Electronic phase diagram of high-temperature copper oxide superconductors
- 23 May 2011
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 108 (23), 9346-9349
- https://doi.org/10.1073/pnas.1101008108
Abstract
In order to understand the origin of high-temperature superconductivity in copper oxides, we must understand the normal state from which it emerges. Here, we examine the evolution of the normal state electronic excitations with temperature and carrier concentration in Bi2Sr2CaCu2O8+δ using angle-resolved photoemission. In contrast to conventional superconductors, where there is a single temperature scale Tc separating the normal from the superconducting state, the high-temperature superconductors exhibit two additional temperature scales. One is the pseudogap scale T∗, below which electronic excitations exhibit an energy gap. The second is the coherence scale Tcoh, below which sharp spectral features appear due to increased lifetime of the excitations. We find that T∗ and Tcoh are strongly doping dependent and cross each other near optimal doping. Thus the highest superconducting Tc emerges from an unusual normal state that is characterized by coherent excitations with an energy gap.Keywords
This publication has 26 references indexed in Scilit:
- Where is the quantum critical point in the cuprate superconductors?Physica Status Solidi (b), 2010
- Theory of the pseudogap state of the cupratesPhysical Review B, 2006
- Crossover from Coherent to Incoherent Electronic Excitations in the Normal State ofPhysical Review Letters, 2003
- Temperature Dependent Scattering Rates at the Fermi Surface of Optimally DopedPhysical Review Letters, 2000
- Destruction of the Fermi surface in underdoped high-Tc superconductorsNature, 1998
- Excitation Gap in the Normal State of Underdoped Bi 2 Sr 2 CaCu 2 O 8+ δScience, 1996
- Spectroscopic evidence for a pseudogap in the normal state of underdoped high-Tc superconductorsNature, 1996
- Phenomenology of the normal state of Cu-O high-temperature superconductorsPhysical Review Letters, 1989
- Mean Field Theory of RVB and SuperconductivityJournal of the Physics Society Japan, 1988
- The Resonating Valence Bond State in La 2 CuO 4 and SuperconductivityScience, 1987