavior of C/T as YBa2Cu3O7-δ. Particularly, BaCuO2+x explains the anomalous phenomenon observed in YBa2Cu3O6.31 at 6 T that the C/T at 1.5 K attains to the γ* value at 0 T. The γ* value is attributed to the BaCuO2+x included in the matrix.

Original languageEnglish
Pages (from-to)395-404
Number of pages10
JournalPhysica C: Superconductivity and its Applications
Volume156
Issue number3
DOIs
Publication statusPublished - 1988 Oct 1
Externally publishedYes

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Specific heat
specific heat
Magnetic fields
magnetic fields
Impurities
impurities
matrices
Temperature
barium copper yttrium oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Specific heat of YBa2Cu3O7-δ and BaCuO2+x in magnetic fields up to 6 T. / Sasaki, T.; Nakatsu, O.; Kobayashi, N.; Yamamoto, Ayako; Kikuchi, M.; Liu, A.; Hiraga, K.; Syono, Y.; Muto, Y.

In: Physica C: Superconductivity and its Applications, Vol. 156, No. 3, 01.10.1988, p. 395-404.

Research output: Contribution to journalArticle

Sasaki, T, Nakatsu, O, Kobayashi, N, Yamamoto, A, Kikuchi, M, Liu, A, Hiraga, K, Syono, Y & Muto, Y 1988, 'Specific heat of YBa2Cu3O7-δ and BaCuO2+x in magnetic fields up to 6 T', Physica C: Superconductivity and its Applications, vol. 156, no. 3, pp. 395-404. https://doi.org/10.1016/0921-4534(88)90763-0
Sasaki, T. ; Nakatsu, O. ; Kobayashi, N. ; Yamamoto, Ayako ; Kikuchi, M. ; Liu, A. ; Hiraga, K. ; Syono, Y. ; Muto, Y. / Specific heat of YBa2Cu3O7-δ and BaCuO2+x in magnetic fields up to 6 T. In: Physica C: Superconductivity and its Applications. 1988 ; Vol. 156, No. 3. pp. 395-404.
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abstract = "The specific heat C of YBa2Cu3O7-δ (δ=0, 0.69, 0.91), Y1.1Ba1.9Cu3O7-δ and BaCuO2+x has been investigated in magnetic fields up to 6 T. In addition to the γ*T term and the upturn, characteristic behaviors of C/T consisting of the increase of γ* with magnetic fields, an appearance of a broad hump and a rapid decrease of C/T toward zero at the lowest temperatures are observed in all the YBa2Cu3O7-δ samples investigated. BaCuO2+x, one of the possible impurity phases included in the Y-Ba-Cu-O system, also shows a similar behavior of C/T as YBa2Cu3O7-δ. Particularly, BaCuO2+x explains the anomalous phenomenon observed in YBa2Cu3O6.31 at 6 T that the C/T at 1.5 K attains to the γ* value at 0 T. The γ* value is attributed to the BaCuO2+x included in the matrix.",
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AU - Kikuchi, M.

AU - Liu, A.

AU - Hiraga, K.

AU - Syono, Y.

AU - Muto, Y.

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N2 - The specific heat C of YBa2Cu3O7-δ (δ=0, 0.69, 0.91), Y1.1Ba1.9Cu3O7-δ and BaCuO2+x has been investigated in magnetic fields up to 6 T. In addition to the γ*T term and the upturn, characteristic behaviors of C/T consisting of the increase of γ* with magnetic fields, an appearance of a broad hump and a rapid decrease of C/T toward zero at the lowest temperatures are observed in all the YBa2Cu3O7-δ samples investigated. BaCuO2+x, one of the possible impurity phases included in the Y-Ba-Cu-O system, also shows a similar behavior of C/T as YBa2Cu3O7-δ. Particularly, BaCuO2+x explains the anomalous phenomenon observed in YBa2Cu3O6.31 at 6 T that the C/T at 1.5 K attains to the γ* value at 0 T. The γ* value is attributed to the BaCuO2+x included in the matrix.

AB - The specific heat C of YBa2Cu3O7-δ (δ=0, 0.69, 0.91), Y1.1Ba1.9Cu3O7-δ and BaCuO2+x has been investigated in magnetic fields up to 6 T. In addition to the γ*T term and the upturn, characteristic behaviors of C/T consisting of the increase of γ* with magnetic fields, an appearance of a broad hump and a rapid decrease of C/T toward zero at the lowest temperatures are observed in all the YBa2Cu3O7-δ samples investigated. BaCuO2+x, one of the possible impurity phases included in the Y-Ba-Cu-O system, also shows a similar behavior of C/T as YBa2Cu3O7-δ. Particularly, BaCuO2+x explains the anomalous phenomenon observed in YBa2Cu3O6.31 at 6 T that the C/T at 1.5 K attains to the γ* value at 0 T. The γ* value is attributed to the BaCuO2+x included in the matrix.

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