NDLI: Potentiality for Low Temperature—High Field Application of Iron Chalcogenide Thin Films

Content Provider	IEEE Xplore Digital Library
Author	Kawale, S. Bellingeri, E. Braccini, V. Buzio, R. Gerbi, A. Sala, A. Reich, E. Holzapfel, B. Adamo, M. Sarnelli, E. Tarantini, C. Putti, M. Ferdeghini, C.
Copyright Year	2002
Abstract	Among the various families of Fe-based superconductors, iron chalcogenides, while presenting a transition temperature not particularly high, show great advantages for potential applications at high fields, albeit at liquid helium temperature. In fact, the critical temperature can be increased by stress up to 21 K in thin films, moreover stress can push the critical field up to more than 50 T, and the irreversibility field up to of 45 T. Also critical current densities higher than 1 MA/cm² can be reached in self field and at 4.2 K, with a very weak dependence on the magnetic field. Interestingly, the J_C anisotropy depends on the mode of growth and substrate used. These high values of J_C can be achieved without appreciable anisotropy. In this work, we present an overview of Fe(Se_0.5Te_0.5) thin film deposition by pulsed laser ablation, and a study of their superconducting properties. STM and TEM techniques have been used to characterise structural and morphological properties and, thus, pinning centres. On different substrates the films grow with different types of defects, hence giving totally different J_C anisotropy. Our preliminary measurements on a Josephson junction show that in Fe(Se,Te), the J_C at the grain boundary is not severely depressed, which makes this material even more interesting from the practical point of view.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1
Ending Page	5
Page Count	5
File Size	862331
File Format	PDF
ISSN	10518223
Volume Number	25
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Substrates Superconductivity Magnetic fields Temperature measurement Grain boundaries Epitaxial growth superconducting thin films Critical current density flux pinning laser ablation strain control
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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