The superconductive critical temperature and the electronic specific heat of impur1e tin

Lynton, Ernest A.; Serin, B.; Zucker, M.

doi:10.1016/0022-3697(57)90021-5

Cited by 129 publications

(23 citation statements)

References 14 publications

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“…The B values derived for transition metal impurities cannot be explained by (10). If we assume that a and P are the same constants for transition and nontransition metal impurities-and we cannot see any reason for the contrary-the B values calculated by (10) are much smaller than the experimental values even if we take a value for Az as large as -3.…”

Section: (4)mentioning

confidence: 75%

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Effect of Transition-Metal Impurities on the Critical Temperature of Superconducting Al, Zn, In, and Sn

1966

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The depression in critical temperature T c of several dilute solid solutions of transition elements in Al, Zn, In, and Sn was measured as a function of residual resistivity and concentration. In Zn-Mn and Zn-Cr, localized moments are present and T c decreases linearly with concentration with a slope -dT c /dc of 315 and 170°K/at.%, respectively. By comparing these numbers with theory, a value of about 1.4 eV was found for the s-d exchange integral. In all other alloys, the critical temperature is still depressed but much less than in Zn-Mn and Zn-Cr, and the depression becomes less rapid with increasing concentration of impurities. However, no saturation is found up to the maximum concentrations reached. The effect here found is different from that taking place in dilute alloys containing nontransition metals in that the depression of T c is larger, giving rise to suppression of superconductivity at sufficiently high impurity concentration. An analysis of the data for Al-Mn, Al-Cr, Al-Fe, Zn-Fe, Zn-Co, and Zn-Ni shows that in these systems the observed decrease of T c is satisfactorily accounted for by the smoothing out of the gap anisotropy and by the formation of localized virtual states, whose effect on the superconducting properties has been studied theoretically by Zuckermann. In-Mn and Sn-Mn do not fit the foregoing picture; however, the results obtained rule out the presence of magnetic moments in these two systems in bulk form. The apparent contrast with the results obtained in thin films is discussed. Some results on ternary alloys are also reported. It is shown that no effect on the critical temperature of In-Mn dilute solutions is produced by the addition of Pb.

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Section: (4)mentioning

confidence: 75%

“…[10][11][12] The major decrease of T c is limited to the dilute concentration range of the impurities, and is related to the smoothing out of the anisotropy of the effective electron-electron interaction leading to superconductivity. This fact was suggested by Anderson,13 and the theory was worked out by various authors.…”

Section: X48mentioning

confidence: 99%

Effect of Transition-Metal Impurities on the Critical Temperature of Superconducting Al, Zn, In, and Sn

1966

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“…In cases where the electron concentration was not expected to change much in the alloying process, they found T, values comparable to those of the pure materials. Lynton et al (1957) systematically studied the eff'ect of very small (-0.1 at. %%uo )amount sof impuritie s on the T, of Sn, starting from single crystals.…”

Section: Transport Propertiesmentioning

confidence: 99%

The Anderson-Mott transition

1994

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The interacting disordered electron problem is reviewed with emphasis on the quantum phase transitions that occur in a model system and on the field-theoretic methods used to describe them. An elementary discussion of conservation laws and diffusive dynamics is followed by a detai1ed derivation of the extended nonlinear sigma model, which serves as an effective field theory for the problem. A general scaling theory of metal-insulator and related transitions is developed, and explicit renormalization-group calculations for the various universality classes are reviewed and compared with experimental results. A discussion of pertinent physical ideas and phenomenological approaches to the metal-insulator transition not contained in the sigma-model approach is given, and phase-transition aspects of related problems, like disordered superconductors and the quantum Hall effect, are discussed. The review concludes with a list of open problems.

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“…ρ is defined in the original paper as R 0 /[(R-R 0 )(1-αt c )], which is proportional to the impurity concentration. (Lynton et al, 1957) …”

Section: Non-magnetic Impuritiesmentioning

confidence: 99%

“…However, it doesn't account for changes of T c for conventional superconductors with addition of impurities (Lynton et al, 1957;Chanin et al, 1959;Nakamura, 1959;Gayley et al, 1962;Markowitz and Kadanoff, 1963;Ginsberg, 1964;Hohenberg, 1964). Figure 2.7 presents typical data for three different impurities in tin (Lynton et al, 1957). To explain the curves in Fig.…”

Section: Non-magnetic Impuritiesmentioning

confidence: 99%

Combined effects of post-growth thermal treatment and chemical substitution on physical properties of CaFe<sub>2</sub>As<sub>2</sub>

Ran

2014

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The superconductive critical temperature and the electronic specific heat of impur1e tin

Cited by 129 publications

References 14 publications

Effect of Transition-Metal Impurities on the Critical Temperature of Superconducting Al, Zn, In, and Sn

Effect of Transition-Metal Impurities on the Critical Temperature of Superconducting Al, Zn, In, and Sn

The Anderson-Mott transition

Combined effects of post-growth thermal treatment and chemical substitution on physical properties of CaFe<sub>2</sub>As<sub>2</sub>

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