Anomalous temperature dependence of the electromagnetic penetration depth of Y1Ba2Cu3O7−δ crystals

✍ Scribed by V.A. Gasparov; M.R. Mkrtchyan; M.A. Obolensky; A.V. Bondarenko

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 607 KB
• Volume: 231
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)90162-7

✦ Synopsis

We report radio-frequency surface-impedance measurements on high-quality single crystals of Y,Ba2Cu3Ov_6, which exhibit a very sharp superconducting transition (AT< 0.3 K). We found a frequency dependence neither of the skin depth in the normal state dn, nor of~.(T). The temperature dependence of the electromagnetic penetration depth 2(T) determined from these data is in agreement with the two-~p BCS dependence with 2A(O)/kaT~-2.2 and 7.9 for low-and high-temperature limits, respectively, in contrast to the square and linear laws in T observed so far and expected from d wave pairing.