What does instrinsic Josephson coupling say about the pairing symmetry in the cuprates?
- 21 Downloads
Measurements of the c-axis properties of the cuprate superconductors show anomalous behavior in both normal and superconducting states. In particular, there is strong evidence that pairs of CuO2 planes in neighboring unit cells act as Josephson junctions below the critical temperatureTc. We present a theory based on incoherent transport along the c-axis which naturally reproduces the anisotropic normal-state resistivity and the superconducting-state Josephson coupling. Applying this theory to YBa2Cu3O7-ς (YBCO), we make quantitative predictions for the strength and temperature dependence of the Josephson coupling as well as the variation ofTc with disorder. Beyond the expected low-temperature behavior, the Josephson critical current does not make a clean separation between s- and d-wave superconductors, but the disorder-inducedTc variation does. Further experimental and theoretical work along these lines may therefore help determine the order parameter symmetry in the cuprates.
Key wordsc-axis Josephson coupling order-parameter symmetry Tc suppression
Unable to display preview. Download preview PDF.
- 1.For a review, see S. L. Cooper and K. E. Gray, inPhysical Properties of High-Temperature Superconductors IV, D.M. Ginsberg, ed. (World Scientific, Singapore, 1994).Google Scholar
- 2.B. W. Veal, A. P. Paulikas and P. Kostic, unpublished.Google Scholar
- 3.R. Kleiner, F. Steinmeyer, G. Kunkel, and P. Müller,Phys. Rev. Lett. 68, 2394 (1992); R. Kleiner and P. Müller,Phys. Rev. B 49, 1327 (1994).Google Scholar
- 4.N. Kumar and A. M. Jayannavar,Phys. Rev. B 45, 5001 (1992).Google Scholar
- 5.A. J. Leggett,Braz. J. Phys. 22, 129 (1992).Google Scholar
- 6.M. J. Graf, D. Rainer, and J. A. Sauls,Phys. Rev. B 47, 12089 (1993) and unpublished.Google Scholar
- 7.A. G. Rojo and K. Levin,Phys. Rev. B 48, 16861 (1993).Google Scholar
- 8.R. J. Radtke, Ph.D. Thesis, The University of Chicago, Chicago, Illinois, 1994; R. J. Radtke, C. N. Lau, and K. Levin, unpublished.Google Scholar
- 9.V. Ambegaokar and A. Baratoff,Phys. Rev. Lett. 10, 486 (1963);ibid. 11, 104 (1963).Google Scholar
- 10.L. N. Bulaevskii,Sov. Phys.-JETP 37, 1133 (1973); J. R. Clem,Physica (Amsterdam) 162–164C, 1137 (1989).Google Scholar
- 11.T. Shibauchi, H. Kitano, K. Uchinokura, A. Maeda, T. Kimura, and K. Kishio,Phys. Rev. Lett. 72, 2263 (1994).Google Scholar
- 12.Jian Mao, D. J. Wu, J. L. Peng, R. L. Greene, and S. M. Anlage,Phys. Rev. B, in press.Google Scholar
- 13.P. W. Anderson,J. Phys. Chem. Solids 11, 26 (1959).Google Scholar
- 14.A. J. Millis, S. Sachdev, and C. M. Varma,Phys. Rev. B 37, 4975 (1988).Google Scholar
- 15.R. J. Radtke, K. Levin, H.-B. Schüttler, and M. R. Norman,Phys. Rev. B 48, 653 (1993).Google Scholar
- 16.A. G. Sun, L. M. Paulius, D. A. Gajewski, and M. B. Maple,Phys. Rev. B 50, 3266 (1994).Google Scholar
- 17.J. Giapintzakis, D. M. Ginsberg, M. A. Kirk, and S. Ockers, unpublished.Google Scholar