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Probable observation of «excitonic» superconductivity in formvar-aluminum sandwiches

Вероятностное наблюдение «экситонной» сверхпроводимости в формваралюминиевых сэндвичах

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Il Nuovo Cimento B (1971-1996)

Summary

The Ginzburg's «generalized jellium» model of the proximity effect in superconductor-dielectric systems is tested against a wide phenomenology occurring in formvar-metal multilayers. The experimental evidence gained from enhanced superconductivity, critical magnetic fields, energy gap and pair-breaking parameter values seems to support the hypothesis that a formvar eigenfrequency plays the same role as the Debye frequency in setting up the superconductivity of these systems.

Riassunto

Il modello a «jellium generalizzato» di Ginzburg per gli effetti di prossimità in sistemi superconduttore-dielettrico è verificato sulla base di un'ampia fenomenologia che si manifesta in sistemi a più strati formvar-metallo. La prova sperimentale ottenuta da vari dati indipendenti (campi magnetici critici, innalzamento della temperatura critica, valori della «gap» di energia e del parametro di «pair-breaking») sembra appoggiare l'ipotesi che un'autofrequenza del formvar giuochi lo stesso ruolo della frequenza di Debye nell'instaurare la superconduttività in tali sistemi.

Резюме

Обобщенная модель Гинзбурга для эффекта «близости» в системах сверхпроводник-диэлектрик проверяется на экспериментальных фактах, имеющих место в многослойных образцах «формвар-металл». Экспериментальное подтверждение увеличения сверхпроводимости, критических магнитных полей, энергетической щели и значений параметров разрушения пар, но-видимому, подтверждает гипотезу о том, что собственная частота формвара играет роль частоты Дебая в установлении сверхпроводимости этих систем.

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Authors and Affiliations

  1. Istituto di Struttura della Materia dell'Università, Catania, Italia

    N. A. Mancini, G. Giaquinta, G. Burrafato, C. Di Mauro, A. Pennisi, F. Simone & S. O. Troia

  2. Unità di Catania, Gruppo Nazionale di Struttura della Materia del C.N.R., Catania, Italia

    N. A. Mancini, G. Giaquinta, G. Burrafato, C. Di Mauro, A. Pennisi, F. Simone & S. O. Troia

  3. Centro Siciliano di Fisica Nucleare e Struttura della Materia, Catania, Italia

    N. A. Mancini, G. Giaquinta, G. Burrafato, C. Di Mauro, A. Pennisi, F. Simone & S. O. Troia

  4. Centro Universitario di Microscopia Elettronica, Catania, Italia

    N. A. Mancini

  5. Facoltà di Ingegneria dell'Università, Catania, Italia

    G. Giaquinta

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  1. N. A. Mancini
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  7. S. O. Troia
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Mancini, N.A., Giaquinta, G., Burrafato, G. et al. Probable observation of «excitonic» superconductivity in formvar-aluminum sandwiches. Nuov Cim B 53, 435–445 (1979). https://doi.org/10.1007/BF02739906

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