Journal article
Upper critical magnetic fields in single crystal MgB2
Superconductor science & technology, v 16(2), pp 193-198
01 Feb 2003
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Abstract
The upper critical field H-c2 for the fields perpendicular and parallel to Mg and B planes of the magnesium diboride is presented in the temperature range from 5.4 K up to T-c as obtained by comparison of high-field magnetotransport, ac-susceptibility and specific heat measurements. The onset of the finite resistivity yields H-c2, while the end of the resistive transition to the normal state is due to surface effects. H-c2 perpendicular to the planes reveals a conventional temperature dependence with mu(0)H(c2perpendicular toab)(0) = 3.5 T but the parallel critical field with mu(0)H(c2parallel toab)(0) = 17 T has a positive curvature at temperatures above 20 K. Consequently, the anisotropy factor Gamma = H-c2parallel toab/H-c2perpendicular toab is temperature dependent with Gamma equal to 4.8 at low temperatures and about 2 near T-c. The angular dependence of the upper critical field of an elliptic form is obtained at several temperatures.
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Details
- Title
- Upper critical magnetic fields in single crystal MgB2
- Creators
- L Lyard - Atomic Energy and Alternative Energies CommissionP Samuely - Slovak Academy of SciencesP Szabo - Slovak Academy of SciencesC Marcenat - Atomic Energy and Alternative Energies CommissionT Klein - Laboratoire d'Etudes des Propriétés Electroniques des Solides, Centre National de la Recherche Scientifique, BP 166, F-38042 Grenoble Cedex 9,FranceKHP Kim - Pohang University of Science and TechnologyC U Jung - Pohang University of Science and TechnologyH S Lee - Pohang University of Science and TechnologyB Kang - Pohang University of Science and TechnologyS Choi - Pohang University of Science and TechnologyS I Lee - Pohang University of Science and TechnologyL Paulius - Atomic Energy and Alternative Energies CommissionJ Marcus - Laboratoire d'Etudes des Propriétés Electroniques des Solides, Centre National de la Recherche Scientifique, BP 166, F-38042 Grenoble Cedex 9,FranceS Blanchard - Laboratoire d'Etudes des Propriétés Electroniques des Solides, Centre National de la Recherche Scientifique, BP 166, F-38042 Grenoble Cedex 9,FranceAGM JansenU Welp - Argonne National LaboratoryG Karapetrov - Argonne National LaboratoryW K Kwok - Argonne National Laboratory
- Publication Details
- Superconductor science & technology, v 16(2), pp 193-198
- Publisher
- Iop Publishing Ltd
- Number of pages
- 6
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000181335600013
- Scopus ID
- 2-s2.0-0037321616
- Other Identifier
- 991019295181404721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Applied
- Physics, Condensed Matter