論文

査読有り
2018年

In situ STM observation of nonmagnetic impurity effect in MBE-grown CeCoIn5 films

Journal of the Physical Society of Japan
  • Masahiro Haze
  • ,
  • Yohei Torii
  • ,
  • Robert Peters
  • ,
  • Shigeru Kasahara
  • ,
  • Yuichi Kasahara
  • ,
  • Takasada Shibauchi
  • ,
  • Takahito Terashima
  • ,
  • Yuji Matsuda

87
3
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.7566/JPSJ.87.034702
出版者・発行元
Physical Society of Japan

Local electronic effects in the vicinity of an impurity provide pivotal insight into the origin of unconventional superconductivity, especially when the materials are located on the edge of magnetic instability. In high-temperature cuprate superconductors, a strong suppression of superconductivity and appearance of low-energy bound states are clearly observed near nonmagnetic impurities. However, whether these features are common to other strongly correlated superconductors has not been established experimentally. Here, we report the in situ scanning tunneling microscopy observation of electronic structure around a nonmagnetic Zn impurity in heavy-fermion CeCo(In1-xZnx)5 films, which are epitaxially grown by the state-of-the-art molecular beam epitaxy technique. The films have very wide atomically flat terraces and Zn atoms residing on two different In sites are clearly resolved. Remarkably, no discernible change is observed for the superconducting gap at and around the Zn atoms. Moreover, the local density of states around Zn atoms shows little change inside the c-f hybridization gap, which is consistent with calculations for a periodic Anderson model without local magnetic order. These results indicate that no nonsuperconducting region is induced around a Zn impurity and do not support the scenario of antiferromagnetic droplet formation suggested by indirect measurements in Cd-doped CeCoIn5. These results also highlight a significant difference of the impurity effect between cuprates and CeCoIn5, in both of which d-wave superconductivity arises from the non-Fermi liquid normal state near antiferromagnetic instabilities.

Web of Science ® 被引用回数 : 6

リンク情報
DOI
https://doi.org/10.7566/JPSJ.87.034702
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000425147300010&DestApp=WOS_CPL
ID情報
  • DOI : 10.7566/JPSJ.87.034702
  • ISSN : 1347-4073
  • ISSN : 0031-9015
  • SCOPUS ID : 85041687111
  • Web of Science ID : WOS:000425147300010

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