### Сверхпроводимость

Добавлено:

**Пт авг 19, 2005 12:53**вроде очень интересно

Authors: J. D. Koralek (1 and 2), J.F. Douglas (1), N.C. Plumb (1), Z. Sun (1 and 3), A. Fedorov (3), M. Murnane (1 and 2), H. Kapteyn (1 and 2), S. Cundiff (2), Y. Aiura (4), K. Oka (4), H. Eisaki (4), D.S. Dessau (1 and 2) ((1) Department of Physics, University of Colorado, Boulder, CO, USA, (2) JILA, University of Colorado and NIST, Boulder, CO, USA, (3) Advanced Light Source, LBNL, Berkeley, CA, USA, (4) AIST Tsukuba Central 2, Tsukuba, Ibaraki, Japan)

Comments: 15 pages, 3 figures

Subj-class: Superconductivity; Strongly Correlated Electrons

A new low photon energy regime of angle resolved photoemission spectroscopy is accessed with lasers and used to study the superconductor Bi2Sr2CaCu2O8+delta. The low energy increases bulk sensitivity, reduces background, and improves resolution. With this we observe spectral peaks which are sharp on the scale of their binding energy - the clearest evidence yet for quasiparticles in the normal state. Crucial aspects of the data such as the dispersion, superconducting gaps, and the bosonic coupling kink and associated weight transfer are robust to a possible breakdown of the sudden approximation.

Full-text http://xxx.lanl.gov/pdf/cond-mat/0508404

**Laser ARPES, the sudden approximation, and quasiparticle-like peaks in Bi2Sr2CaCu2O8+delta**Authors: J. D. Koralek (1 and 2), J.F. Douglas (1), N.C. Plumb (1), Z. Sun (1 and 3), A. Fedorov (3), M. Murnane (1 and 2), H. Kapteyn (1 and 2), S. Cundiff (2), Y. Aiura (4), K. Oka (4), H. Eisaki (4), D.S. Dessau (1 and 2) ((1) Department of Physics, University of Colorado, Boulder, CO, USA, (2) JILA, University of Colorado and NIST, Boulder, CO, USA, (3) Advanced Light Source, LBNL, Berkeley, CA, USA, (4) AIST Tsukuba Central 2, Tsukuba, Ibaraki, Japan)

Comments: 15 pages, 3 figures

Subj-class: Superconductivity; Strongly Correlated Electrons

A new low photon energy regime of angle resolved photoemission spectroscopy is accessed with lasers and used to study the superconductor Bi2Sr2CaCu2O8+delta. The low energy increases bulk sensitivity, reduces background, and improves resolution. With this we observe spectral peaks which are sharp on the scale of their binding energy - the clearest evidence yet for quasiparticles in the normal state. Crucial aspects of the data such as the dispersion, superconducting gaps, and the bosonic coupling kink and associated weight transfer are robust to a possible breakdown of the sudden approximation.

Full-text http://xxx.lanl.gov/pdf/cond-mat/0508404