The re-entrant superconducting-normal phase boundary of the Kondo system (, Ce)Al2

Maple, M. B.; Fertig, W.A.; Mota, A. C.; DeLong, L. E.; Wohlleben, D.; Fitzgerald, R. W.

doi:10.1016/0038-1098(72)90281-5

Cited by 131 publications

(41 citation statements)

References 10 publications

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“…The reen-trance may be understood as resulting from an increasing strength of the pair breaking of the paramagnetic impurities with decreasing temperature, because T K < T s (Müller-Hartmann and Zittartz, 1971). The strength of pair breaking due to Kondo screening was also studied in high pressure experiments on La 1−x Ce x alloys, where the superconductivity vanishes in a finite pressure interval for x = 0.02 as the Kondo temperature increases under pressure (Maple et al, 1972). As a side-effect of detailed studies in Ce 1−x La x Al 2 it was finally also recognized, that even pure CeAl 2 displays a Kondo-effect, thus qualifying as the perhaps first example of a Kondo-lattice (Buschow and van Daal, 1970;van Daal and Buschow, 1969;Maple, 1969).…”

Section: P Auli C2mentioning

confidence: 99%

“…Ce 1−x La x Al 2 displays reentrant superconductivity (Maple et al, 1972;Riblet and Winzer, 1971), i.e., the superconducting transition at T s1 is followed by a second characteristic temperature T s2 < T s1 below which superconductivity vanishes again. The reen-trance may be understood as resulting from an increasing strength of the pair breaking of the paramagnetic impurities with decreasing temperature, because T K < T s (Müller-Hartmann and Zittartz, 1971).…”

Section: P Auli C2mentioning

confidence: 99%

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Superconducting phases off-electron compounds

2009

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Intermetallic compounds containing f-electron elements display a wealth of superconducting phases, that are prime candidates for unconventional pairing with complex order parameter symmetries. For instance, superconductivity has been found at the border of magnetic order as well as deep within ferro-and antiferromagnetically ordered states, suggesting that magnetism may promote rather than destroy superconductivity. Superconductivity near valence transitions, or in the vicinity of magneto-polar order are candidates for new superconductive pairing interactions such as fluctuations of the conduction electron density or the crystal electric field, respectively. The experimental status of the study of the superconducting phases of f-electron compounds is reviewed.

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Section: P Auli C2mentioning

confidence: 99%

Section: P Auli C2mentioning

confidence: 99%

Superconducting phases off-electron compounds

2009

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“…3 [17]. Zur Homogenisierung und zum Abbau der Spannungen wurden die Proben nach einem yon Maple [4] angegebenen Veffahren getempert.…”

Section: Iii1 Normalleitender Zustandunclassified

“…Mit dem System L(La, Ce)A12 ist es erstmals gelungen, eine auffallende Kondo-Anomalie im supraleitenden Zustand zu zeigen [3,4] und damit die theoretischen Voraussagen yon Miiller-Hartmann und Zittartz [5] experimentell teilweise zu bestgtigen. Die Theorie des KondoEffektes sagt eine stark temperaturabNingige Amplitude der Spin-flipStreuung voraus.…”

Section: Introductionunclassified

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Die elektrischen Eigenschaften des Kondo-Supraleiters (La, Ce)Al2

Winzer

1973

Z. Physik

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The Electrical Properties of the Kondo-Superconductor L(_L_ ~, Ce)A12In the ternary alloy (La, Ce)A12 the Kondo anomalies due to the Cerium impurities are studied in the normal and superconducting state. A vanishing of superconductivity in certain (La, Ce)A12 alloys below a second transition temperature has been observed for the narrow range of 0.6-0.7 at% Ce-additions. The transition back into the norreal state has been observed by means of dc-conductivity and low frequency mutual inductance measurements down to 30 inK. Curves of the upper critical field versus temperature show a maximum at finite temperatures even for lower Ce-concentrations. The temperature dependence of the pair-breaking parameter has been deduced empiricaily from the upper critical field curves, assuming additive pair breaking theory. In contradiction to the theory no decrease of the pair-breaking parameter for T-* 0 can be observed. Therefore the reentrance of superconductivity at ultra low temperatures cannot be expected.

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