NDLI: Upper critical fields up to 60 T in dirty magnesium diboride thin films

Content Provider	IEEE Xplore Digital Library
Author	Ferdeghini, C. Ferrando, V. Tarantini, C. Bellingeri, E. Grasso, G. Malagoli, A. Marre, D. Putti, M. Manfrinetti, P. Pogrebnyakov, A. Redwing, J.M. Xi, X.X. Felici, R. Haanappel, E.
Copyright Year	2002
Abstract	Upper critical fields of several magnesium diboride thin films were measured up to 28 T at the Grenoble High Magnetic Field Laboratory (GHMFL) in Grenoble and up to 60 T at the Laboratoire National des Champs Magne/spl acute/tiques Pulse/spl acute/s (LNCMP) in Toulouse. The samples were prepared both by pulsed laser deposition (PLD) and hybrid physical chemical vapor deposition (HPCVD) technique; they have critical temperatures between 29 and 39 K and normal state resistivities between 5 and 250 /spl mu//spl Omega/ cm; one of them has been intentionally doped with carbon. The measured critical fields, /spl mu//sub 0/H/sub c2/, were exceptionally high; we obtained the record value of 52 T at 4.2 K in the parallel orientation. In contrast with the BCS predictions, no saturation in H/sub c2/ at low temperature was observed. Furthermore, films with a wide range of resistivity values showed similar critical fields, suggesting that in a two band system resistivity and H/sub c2/ are not trivially linked. The high H/sub c2/ values seem to be related with the expanded c-axis. The structure of one of the samples was carefully investigated with X-ray diffraction at European Synchrotron Radiation Facility (ESRF) in Grenoble.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3234
Ending Page	3237
Page Count	4
File Size	288415
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnesium compounds Transistors Magnetic field measurement Conductivity Pulse measurements Pulsed laser deposition Temperature Magnetic films Laboratories Optical pulses thin films Critical fields high magnetic fields synchrotron radiation
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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