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Title: Superconductor to Mott insulator transition in YBa2Cu3O7/LaCaMnO3 heterostructures

The superconductor-to-insulator transition (SIT) induced by means such as external magnetic fields, disorder or spatial confinement is a vivid illustration of a quantum phase transition dramatically affecting the superconducting order parameter. In this paper, in pursuit of a new realization of the SIT by interfacial charge transfer, we developed extremely thin superlattices composed of high Tc superconductor YBa2Cu3O7 (YBCO) and colossal magnetoresistance ferromagnet La0.67Ca0.33MnO3 (LCMO). By using linearly polarized resonant X-ray absorption spectroscopy and magnetic circular dichroism, combined with hard X-ray photoelectron spectroscopy, we derived a complete picture of the interfacial carrier doping in cuprate and manganite atomic layers, leading to the transition from superconducting to an unusual Mott insulating state emerging with the increase of LCMO layer thickness. In addition, contrary to the common perception that only transition metal ions may respond to the charge transfer process, we found that charge is also actively compensated by rare-earth and alkaline-earth metal ions of the interface. Finally, such deterministic control of Tc by pure electronic doping without any hindering effects of chemical substitution is another promising route to disentangle the role of disorder on the pseudo-gap and charge density wave phases of underdoped cuprates.
 [1] ;  [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [5] ;  [5] ;  [1] ;  [1] ;  [6] ;  [7] ;  [2] ;  [8] ;  [9]
  1. Univ. of Arkansas, Fayetteville, AR (United States)
  2. Univ. of California, Davis, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Temple University, Philadelphia, PA (United States)
  4. Oerlikon Leybold Vacuum GmbH, Koln (Germany)
  5. National Institute for Materials Science, Hyogo (Japan)
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Northwestern Univ., Evanston, IL (United States)
  7. Univ. of Tennessee, Knoxville, TN (United States)
  8. Univ. of Arkansas, Fayetteville, AR (United States); Rutgers Univ., Piscataway, NJ (United States)
  9. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC02-06CH11357; AC02-05CH11231; SC0014697
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Nature Publishing Group
Research Org:
Argonne National Laboratory (ANL); University of California, Davis, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); U.S. Army Research Laboratory - U.S. Army Research Office (ARO); Gordon and Betty Moore Foundation
Country of Publication:
United States