期刊
SCIENCE
卷 331, 期 6024, 页码 1579-1583出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1198415
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资金
- SGF
- Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515, DE-AC02-05CH11231]
The nature of the pseudogap phase of cuprate high-temperature superconductors is a major unsolved problem in condensed matter physics. We studied the commencement of the pseudogap state at temperature T* using three different techniques (angle-resolved photoemission spectroscopy, polar Kerr effect, and time-resolved reflectivity) on the same optimally doped Bi2201 crystals. We observed the coincident, abrupt onset at T* of a particle-hole asymmetric antinodal gap in the electronic spectrum, a Kerr rotation in the reflected light polarization, and a change in the ultrafast relaxational dynamics, consistent with a phase transition. Upon further cooling, spectroscopic signatures of superconductivity begin to grow close to the superconducting transition temperature (T-c), entangled in an energy-momentum-dependent manner with the preexisting pseudogap features, ushering in a ground state with coexisting orders.
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