Metastable states of superconducting indium films

Blot, J.; Pellan, Y.; Rosenblatt, J.

doi:10.1007/bf00116205

Cited by 10 publications

(6 citation statements)

References 38 publications

(22 reference statements)

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“…In the region of thickness and mean free path of our samples (lo~-d) Fuchs' expression is very well approximated by the linear equation pd = p~ + o~po~l~/ d (1) with a = 0.46. The subscript m refers to the bulk material having the same volume properties and texture as the film.…”

Section: Sample Characterization and Measurementsmentioning

confidence: 89%

Metastable states of superconducting indium films. II

Pellan

Blot

1980

J Low Temp Phys

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Supercooling fields of In films condensed at 295 and 77 K ha ve been studied. Each series of films defines a different bulk material, whose Ginzburg-Landau (GL) parameter can be obtained from the measured supercooling fields. These bulk metals satisfy the Gor' kov-Goodman relation between the GL parameter and resistivity. Furthermore, this relation is also satisfied by GL parameters of individual type Il films condensed at 77K, while other layers condensed at 295K show deviations ascribed to nonlocal effects. The importance of a careful study of transport properties of the films for a correct interpretation of experiments is stressed.

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Section: Sample Characterization and Measurementsmentioning

confidence: 89%

Metastable states of superconducting indium films. II

Pellan

Blot

1980

J Low Temp Phys

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“…Sous champ croissant, 1'echantillon non divise A transite brutalement au champ critique du film HCFII determine comme indique sur la figure 2a. Sa valeur depend de 1'epaisseur du film et de la temperature [2,4].…”

Section: Classificationunclassified

“…Etant donne la faible variation de resistance (AR(H) = 45 mQ) enregistree lors de la transition complete de 1'echantillon et compte tenu du rapport signal sur bruit de notre systeme de mesure ... , , _ _, Fig. 2. -Transition sous champ magnetique parallele d'echantillons d'epaisseur 1,4 um, a la temperature reduite t = 0,927. a) Mesure resistive du champ critique sur le film A, non divise; b) Mesure resistive des champs de transition sur 1'echantillon B (voir Fig. I) ; c) Mesure inductive des champs de surchauffe et de surrefroidissement sur un echantillon divise C.…”

Section: Classificationunclassified

Mesure résistive des champs de surchauffe et de surrefroidissement sur des films supraconducteurs divisés

1980

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2014 Nous présentons une nouvelle structure permettant l'observation des états métastables supraconducteurs dans des films minces d'indium. Le film est partiellement divisé en îlots (carrés de 100 x 100 03BCm2) reliés par des ponts d'or; il est continu par ailleurs. Cette structure permet la mesure résistive simultanée du champ critique du film et des champs de surchauffe et de surrefroidissement. Les résultats sont en bon accord avec ceux obtenus par des mesures de susceptibilité. Abstract. 2014A new structure for observing metastable superconducting states in In thin films is presented. Over a fraction of its length, the film is divided into small islands (squares of 100 x 100 03BCm2) connected by normal metal (Au) bridges. Purely resistive measurements allow simultaneous observations to be made of both the superheating and supercooling fields in the islands and the critical field in the continuous region. Results are in good agreement with those obtained from susceptibility measurements.

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“…Although this transition is driven by surface effects it solely reflects an intrinsic property of the superconductor, namely, κ, as discussed below. There has been an intense search for this genuine-intermediate transition both theoretically [14,15] and experimentally [16][17][18][19] in the seventies, but after this period it became an elusive topic. The existence of the transition was even questioned [20] and its study no longer pursued.…”

Section: Introductionmentioning

confidence: 99%

The intermediate type-I superconductors in the mesoscopic scale

Cadorim,

Sardella,

Romaguera

et al. 2020

Preprint

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M. Tinkham and P. G. de Gennes, described in their books [1,2] the existence of an intermediate type-I superconductor as a consequence of an external surface that affects the well known classification of superconductors into type-I and II. Here we consider the mesoscopic superconductor where the ratio volume to area is small and the effects of the external surface are enhanced. By means of the standard Ginzburg-Landau theory the Tinkham-de Gennes scenario is extended to the mesoscopic type-I superconductor. We find new features of the transition at the passage from the genuine to the intermediate type-I. The latter has two distinct transitions, namely, from a paramagnetic to diamagnetic response in descending field and a quasi type-II behavior as the critical coupling 1/ √ 2 is approached in ascending field. The intermediate type-I phase proposed here, and its corresponding transitions, reflect intrinsic features of the superconductor and not its geometrical properties.

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Metastable states of superconducting indium films

Cited by 10 publications

References 38 publications

Metastable states of superconducting indium films. II

Metastable states of superconducting indium films. II

Mesure résistive des champs de surchauffe et de surrefroidissement sur des films supraconducteurs divisés

The intermediate type-I superconductors in the mesoscopic scale

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