Magnetization of Gd diffused Yba2Cu3O7-x superconductor：Experiment and theory

doi:10.1088/1674-1056/22/7/077402

中国物理B ›› 2013, Vol. 22 ›› Issue (7): 77402-077402.doi: 10.1088/1674-1056/22/7/077402

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Magnetization of Gd diffused Yba₂Cu₃O_7-x superconductor：Experiment and theory

F. Inanira^a, Ş. Yildizb^b, K. Ozturkc^c, S. Celebic^c

a Department of Physics, Art and Science Faculty, Recep Tayyip Erdogan University, 53100, Rize, Turkey;
b Department of Metallurgical and Materials Engineering, Ahi Evran University, 40100, K?rsehir, Turkey;
c Department of Physics, Karadeniz Technical University, 61000, Trabzon, Turkey

收稿日期:2012-05-22 修回日期:2013-01-18 出版日期:2013-06-01 发布日期:2013-06-01

Magnetization of Gd diffused Yba₂Cu₃O_7-x superconductor：Experiment and theory

F. Inanira^a, Ş. Yildizb^b, K. Ozturkc^c, S. Celebic^c

a Department of Physics, Art and Science Faculty, Recep Tayyip Erdogan University, 53100, Rize, Turkey;
b Department of Metallurgical and Materials Engineering, Ahi Evran University, 40100, K?rsehir, Turkey;
c Department of Physics, Karadeniz Technical University, 61000, Trabzon, Turkey

Received:2012-05-22 Revised:2013-01-18 Online:2013-06-01 Published:2013-06-01
Contact: Ş. Yildizb E-mail:sukruyldz@gmail.com

摘要/Abstract

摘要： The magnetization of Gd diffused YBa₂Cu₃O_7-x is measured by a vibrating sample magnetometer (VSM) at selected temperatures (5, 25, 50, 77 K). The experimental results for the magnetization are analyzed in the critical state framework involving Kim-Anderson field dependence J_c(H) = J_c0/(1+|H>|/H₀)ⁿ of critical current density and equilibrium magnetization M_eq. It is found that the inclusion of the equilibrium magnetization becomes more important at higher temperatures. At 77 K, the shape of the isothermal M-H hysteresis curve is governed by the equilibrium magnetization. Some superconducting parameters are determined by fitting the calculated curves to the experimental data.

关键词: type-II superconductor, YBCO, surface effect, equilibrium magnetization, critical-state model

Abstract: The magnetization of Gd diffused YBa₂Cu₃O_7-x is measured by a vibrating sample magnetometer (VSM) at selected temperatures (5, 25, 50, 77 K). The experimental results for the magnetization are analyzed in the critical state framework involving Kim-Anderson field dependence J_c(H) = J_c0/(1+|H>|/H₀)ⁿ of critical current density and equilibrium magnetization M_eq. It is found that the inclusion of the equilibrium magnetization becomes more important at higher temperatures. At 77 K, the shape of the isothermal M-H hysteresis curve is governed by the equilibrium magnetization. Some superconducting parameters are determined by fitting the calculated curves to the experimental data.

Key words: type-II superconductor, YBCO, surface effect, equilibrium magnetization, critical-state model

中图分类号: (Granular, melt-textured, amorphous, and composite superconductors)

74.81.Bd

74.25.Ha (Magnetic properties including vortex structures and related phenomena) 74.25.Wx (Vortex pinning (includes mechanisms and flux creep))

F. Inanira, Ş. Yildizb, K. Ozturkc, S. Celebic. Magnetization of Gd diffused Yba₂Cu₃O_7-x superconductor：Experiment and theory[J]. 中国物理B, 2013, 22(7): 77402-077402.

F. Inanira, Ş. Yildizb, K. Ozturkc, S. Celebic. Magnetization of Gd diffused Yba₂Cu₃O_7-x superconductor：Experiment and theory[J]. Chin. Phys. B, 2013, 22(7): 77402-077402.

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Magnetization of Gd diffused Yba₂Cu₃O_7-x superconductor：Experiment and theory

Magnetization of Gd diffused Yba₂Cu₃O_7-x superconductor：Experiment and theory

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