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Superconducting gap of overdoped Tl2Ba2CuO6+d observed by Raman scattering

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arxiv 0712.3381 v1 pith:YUIIP3P7 submitted 2007-12-20 cond-mat.supr-con cond-mat.str-el

Superconducting gap of overdoped Tl2Ba2CuO6+d observed by Raman scattering

K. Nishikawa , T. Masui , S. Tajima , H. Eisaki , H. Kito , A. Iyo This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords observedoverdopedmixingramans-wavescatteringspectratl2ba2cuo6
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report Raman scattering spectra for single crystals of overdoped Tl2Ba2CuO6+d (Tl-2201) at low temperatures. It was observed that the pair-breaking peaks in A1g and B1g spectra radically shift to lower energy with carrier doping. We interpret it as s-wave component mixing into d-wave, although the crystal structure is tetragonal. Since similar phenomena were observed also in YBa2Cu3Oy and Bi2Sr2CaCu2Oz, we conclude that s-wave mixing is a common property for overdoped high-Tc superconductors.

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