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Showing papers on "High-temperature superconductivity published in 1981"


Journal ArticleDOI
TL;DR: In this paper, the tunneling density of states of a $p$-wave super-conductor in a magnetic field was calculated, and particular features which allow experimental identification of the superconductors were discussed.
Abstract: Tunneling spectra of hypothetical $p$-wave and conventional $s$-wave superconductors are expected to differ significantly. There is a bulk effect which arises due to the differences in the structure of the Cooper pairs, and a surface effect, which dominates, and is associated with the interface of the tunnel junction. We calculate the tunneling density of states of a $p$-wave super-conductor in a magnetic field and discuss particular features which allow experimental identification of $p$-wave superconductors.

255 citations


Journal ArticleDOI
TL;DR: In this article, an expression of the effective phonon spectrum a 2 F(ω), spectrum area λ/2 and electron-phonon coupling constant A of the metal with valence Z in terms of a few parameters, such as average electronic radius r s, Ion mass M and sound velocity v j.
Abstract: The present paper gives an expression of the effective phonon spectrum a 2 F(ω),spectrum area λ/2 and electron-phonon coupling constant A of the metal with valence Z in terms of a few parameters, such as average electronic radius r s , Ion mass M and sound velocity v j . Using the formula of Dynes, we have calculated the superconducting transition temperature T c for matalic hydrogen, lead and niobium. It is shown that matalic hydrogen has λ = 2.55 and T c = 162 K at zero pressure.

5 citations


Journal ArticleDOI
TL;DR: In this paper, it was shown that in an antiferromagnetic superconductor the electronic density of states is modified to exhibit a deviation from the BCS theory due to the second-order process of the electron-magnon interaction.
Abstract: It is shown that in an antiferromagnetic superconductor the electronic density of states is modified to exhibit a deviation from the BCS theory due to the second-order process of the electron-magnon interaction. An electron tunneling experiment is proposed to detect this effect in existing antiferromagnetic superconductors. A close analogy is pointed out between the present electron-magnon system and the electron-phonon system of strong coupling superconductors.

5 citations


Journal ArticleDOI
TL;DR: In this article, it was shown that superconductivity above 8 K occurs in alloys and metallic compounds within relatively narrow regions of cohesive energy density with a sharp peak which includes Nb3Ge, SiV3, nb3Ga, and NbN.
Abstract: It is shown that superconductivity above 8 K occurs in alloys and metallic compounds within relatively narrow regions of cohesive energy density with a sharp peak which includes Nb3Ge, SiV3, Nb3Ga, and NbN. When cross-correlated with the electron-atom ratio, high-temperature superconductivity can be observed in only a few regions. This suggests a search for superconductors with high-transition temperatures and critical fields within these regions.