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- W1668987579 abstract "In this review we describe the current-voltage spectroscopy of superconductors which, in contrast to the tunneling spectroscopy, considers contacts with direct conductivity, without any barrier. These contacts are usually called point contacts as their lateral dimension should be smaller than some microscopic lengths such as the coherence length in superconductors and the inelastic mean free path of conduction electrons in normal metals. Some of 3-dimensional metallic constrictions are schematically depicted in Fig. 5.1. A shorted thin-film tunneling junction (a) was historically the first structure in which the point-contact spectroscopy was discovered [1]. A much more sophisticated thin-film structure is displayed in (b) where the tiny controlled orifice was made in the insulating diaphragm of Si3N4 by means of ion-beam nanolithography [2]. Point-contacts with bulk electrodes are shown in Fig. 5.1(c-e) for different geometries. The simplest are the pressure-type contacts in which two sharp edges (c) [3] or a needle and an anvil (d) [4] are forced to touch each other gently. Most point-contact spectroscopic studies were made just with these very simple experimental devices. The mechanically controlled break-junction (MCB) (Fig. 5.1e) gives an experimentalist new advantages [5]. A small rode of a metal 1 is glued by the Staycast varnish 3 to the bending beam 4. The latter can be bent by a piezo driver 5 so that the notch 2 at the centre of the sample becomes stretched and the cross-section area of the constriction is gradually decreased." @default.
- W1668987579 created "2016-06-24" @default.
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- W1668987579 date "2000-01-01" @default.
- W1668987579 modified "2023-09-23" @default.
- W1668987579 title "Point-Contact Spectroscopy of Superconductors" @default.
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- W1668987579 doi "https://doi.org/10.1007/978-94-011-4327-1_5" @default.
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