Structural distortion and suppression of superconductivity in stoichiometric B1-MoN epitaxial thin films
Physical Review B - Condensed Matter and Materials Physics Volume 73 Issue 5
Page 052504-
published_at 2006
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Title ( eng ) |
Structural distortion and suppression of superconductivity in stoichiometric B1-MoN epitaxial thin films
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Creator |
Baba Kazuya
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Source Title |
Physical Review B - Condensed Matter and Materials Physics
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Volume | 73 |
Issue | 5 |
Start Page | 052504 |
Abstract |
Molybdenum nitride films with the NaCl structure (B1-MoN) were epitaxially grown on α- Al2 O3 (001) and MgO(001) substrates at 973 K by pulsed laser deposition (PLD) under nitrogen radical irradiation. The highly crystalline epitaxial films enabled us to determine the three-dimensional cell parameters, which was motivated by theoretical calculations that B1-MoN, a predicted superconductor, is elastically unstable against tetragonal and trigonal distortions. On α- Al2 O3 (001), the B1-MoN phase (composition, Mo1 N0.98) was grown with its (111) planes parallel to the substrate surface. X-ray diffraction analysis with a multiaxes diffractometer detected only a small trigonal lattice distortion [a=0.4219(3) nm, α=89.28(5)°] with an expansion along the [111] direction perpendicular to the substrate surface. The film grown on MgO(001) had the MoN1.03 composition and showed a slight tetragonal distortion (a=0.4213 and c=0.424 nm) due to fitting to the MgO substrate lattice (a=0.4213 nm). These two stoichiometric films showed no superconductivity above 2 K. A lower nitrogen content (MoN0.86) film was obtained on α- Al2 O3 (001) using a higher deposition rate. The corresponding film had a much smaller lattice constant [a=0.4184(3) nm], and a similar distortion [α=89.41(5)°]. The B1- MoN0.86 film showed superconductivity with a transition temperature Tc =4.2 K. The suppression of the superconductivity of the former stoichiometric phase can be interpreted in terms of the lattice expansion.
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NDC |
Physics [ 420 ]
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Language |
eng
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Resource Type | journal article |
Publisher |
American Physical Society
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Date of Issued | 2006 |
Rights |
Copyright (c) 2006 American Physical Society
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Publish Type | Version of Record |
Access Rights | open access |
Source Identifier |
[NCID] AA11187113
[ISSN] 1098-0121
[DOI] 10.1103/PhysRevB.73.052504
[DOI] http://dx.doi.org/10.1103/PhysRevB.73.052504
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