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Magnetic susceptibility and superconductivity of cubic vanadium nitrides
The superconducting transition temperature T C and the magnetic susceptibility from 77 to 300°K have been measured on five cubic vanadium nitrides: VN, VN 0.91, VN 0.82, VN 0.84 and VN 0.75. The materials were carefully prepared to exclude oxygen and ferromagnetic impurities. The value of T C , fall...
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| Published in: | The Journal of physics and chemistry of solids 1975, Vol.36 (1), p.7-15 |
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| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | The superconducting transition temperature
T
C
and the magnetic susceptibility from 77 to 300°K have been measured on five cubic vanadium nitrides: VN, VN
0.91, VN
0.82, VN
0.84 and VN
0.75. The materials were carefully prepared to exclude oxygen and ferromagnetic impurities.
The value of
T
C
, falls from 8.1°K for VN to 2.3°K for VN
0.75. The mass-susceptibility decreases from +3.94 × 10
−6
e.
m.
u./
g for VN to 1.88 × 10
−6
e.
m.
u./
g for VN
0.75 at 300°K. All samples showed a small positive slope for the susceptibility temperature curve.
The results are discussed in terms of the rigid band model. The main features are a high density of states of d electrons, 2.4 states/atom eV for VN that drops off as the nitrogen content decreases, to 0.8 states/atom eV.
Preliminary considerations indicate that many-body effects could reduce this density of states by as much as a factor of 2. Lack of experimental results on Knight shifts and low-temperature specific heats prevent a more quantitative estimate being made. |
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| ISSN: | 0022-3697 1879-2553 |
| DOI: | 10.1016/0022-3697(75)90124-9 |