DETERMINATION OF THE GAP IN BI-SR-CA-CU-O (2 2/1/2-PHASE) SUPERCONDUCTING WHISKERS BY TUNNELING SPECTROSCOPY/

Authors
BORISOVA IA PONOMAREV YG RAKHIMOV KT SUDAKOVA MV TSOKUR EB SHCHERBAKOV NA YARYGIN AV KRAAK W KRAPF A OSKINA TE TRETYAKOV YD
Citation
Ia. Borisova et al., DETERMINATION OF THE GAP IN BI-SR-CA-CU-O (2 2/1/2-PHASE) SUPERCONDUCTING WHISKERS BY TUNNELING SPECTROSCOPY/, JETP letters, 59(5), 1994, pp. 357-362
Citations number
23
Categorie Soggetti
Physics
Journal title
JETP letters → ACNP
ISSN journal
00213640
Volume
59
Issue
5
Year of publication
1994
Pages
357 - 362
Database
ISI
SICI code
0021-3640(1994)59:5<357:DOTGIB>2.0.ZU;2-D
Abstract
The current-voltage characteristics of break junctions in Bi-Sr-Ca-Cu- O whiskers (the 2:2:1:2 phase), with a transition temperature 60 less- than-or-equal-to T(c) less-than-or-equal-to 81 K, have been studied ex perimentally. These I-V characteristics have a gap structure which is easily reproducible. From it one can determine the gap parameter DELTA fairly accurately. In the interval of transition temperatures T(c) st udied, the ratio 2DELTA(0)/kT(c) for the Bi-Sr-Ca-Cu-O (2:2:1:2) whisk ers is 7.1 +/- 0.2. The temperature dependence of the gap, DELTA(T), a grees satisfactorily with the formal BCS theory.