Journal
SCIENTIFIC REPORTS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-017-00247-z
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- National Science Council of Taiwan
- Ministry of Science and Technology of Taiwan (MoST) [NSC 102-2112-M-032-007-MY3, NSC 102-2632-M-032-001-MY3]
- Department of Science and Technology (DST), India [DST/INSPIRE/04/2015/002300]
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The local electronic and atomic structures of the high-quality single crystal of SrFeO3-delta (delta-0.19) were studied using temperature-dependent x-ray absorption and valence-band photoemission spectroscopy (VB-PES) to investigate the origin of anisotropic resistivity in the ab-plane and along the c-axis close to the region of thermal hysteresis (near temperature for susceptibility maximum, T-m similar to 78 K). All experiments herein were conducted during warming and cooling processes. The Fe L-3,L-2-edge X-ray linear dichroism results show that during cooling from room temperature to below the transition temperature, the unoccupied Fe 3d e(g) states remain in persistently out-of-plane 3d(3z) (2) (-r) (2) orbitals. In contrast, in the warming process below the transition temperature, they change from 3d(3z) (2) (-r) (2) to inplane 3d(x) (2) (-y) (2) orbitals. The nearest-neighbor (NN) Fe-O bond lengths also exhibit anisotropic behavior in the ab-plane and along the c-axis below T-m. The anisotropic NN Fe-O bond lengths and Debye-Waller factors stabilize the in-plane Fe 3d(x) (2) (-y) (2) and out-of-plane 3d(3z) (2) (-r) (2) orbitals during warming and cooling, respectively. Additionally, a VB-PES study further confirms that a relative band gap opens at low temperature in both the ab-plane and along the c-axis, providing the clear evidence of the chargedensity- wave nature of SrFeO3-delta (delta-0.19) single crystal.
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