Published July 2014 | Version v1
Journal article Metadata-only

Orbital correlations and dimensional crossover in epitaxial Pr0.5Ca0.5MnO3/La0.5Sr0.5MnO3 superlattices

Creators

  • 1. Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656 (Japan)
  • 2. Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801 (Japan)
  • 3. Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI (Switzerland)
  • 4. Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198 (Japan)
  • 5. RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198 (Japan)

Description

We studied the charge-orbital ordering in the superlattice of charge-ordered insulating Pr0.5Ca0.5MnO3 and ferromagnetic metallic La0.5Sr0.5MnO3 by resonant soft x-ray diffraction (RSXD) and hard x-ray photoemission spectroscopy (HXPES). A temperature-dependent incommensurability is found in the orbital ordering by RSXD. In addition, a large hysteresis is observed that is caused by phase competition between the insulating charge ordered and metallic ferromagnetic states. No magnetic phase transitions are observed in contrast to pure Pr0.5Ca0.5MnO3 thin films, confirming the unique character of the superlattice. Mn 2p HXPES spectra revealed a hysteresis in the metalicity, supporting the picture of phase competition. The deviation from the commensurate orbital order can be directly related to the decrease of ordered-layer thickness that leads to dimensional crossover from three-dimensional to two-dimensional orbital ordering. (paper)

Availability note (English)

Available from http://dx.doi.org/10.1088/1367-2630/16/7/073044

Additional details

Identifiers

DOI
10.1088/1367-2630/16/7/073044;

Publishing Information

Journal Title
New Journal of Physics
Journal Volume
16
Journal Issue
7
Journal Page Range
[10 p.]
ISSN
1367-2630

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
46064068
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
CALCIUM COMPOUNDS; EPITAXY; HARD X RADIATION; HYSTERESIS; LANTHANUM COMPOUNDS; LAYERS; MANGANESE OXIDES; PHASE TRANSFORMATIONS; PHOTOEMISSION; PRASEODYMIUM COMPOUNDS; SOFT X RADIATION; SPECTRA; SPECTROSCOPY; STRONTIUM COMPOUNDS; SUPERLATTICES; TEMPERATURE DEPENDENCE; THIN FILMS; THREE-DIMENSIONAL CALCULATIONS; TWO-DIMENSIONAL CALCULATIONS; X-RAY DIFFRACTION
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; CRYSTAL GROWTH METHODS; DIFFRACTION; ELECTROMAGNETIC RADIATION; EMISSION; FILMS; IONIZING RADIATIONS; MANGANESE COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; RARE EARTH COMPOUNDS; SCATTERING; SECONDARY EMISSION; TRANSITION ELEMENT COMPOUNDS; X RADIATION