Orbital- and spin-order sensitive nonlocal screening in Mn 2p X-ray photoemission of La1−xSrxMnO3. (18th May 2016)

• Record Type: Journal Article
• Authors: Hariki, A.; Yamanaka, A.; Uozumi, T.
• Is Part Of: Europhysics letters. Volume 114:Number 2(2016:Apr.)
• Publication Date: 2016-05-18
• Subjects: 71.10.-w -- 79.60.-i -- 75.25.Dk; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/114/27003
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: The Mn 2 p X-ray photoemission spectra (XPS) of LaMnO3 (LMO) and hole-doped La0.7 Sr0.3 MnO3 (LSMO) are investigated using a dp model simulating Mn 3 d and O 2 p electrons under the perovskite-type crystal structure. The observed 2 p XPS features, especially the low-binding-energy structure (LBES) of the main line, are reproduced well using an impurity Anderson model optimized from the dp model within the dynamical mean-field approximation. The LBES in both compounds is due to the nonlocal screening (NLS) between the neighboring Mn ions in the final state, but the screening character is quite different: The NLS in LSMO directly reflects the character of the ferromagnetic metal, while that in undoped LMO the C-type orbital order between and orbitals in the ab -plane. We emphasize the directive nature of the NLS in the orbital order system, which can be a sensitive probe to the order pattern.