Specific heat of Nb 3 Sn : The case for a second energy gap. Guritanu, V., Goldacker, W., Bouquet, F., Wang, Y., Lortz, R., Goll, G., & Junod, A. Physical Review B, 70(18):184526, 11, 2004.
abstract   bibtex   
We present specific-heat data for Nb3Sn, a well-known technically applied superconductor with a critical temperature Tc ≅ 18 K, in the temperature range from 1.2 to 200 K in zero magnetic field, and from 1.5 to 22 K in fields H ≤ 16 T. The particularly dense and homogeneous polycrystalline sample used for this study is characterized in detail. We determine the bulk upper critical field Hc2(T) from specific-heat data, and the Sommerfeld constant γ from the entropy S(T). We investigate in detail a low-temperature anomaly already noticed in previous investigations in zero field, and find that this feature can be quantitatively ascribed to the presence of a second superconducting gap 2ΔS(0) ≅ 0.8kBTc, in addition to the main one 2ΔL(0) ≅ 4.9kBTc. The signature of this minor gap, which affects 7.5% of the electronic density-of-states, vanishes in high fields.
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 title = {Specific heat of Nb 3 Sn : The case for a second energy gap},
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 year = {2004},
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 month = {11},
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 abstract = {We present specific-heat data for Nb3Sn, a well-known technically applied superconductor with a critical temperature Tc ≅ 18 K, in the temperature range from 1.2 to 200 K in zero magnetic field, and from 1.5 to 22 K in fields H ≤ 16 T. The particularly dense and homogeneous polycrystalline sample used for this study is characterized in detail. We determine the bulk upper critical field Hc2(T) from specific-heat data, and the Sommerfeld constant γ from the entropy S(T). We investigate in detail a low-temperature anomaly already noticed in previous investigations in zero field, and find that this feature can be quantitatively ascribed to the presence of a second superconducting gap 2ΔS(0) ≅ 0.8kBTc, in addition to the main one 2ΔL(0) ≅ 4.9kBTc. The signature of this minor gap, which affects 7.5% of the electronic density-of-states, vanishes in high fields.},
 bibtype = {article},
 author = {Guritanu, V. and Goldacker, W. and Bouquet, F. and Wang, Y. and Lortz, R. and Goll, G. and Junod, A.},
 journal = {Physical Review B},
 number = {18}
}
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