Quasi-particle interference and superconducting gap in a high-temperature superconductor Ca2-xNaxCuO2Cl2 - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: High-transition-temperature high-Tc superconductivity is ubiquitous in thecuprates containing CuO2 planes but each cuprate has its own character. Thestudy of the material dependence of the d-wave superconducting gap SG shouldprovide important insights into the mechanism of high-Tc. However, because ofthe -pseudogap- phenomenon, it is often unclear whether the energy gapsobserved by spectroscopic techniques really represent the SG. Here, we reportspectroscopic imaging scanning tunneling microscopy SI-STM studies ofnearly-optimally-doped Ca2-xNaxCuO2Cl2 Na-CCOC with Tc = 25 ~ 28 K. Theyenable us to observe the quasi-particle interference QPI effect in thismaterial, through which unambiguous new information on the SG is obtained. Theanalysis of QPI in Na-CCOC reveals that the SG dispersion near the gap node isalmost identical to that of Bi2Sr2CaCu2Oy Bi2212 at the same doping level,while Tc of Bi2212 is 3 times higher than that of Na-CCOC. We also find that SGin Na-CCOC is confined in narrower energy and momentum ranges than Bi2212. Thisexplains at least in part the remarkable material dependence of Tc



Autor: T. Hanaguri, Y. Kohsaka, J. C. Davis, C. Lupien, I. Yamada, M. Azuma, M. Takano, K. Ohishi, M. Ono, H. Takagi

Fuente: https://arxiv.org/







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