Pair tunneling from {ital c}-axis YBa{sub 2} Cu{sub 3}O{sub 7{minus}{ital x}} to Pb: Evidence for {ital s}-wave component from microwave induced steps
- Department of Physics, University of California, Berkeley, CA 94720 (United States)
In heavily twinned crystals or films YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} (YBCO), {ital d}{sub {ital x}{sup 2}{minus}{ital y}{sup 2}} pairing symmetry is expected to cause the cancellation of first-order Josephson tunneling through a YBCO-Pb tunnel junction grown in an {ital a}-{ital b} face; any residual tunneling is thus second order. As a result, microwaves at frequency {ital f} are predicted to induce steps on the current-voltage characteristic at voltages that are multiples of 1/2({ital hf}/2{ital e}). Experimentally, steps are observed only at multiples of {ital hf}/2{ital e}, suggesting that {ital s}-wave pairing is present in YBCO; however, the simultaneous presence of {ital d}-wave pairing is by no means ruled out. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 284444
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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