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Title: Tunneling, resistive and structural study of NbN and other superconducting nitrides

Abstract

A straightforward method for producing metal nitrides, which we call Thin Film Diffusion (TFD), has been developed. With this technique we produced films of cubic nitrides (NbN, ZrN, VN, TiN) with superconducting transition temperatures up to 17.25K in NbN (equal to the highest known in this material), and up to 9.4K in VN (0.6K higher than the highest previously reported value). Resistive transitions are less than 0.1K in width, indicating, together with x-rays, that the samples are homogeneous and essentially single B1 phase. In NbN the relatively low resistivity /rho/(20K) = 65..mu cap omega..cm and metallic resistance ratio /rho/(300K)//rho/(20K) = 1.2 were found. TFD films open up new possibilities in tunneling and other experiments on cubic nitrides. Our present results include determination of the strong coupling parameter 2..delta..(0)/kT /SUB c/ = 4.31 and of the electron-phonon coupling function ..cap alpha../sup 2/F(..omega..) in NbN. ..cap alpha../sup 2/F(..omega..) is found to have a peak at about 13 meV, which explains the strong-coupling nature of NbN. In resistive studies we found an interesting similarity between the low temperature resistivity behavior of cubic nitrides and A-15 superconductors.

Authors:
; ; ; ;
Publication Date:
Research Org.:
ATandT Bell Laboratories, Murray Hill, New Jersey
OSTI Identifier:
6340317
Report Number(s):
CONF-840937-
Journal ID: CODEN: IEMGA
Resource Type:
Conference
Journal Name:
IEEE Trans. Magn.; (United States)
Additional Journal Information:
Journal Volume: MAG 21:2; Conference: Applied superconductivity conference, San Diego, CA, USA, 9 Sep 1984
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; NIOBIUM NITRIDES; FABRICATION; TUNNEL EFFECT; TITANIUM NITRIDES; VANADIUM NITRIDES; ZIRCONIUM NITRIDES; CRYSTAL GROWTH; CRYSTAL STRUCTURE; CRYSTAL-PHASE TRANSFORMATIONS; CRYSTALLOGRAPHY; SUPERCONDUCTING FILMS; SUPERCONDUCTIVITY; TRANSITION HEAT; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ENTHALPY; FILMS; NIOBIUM COMPOUNDS; NITRIDES; NITROGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; PNICTIDES; REFRACTORY METAL COMPOUNDS; THERMODYNAMIC PROPERTIES; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; VANADIUM COMPOUNDS; ZIRCONIUM COMPOUNDS; 420201* - Engineering- Cryogenic Equipment & Devices; 360101 - Metals & Alloys- Preparation & Fabrication; 360104 - Metals & Alloys- Physical Properties

Citation Formats

Gurvitch, M, Greerk, J, Lowe, W P, Remeika, J P, and Rowell, J M. Tunneling, resistive and structural study of NbN and other superconducting nitrides. United States: N. p., 1985. Web.
Gurvitch, M, Greerk, J, Lowe, W P, Remeika, J P, & Rowell, J M. Tunneling, resistive and structural study of NbN and other superconducting nitrides. United States.
Gurvitch, M, Greerk, J, Lowe, W P, Remeika, J P, and Rowell, J M. 1985. "Tunneling, resistive and structural study of NbN and other superconducting nitrides". United States.
@article{osti_6340317,
title = {Tunneling, resistive and structural study of NbN and other superconducting nitrides},
author = {Gurvitch, M and Greerk, J and Lowe, W P and Remeika, J P and Rowell, J M},
abstractNote = {A straightforward method for producing metal nitrides, which we call Thin Film Diffusion (TFD), has been developed. With this technique we produced films of cubic nitrides (NbN, ZrN, VN, TiN) with superconducting transition temperatures up to 17.25K in NbN (equal to the highest known in this material), and up to 9.4K in VN (0.6K higher than the highest previously reported value). Resistive transitions are less than 0.1K in width, indicating, together with x-rays, that the samples are homogeneous and essentially single B1 phase. In NbN the relatively low resistivity /rho/(20K) = 65..mu cap omega..cm and metallic resistance ratio /rho/(300K)//rho/(20K) = 1.2 were found. TFD films open up new possibilities in tunneling and other experiments on cubic nitrides. Our present results include determination of the strong coupling parameter 2..delta..(0)/kT /SUB c/ = 4.31 and of the electron-phonon coupling function ..cap alpha../sup 2/F(..omega..) in NbN. ..cap alpha../sup 2/F(..omega..) is found to have a peak at about 13 meV, which explains the strong-coupling nature of NbN. In resistive studies we found an interesting similarity between the low temperature resistivity behavior of cubic nitrides and A-15 superconductors.},
doi = {},
url = {https://www.osti.gov/biblio/6340317}, journal = {IEEE Trans. Magn.; (United States)},
number = ,
volume = MAG 21:2,
place = {United States},
year = {1985},
month = {3}
}

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