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Structure determination of monolayer-by-monolayer grown La1-x Srx MnO3 thin films and the onset of magnetoresistance

Publication ,  Journal Article
Herger, R; Willmott, PR; Schlepütz, CM; Björck, M; Pauli, SA; Martoccia, D; Patterson, BD; Kumah, D; Clarke, R; Yacoby, Y; Döbeli, M
Published in: Physical Review B - Condensed Matter and Materials Physics
February 1, 2008

Surface x-ray diffraction was used to determine the atomic structures of La1-x Srx MnO3 thin films, grown monolayer by monolayer on SrTiO3 by pulsed laser deposition. Structures for one-, two-, three-, four-, six-, and nine-monolayer-thick films were solved using the Coherent Bragg rod analysis phase-retrieval method and subsequent structural refinement. Four important results were found. First, the out-of-plane lattice constant is elongated across the substrate-film interface. Second, the transition from substrate to film is not abrupt, but proceeds gradually over approximately three unit cells. Third, Sr segregates towards the topmost monolayer of the film: we determined a Sr-segregation enthalpy of -15 kJ mol from the occupation parameters. Finally, the electronic bandwidth W was used to explain the onset of magnetoresistance for films of nine or more monolayers thickness. Resistivity measurements of the nine monolayer-thick film confirm magnetoresistance and the presence of a dead layer with mostly insulating properties. © 2008 The American Physical Society.

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Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

February 1, 2008

Volume

77

Issue

8

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

Citation

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Herger, R., Willmott, P. R., Schlepütz, C. M., Björck, M., Pauli, S. A., Martoccia, D., … Döbeli, M. (2008). Structure determination of monolayer-by-monolayer grown La1-x Srx MnO3 thin films and the onset of magnetoresistance. Physical Review B - Condensed Matter and Materials Physics, 77(8). https://doi.org/10.1103/PhysRevB.77.085401
Herger, R., P. R. Willmott, C. M. Schlepütz, M. Björck, S. A. Pauli, D. Martoccia, B. D. Patterson, et al. “Structure determination of monolayer-by-monolayer grown La1-x Srx MnO3 thin films and the onset of magnetoresistance.” Physical Review B - Condensed Matter and Materials Physics 77, no. 8 (February 1, 2008). https://doi.org/10.1103/PhysRevB.77.085401.
Herger R, Willmott PR, Schlepütz CM, Björck M, Pauli SA, Martoccia D, et al. Structure determination of monolayer-by-monolayer grown La1-x Srx MnO3 thin films and the onset of magnetoresistance. Physical Review B - Condensed Matter and Materials Physics. 2008 Feb 1;77(8).
Herger, R., et al. “Structure determination of monolayer-by-monolayer grown La1-x Srx MnO3 thin films and the onset of magnetoresistance.” Physical Review B - Condensed Matter and Materials Physics, vol. 77, no. 8, Feb. 2008. Scopus, doi:10.1103/PhysRevB.77.085401.
Herger R, Willmott PR, Schlepütz CM, Björck M, Pauli SA, Martoccia D, Patterson BD, Kumah D, Clarke R, Yacoby Y, Döbeli M. Structure determination of monolayer-by-monolayer grown La1-x Srx MnO3 thin films and the onset of magnetoresistance. Physical Review B - Condensed Matter and Materials Physics. 2008 Feb 1;77(8).

Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

February 1, 2008

Volume

77

Issue

8

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences