Physics – Condensed Matter – Superconductivity
Scientific paper
2010-12-15
Physical Review B 83 104502 (2011)
Physics
Condensed Matter
Superconductivity
accepted in Phys. Rev. B
Scientific paper
We have studied the momentum dependence of the energy gap of Bi2(Sr,R)2CuOy by angleresolved photoemission spectroscopy (ARPES), particularly focusing on the difference between R=La and Eu. By comparing the gap function and characteristic temperatures between the two sets of samples, we show that there exist three distinct energy scales, {\Delta}pg, {\Delta}sc0, and {\Delta}eff sc0, which correspond to T* (pseudogap temperature), Tonset (onset temperature of fluctuating superconductivity), and Tc (critical temperature of coherent superconductivity). The results not only support the existence of a pseudogap state below T* that competes with superconductivity but also the duality of competition and superconducting fluctuation at momenta around the antinode below Tonset.
Ikuta Hiroaki
Ishizaka Kazuya
Kawaguchi Toshihiro
Ohkawa Masashi
Okada Yasuhiko
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