Magnetization and microwave study of superconducting MgB2

Dulčić, Antonije and Paar, Dalibor and Požek, Miroslav and Williams, G. V. M. and Kramer, S. and Jung, C. U. and Park, Min-Seok and Lee, Sung-Ik (2002) Magnetization and microwave study of superconducting MgB2. Physical Review B, 66 (1). pp. 14505-7. ISSN 1098-0121

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We report magnetic-field-dependent magnetization and microwave impedance measurements on a MgB2 superconductor prepared by high-pressure synthesis. We find that the upper critical field is linearly dependent on temperature near Tc and the dc irreversibility field exponent is ∼1.4. Microwave surface impedance measurements were carried out in applied magnetic fields up to 8 T. The low-field data show an absence of weak links in the superconducting state. By inverting the surface impedance data, we find a vortex depinning frequency that decreases with increasing magnetic field, which is characteristic of collective pinning.

Item Type: Article
Keywords: critical-current density, upper critical-field, high-pressure, penetration depth, vortex dynamics, temperature, films, transport, frequency, cavity, microwave
Date: June 2002
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2002) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 0119275
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 23 May 2014 07:01
Last Modified: 23 May 2014 07:01

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