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Lu DH, Feng DL, Armitage NP, et al. Superconducting gap and strong in-plane anisotropy in untwinned YBa2Cu3O(7-delta). Phys Rev Lett. 2001;86(19):4370-3doi: 10.1103/PhysRevLett.86.4370.
Lu, D. H., Feng, D. L., Armitage, N. P., Shen, K. M., Damascelli, A., Kim, C., Ronning, F., Shen, Z. X., Bonn, D. A., Liang, R., Hardy, W. N., Rykov, A. I., & Tajima, S. (2001). Superconducting gap and strong in-plane anisotropy in untwinned YBa2Cu3O(7-delta). Physical review letters, 86(19), 4370-3. https://doi.org/10.1103/PhysRevLett.86.4370
Lu, D H, et al. "Superconducting gap and strong in-plane anisotropy in untwinned YBa2Cu3O(7-delta)." Physical review letters vol. 86,19 (2001): 4370-3. doi: https://doi.org/10.1103/PhysRevLett.86.4370
Lu DH, Feng DL, Armitage NP, Shen KM, Damascelli A, Kim C, Ronning F, Shen ZX, Bonn DA, Liang R, Hardy WN, Rykov AI, Tajima S. Superconducting gap and strong in-plane anisotropy in untwinned YBa2Cu3O(7-delta). Phys Rev Lett. 2001 May 07;86(19):4370-3. doi: 10.1103/PhysRevLett.86.4370. PMID: 11328177.
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Phys Rev Lett. 2001 May 07;86(19):4370-3. doi: 10.1103/PhysRevLett.86.4370.

Superconducting gap and strong in-plane anisotropy in untwinned YBa2Cu3O(7-delta).

Physical review letters

D H Lu, D L Feng, N P Armitage, K M Shen, A Damascelli, C Kim, F Ronning, Z X Shen, D A Bonn, R Liang, W N Hardy, A I Rykov, S Tajima

Affiliations

  1. Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA.

PMID: 11328177 DOI: 10.1103/PhysRevLett.86.4370

Abstract

With significantly improved sample quality and instrumental resolution, we clearly identify in the ( pi,0) photoemission spectra from YBa(2)Cu(3)O(6.993), in the superconducting state, the long-sought "peak-dip-hump" structure. This advance allows us to investigate the large a-b anisotropy of the in-plane electronic structure including, in particular, a 50% difference in the magnitude of the superconducting gap that scales with the energy position of the hump feature. This anisotropy, likely induced by the presence of the CuO chains, raises serious questions about attempts to quantitatively explain the YBa(2)Cu(3)O(7-delta) data from various experiments using models based on a perfectly square lattice.

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