Phase competition in trisected superconducting dome
Open Access
- 10 October 2012
- 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. 109 (45), 18332-18337
- https://doi.org/10.1073/pnas.1209471109
Abstract
A detailed phenomenology of low energy excitations is a crucial starting point for microscopic understanding of complex materials, such as the cuprate high-temperature superconductors. Because of its unique momentum-space discrimination, angle-resolved photoemission spectroscopy (ARPES) is ideally suited for this task in the cuprates, where emergent phases, particularly superconductivity and the pseudogap, have anisotropic gap structure in momentum space. We present a comprehensive doping- and temperature-dependence ARPES study of spectral gaps in Bi2Sr2CaCu2O8+δ, covering much of the superconducting portion of the phase diagram. In the ground state, abrupt changes in near-nodal gap phenomenology give spectroscopic evidence for two potential quantum critical points, p = 0.19 for the pseudogap phase and p = 0.076 for another competing phase. Temperature dependence reveals that the pseudogap is not static below Tc and exists p > 0.19 at higher temperatures. Our data imply a revised phase diagram that reconciles conflicting reports about the endpoint of the pseudogap in the literature, incorporates phase competition between the superconducting gap and pseudogap, and highlights distinct physics at the edge of the superconducting dome.Keywords
This publication has 56 references indexed in Scilit:
- Long-Range Incommensurate Charge Fluctuations in (Y,Nd)Ba2Cu3O6+xScience, 2012
- The phase diagram for coexisting d-wave superconductivity and charge-density waves: cuprates and beyondJournal of Physics: Condensed Matter, 2011
- Electronic phase diagram of high-temperature copper oxide superconductorsProceedings of the National Academy of Sciences of the United States of America, 2011
- Metal-insulator quantum critical point beneath the high T c superconducting domeProceedings of the National Academy of Sciences of the United States of America, 2010
- Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4Nature Physics, 2008
- Coexistence of Competing Orders with Two Energy Gaps in Real and Momentum Space in the High Temperature SuperconductorPhysical Review Letters, 2008
- Imaging the two gaps of the high-temperature superconductor Bi2Sr2CuO6+xNature Physics, 2007
- Evidence for Two Energy Scales in the Superconducting State of Optimally DopedPhysical Review Letters, 2007
- Superfluid density in cuprate high-superconductors: A new paradigmPhysical Review B, 2003
- Excitation Gap in the Normal State of Underdoped Bi 2 Sr 2 CaCu 2 O 8+ δScience, 1996