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

Research output: Contribution to journal › Article

28 Citations (Scopus)

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
Externally published	Yes

ASJC Scopus subject areas

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

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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.",

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

year = "1988",

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doi = "10.1016/0921-4534(88)90763-0",

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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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