TY - JOUR
T1 - Anisotropy and temperature dependence of H c2 in layer superconductor
T2 - Pure and Fe-doped 2 H-NbSe2
AU - Muto, Y.
AU - Noto, K.
AU - Nakatsuji, H.
AU - Toyota, N.
PY - 1977/4/1
Y1 - 1977/4/1
N2 - The positive curvature of the upper critical field H c2{norm of matrix} (parallel to the layer) and the temperature dependence of the ratio, H c2{norm of matrix}/H c2⊥, observed in pure NbSe2 can be accounted for by the Takanaka theory which includes anisotropies of both the Fermi velocity and the energy gap and the effect of nonlocality. In Fe-doped samples, the ratio H c2{norm of matrix}/H c2⊥ becomes almost constant, showing higher anisotropy than pure NbSe2 at higher-temperature region. The resistance anomaly observed around 30 K in pure NbSe2, which is believed to originate from the charge density wave (CDW) formation, is suppressed more rapidly than superconductivity by the addition of Fe impurities.
AB - The positive curvature of the upper critical field H c2{norm of matrix} (parallel to the layer) and the temperature dependence of the ratio, H c2{norm of matrix}/H c2⊥, observed in pure NbSe2 can be accounted for by the Takanaka theory which includes anisotropies of both the Fermi velocity and the energy gap and the effect of nonlocality. In Fe-doped samples, the ratio H c2{norm of matrix}/H c2⊥ becomes almost constant, showing higher anisotropy than pure NbSe2 at higher-temperature region. The resistance anomaly observed around 30 K in pure NbSe2, which is believed to originate from the charge density wave (CDW) formation, is suppressed more rapidly than superconductivity by the addition of Fe impurities.
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U2 - 10.1007/BF02723523
DO - 10.1007/BF02723523
M3 - Article
AN - SCOPUS:51649158041
VL - 38
SP - 503
EP - 510
JO - Il Nuovo Cimento B Series 10
JF - Il Nuovo Cimento B Series 10
SN - 1594-9982
IS - 2
ER -