NDLI: Re−Ni$_{2}$B$_{2}$C superconducting borocarbides: “In situ” growth of thin films, transport and point contact spectroscopy

Content Provider	Springer Nature Link
Author	Andreone, A. Fontana, F. Iavarone, M. Salluzzo, M. Vaglio, R.
Copyright Year	1997
Abstract	High quality c-axis oriented films of the intriguing intermetallic superconducting compound YNi$_{2}$B$_{2}$C have been obtained “in situ” by magnetron sputtering on MgO substrates held at about 800°C. The films showed maximum T$_{c}$=15.3 K, †T$_{c}$≈0.1 K, room temperature resistivity ρ≈50μΩ·cm, critical current J$_{c}$≈10$^{5}$ A/cm$^{2}$ and B$_{c2}$≈6 T. Superconducting films were also obtained on Al$_{2}$O$_{3}$ and LaAlO$_{3}$ single-crystal substrates. From the ρ(T) dependence a value of the Debye temperature Θ$_{ D }$=330±20 K can be deduced. At low temperatures the resistivity follows a quadratic power law possibly indicative of a high value of the electron-phonon interaction parameter λ. In order to clarify the role of λ in these compounds, point contact spectroscopy measurements have been performed on YNi$_{2}$B$_{2}$C and HoNi$_{2}$B$_{2}$C bulk samples prepared by inductive melting using a Low Temperature Scanning Tunneling Microscope (LTSTM). In the point contact regime clear evidence of a superconducting gap have been found in both compounds, corresponding to a moderate strong coupling behaviour (2†/KT$_{c}$≈3.8).
Starting Page	527
Ending Page	532
Page Count	6
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	107
Issue Number	5-6
e-ISSN	15737357
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1997-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Condensed Matter Magnetism, Magnetic Materials Characterization and Evaluation Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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