Restricted reversible region and strongly enhanced pinning in MPMG YBa2Cu3O7 with Y2BaCuO5 inclusions

L. T. Sagdahl; T. Lægreid; K. Fossheim; M. Murakami; H. Fujimoto; S. Gotoh; K. Yamaguchi; H. Yamauchi; N. Koshizuka; S. Tanaka

doi:10.1016/0921-4534(91)90220-S

Restricted reversible region and strongly enhanced pinning in MPMG YBa₂Cu₃O₇ with Y₂BaCuO₅ inclusions

L. T. Sagdahl, T. Lægreid, K. Fossheim, M. Murakami, H. Fujimoto, S. Gotoh, K. Yamaguchi, H. Yamauchi, N. Koshizuka, S. Tanaka

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Recent work has shown that the melt-powder-melt-grown (MPMG) high temperature superconductor YBa₂Cu₃O₇ with Y₂BaCuO₅ inclusions sustains unusually high critical current in the bulk. In the present paper the magnetic irreversibility line of this material is studied by AC permeability measurements. The irreversibility line is much steeper and is moved to higher temperatures compared to single crystal YBa₂Cu₃O₇ and the reversible region between the irreversibility line and the H_c2 line is drastically shrunk. From standard flux creep analysis the pinning energy is found to be increased by one order of magnitude as compared to YBa₂Cu₃O₇. The measurements further show that the irreversibility temperature increases in a simple logarithmic fashion with increasing frequency. The magnetic AC field response is found to be highly nonlinear even when B_ac B_dc∼10^-5.

Original language	English
Pages (from-to)	495-500
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	172
Issue number	5-6
DOIs	https://doi.org/10.1016/0921-4534(91)90220-S
Publication status	Published - 1991 Jan 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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Restricted reversible region and strongly enhanced pinning in MPMG YBa₂Cu₃O₇ with Y₂BaCuO₅ inclusions. / Sagdahl, L. T.; Lægreid, T.; Fossheim, K.; Murakami, M.; Fujimoto, H.; Gotoh, S.; Yamaguchi, K.; Yamauchi, H.; Koshizuka, N.; Tanaka, S.

In: Physica C: Superconductivity and its applications, Vol. 172, No. 5-6, 01.01.1991, p. 495-500.

Research output: Contribution to journal › Article › peer-review

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abstract = "Recent work has shown that the melt-powder-melt-grown (MPMG) high temperature superconductor YBa2Cu3O7 with Y2BaCuO5 inclusions sustains unusually high critical current in the bulk. In the present paper the magnetic irreversibility line of this material is studied by AC permeability measurements. The irreversibility line is much steeper and is moved to higher temperatures compared to single crystal YBa2Cu3O7 and the reversible region between the irreversibility line and the Hc2 line is drastically shrunk. From standard flux creep analysis the pinning energy is found to be increased by one order of magnitude as compared to YBa2Cu3O7. The measurements further show that the irreversibility temperature increases in a simple logarithmic fashion with increasing frequency. The magnetic AC field response is found to be highly nonlinear even when Bac Bdc∼10-5.",

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AU - Sagdahl, L. T.

AU - Lægreid, T.

AU - Fossheim, K.

AU - Murakami, M.

AU - Fujimoto, H.

AU - Gotoh, S.

AU - Yamaguchi, K.

AU - Yamauchi, H.

AU - Koshizuka, N.

AU - Tanaka, S.

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N2 - Recent work has shown that the melt-powder-melt-grown (MPMG) high temperature superconductor YBa2Cu3O7 with Y2BaCuO5 inclusions sustains unusually high critical current in the bulk. In the present paper the magnetic irreversibility line of this material is studied by AC permeability measurements. The irreversibility line is much steeper and is moved to higher temperatures compared to single crystal YBa2Cu3O7 and the reversible region between the irreversibility line and the Hc2 line is drastically shrunk. From standard flux creep analysis the pinning energy is found to be increased by one order of magnitude as compared to YBa2Cu3O7. The measurements further show that the irreversibility temperature increases in a simple logarithmic fashion with increasing frequency. The magnetic AC field response is found to be highly nonlinear even when Bac Bdc∼10-5.

AB - Recent work has shown that the melt-powder-melt-grown (MPMG) high temperature superconductor YBa2Cu3O7 with Y2BaCuO5 inclusions sustains unusually high critical current in the bulk. In the present paper the magnetic irreversibility line of this material is studied by AC permeability measurements. The irreversibility line is much steeper and is moved to higher temperatures compared to single crystal YBa2Cu3O7 and the reversible region between the irreversibility line and the Hc2 line is drastically shrunk. From standard flux creep analysis the pinning energy is found to be increased by one order of magnitude as compared to YBa2Cu3O7. The measurements further show that the irreversibility temperature increases in a simple logarithmic fashion with increasing frequency. The magnetic AC field response is found to be highly nonlinear even when Bac Bdc∼10-5.

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