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

T. Sasaki; O. Nakatsu; N. Kobayashi; A. Tokiwa; M. Kikuchi; A. Liu; K. Hiraga; Y. Syono; Y. Muto

doi:10.1016/0921-4534(88)90763-0

Specific heat of YBa₂Cu₃O_7-δ and BaCuO_2+x in magnetic fields up to 6 T

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

Global course of Engineering and Science

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Abstract

The specific heat C of YBa₂Cu₃O_7-δ (δ=0, 0.69, 0.91), Y_1.1Ba_1.9Cu₃O_7-δ and BaCuO_2+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 YBa₂Cu₃O_7-δ samples investigated. BaCuO_2+x, one of the possible impurity phases included in the Y-Ba-Cu-O system, also shows a similar behavior of C/T as YBa₂Cu₃O_7-δ. Particularly, BaCuO_2+x explains the anomalous phenomenon observed in YBa₂Cu₃O_6.31 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 BaCuO_2+x included in the matrix.

Original language	English
Pages (from-to)	395-404
Number of pages	10
Journal	Physica C: Superconductivity and its applications
Volume	156
Issue number	3
DOIs	https://doi.org/10.1016/0921-4534(88)90763-0
Publication status	Published - 1988 Oct 1

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ASJC Scopus subject areas

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

Cite this

Sasaki, T., Nakatsu, O., Kobayashi, N., Tokiwa, A., Kikuchi, M., Liu, A., Hiraga, K., Syono, Y., & Muto, Y. (1988). Specific heat of YBa₂Cu₃O_7-δ and BaCuO_2+x in magnetic fields up to 6 T. Physica C: Superconductivity and its applications, 156(3), 395-404. https://doi.org/10.1016/0921-4534(88)90763-0

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

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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T1 - Specific heat of YBa2Cu3O7-δ and BaCuO2+x in magnetic fields up to 6 T

AU - Sasaki, T.

AU - Nakatsu, O.

AU - Kobayashi, N.

AU - Tokiwa, A.

AU - Kikuchi, M.

AU - Liu, A.

AU - Hiraga, K.

AU - Syono, Y.

AU - Muto, Y.

PY - 1988/10/1

Y1 - 1988/10/1

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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10.1016/0921-4534(88)90763-0