skip to main content

DOE PAGESDOE PAGES

Title: Selective interlayer ferromagnetic coupling between the Cu spins in YBa 2Cu 3O 7–x grown on top of La 0.7Ca 0.3MnO 3

Studies to date on ferromagnet/d-wave superconductor heterostructures focus mainly on the effects at or near the interfaces while the response of bulk properties to heterostructuring is overlooked. Here we use resonant soft x-ray scattering spectroscopy to reveal a novel c-axis ferromagnetic coupling between the in-plane Cu spins in YBa 2Cu 3O 7–x (YBCO) superconductor when it is grown on top of ferromagnetic La 0.7Ca 0.3MnO 3 (LCMO) manganite layer. This coupling, present in both normal and superconducting states of YBCO, is sensitive to the interfacial termination such that it is only observed in bilayers with MnO 2 but not with La 0.7Ca 0.3O interfacial termination. Thus, such contrasting behaviors, we propose, are due to distinct energetic of CuO chain and CuO 2 plane at the La 0.7Ca 0.3O and MnO 2 terminated interfaces respectively, therefore influencing the transfer of spin-polarized electrons from manganite to cuprate differently. Our findings suggest that the superconducting/ferromagnetic bilayers with proper interfacial engineering can be good candidates for searching the theorized Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state in cuprates and studying the competing quantum orders in highly correlated electron systems.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1] ;  [5] ;  [1] ;  [4] ;  [1] ;  [1] ;  [6]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); New York Univ., New York, NY (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
  4. National Chiao Tung Univ., Hsinchu (Taiwan)
  5. National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); National Chiao Tung Univ., Hsinchu (Taiwan)
Publication Date:
Grant/Contract Number:
AC03-76SF00515; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ferromagnetism; magnetic properties and materials; superconducting properties and materials; surfaces, interfaces and thin films
OSTI Identifier:
1228034
Alternate Identifier(s):
OSTI ID: 1378650