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

被引：3
|
作者：
Wadati, H. [1 ,2 ]
Okamoto, J. [3 ]
Garganourakis, M. [4 ]
Scagnoli, V. [4 ]
Staub, U. [4 ]
Sakai, E. [3 ]
Kumigashira, H. [3 ]
Sugiyama, T. [5 ]
Ikenaga, E. [5 ]
Nakamura, M. [6 ]
Kawasaki, M. [1 ,2 ,6 ]
Tokura, Y. [1 ,2 ,6 ]
机构：
[1] Univ Tokyo, Dept Appl Phys, Hongo, Tokyo 1138656, Japan
[2] Univ Tokyo, Quantum Phase Elect Ctr, Hongo, Tokyo 1138656, Japan
[3] High Energy Accelerator Res Org, Inst Mat Struct Sci, Condensed Matter Res Ctr & Photon Factory, Tsukuba, Ibaraki 3050801, Japan
[4] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland
[5] Japan Synchrotron Radiat Res Inst, SPring 8, Sayo, Hyogo 6795198, Japan
[6] RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan
来源：
NEW JOURNAL OF PHYSICS | 2014年 / 16卷
基金：
日本学术振兴会; 瑞士国家科学基金会;
关键词：
resonant soft x-ray diffraction; hard x-ray photoemission spectroscopy; Pr0.5Ca0.5MnO3; La0.5Sr0.5MnO3; superlattices; THIN-FILMS; MANGANITES; CHARGE; MAGNETORESISTANCE; LA0.5SR1.5MNO4; DIFFRACTION; MANGANATES; TRANSITION; SCATTERING; PHYSICS;
D O I：
10.1088/1367-2630/16/7/073044
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：10
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