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Temperature Dependent Angle Resolved Photoemission Spectroscopy Study of Pseudo-gaps in $Sm_{1.82}Ce_{0.18}CuO_4$  

Song, D.J. (Institute of Physics and Applied Physics, Yonsei U)
Choi, H.Y. (Institute of Physics and Applied Physics, Yonsei U)
Kim, Chul (Institute of Physics and Applied Physics, Yonsei U)
Park, S.R. (Institute of Physics and Applied Physics, Yonsei U)
Kim, C. (Institute of Physics and Applied Physics, Yonsei U)
Eisaki, H. (National Institute of Advanced Industrial Science and Technology)
Publication Information
Progress in Superconductivity / v.11, no.2, 2010 , pp. 83-86 More about this Journal
Abstract
There are theoretical and experimental evidences for the pseudo-gap in electron doped cuprates being due to interaction between electrons and anti-ferromagnetism(AFM). A remaining issue is on how AFM correlates with pseudo-gap, and eventually with superconductivity. To elucidate the issue, we have performed temperature dependent angle-resolved photoemission studies of an e-doped cuprate superconductor $Sm_{2-x}Ce_xCuO_4$(SCCO) x=0.18 at 20K and 150K. In the case of $Nd_{2-x}Ce_xCuO_4$, the most well known e-doped cuprate, pseudo-gap disappears at around 100 K for x=0.17. Our experimental result reveals that the pseudo-gap of SCCO exists even at 150K for x=0.18. This result implies that the AFM of SCCO survives even in x=0.18, which agrees with previously reported phase diagram of SCCO. Yet, the superconductivity disappears around x=0.18 for both NCCO and SCCO in spite of the difference in the magnetic order. This result sheds a light on the disappearance of superconductivity on the over-doped side.
Keywords
Cuprate; ARPES; Pseudo-gap; Superconductivity; Electronic structure;
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