Valence and origin of metal-insulator transition in Mn doped SrRuO{sub 3} studied by electrical transport, X-ray photoelectron spectroscopy and LSDA+U calculation

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.01.005· OSTI ID:21494233

Pandey, Sudhir K ^[1]; Pathak, L C ^[2]

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1. UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001 (India)
2. Materials Science and Technology Division, National Metallurgical Laboratory, CSIR, Jamshedpur 831007 (India)

We have studied the valence and electronic properties of Mn doped SrRuO{sub 3} using electrical transport measurement, X-ray photoelectron spectroscopy (XPS) and local (spin) density approximation plus Coulomb interaction strength calculation (LSDA+U). The resistivity data revealed that the system undergoes transition from metal to insulator at the critical Mn doping level, x{approx}0.2, which is accompanied by the structural transition from orthorhombic to tetragonal crystal symmetry. Besides, the significant reduction of the spectral weight at the coherent zone (0.8 eV) of the valence band is observed for x>0.2. The core XPS spectra suggest that both the transition elements exist in the mixed ionic pair, Ru{sup +4}/Ru{sup +5{r_reversible}}Mn{sup +3}/Mn{sup +4}. The detail analysis of the results suggests that the Coulomb correlation effect in conjugation with localization of the charge carriers predominate over the mixed ionic pair effect and responsible for the metal-insulator transition in the series. -- Graphical Abstract: XPS data and electrical transport data show that doping of Mn in metallic SrRuO{sub 3} induces mixed ionic pair Ru(IV)/Ru(V){r_reversible}Mn(III)/Mn(IV) and the system undergoes a transition from metal to insulator at the critical Mn doping level, x{approx}0.2. The origin for the metal-insulator transition has been discussed. Display Omitted Research highlights: {yields} We have investigated the electronic properties of SrRu{sub 1-x}Mn{sub x}O{sub 3} spectroscopically, which shows metal-insulator transition at the critical Mn doping concentartion x{approx}0.2. {yields} We report the valence states of Ru and Mn in the series. {yields} We also report the responsible mechanism for the metal-insulator transition in the series.

• OSTI ID: 21494233
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 3; Other Information: DOI: 10.1016/j.jssc.2011.01.005; PII: S0022-4596(11)00006-5; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHARGE CARRIERS
CRYSTALS
DOPED MATERIALS
INTERACTIONS
MILLI EV RANGE
ORTHORHOMBIC LATTICES
RUTHENIUM COMPOUNDS
RUTHENIUM IONS
SPECTRA
STRONTIUM COMPOUNDS
X-RAY PHOTOELECTRON SPECTROSCOPY
ALKALINE EARTH METAL COMPOUNDS
CHARGED PARTICLES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELECTRON SPECTROSCOPY
ENERGY RANGE
IONS
MATERIALS
PHOTOELECTRON SPECTROSCOPY
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS