000085430 001__ 85430
000085430 005__ 20201122125253.0
000085430 0247_ $$2doi$$a10.1103/PhysRevB.100.104420
000085430 0248_ $$2sideral$$a114151
000085430 037__ $$aART-2019-114151
000085430 041__ $$aeng
000085430 100__ $$0(orcid)0000-0002-9029-1977$$aSubias, G.$$uUniversidad de Zaragoza
000085430 245__ $$aAtomic-scale mechanisms for magnetostriction in CoFe2O4 and La0.5Sr0.5CoO3 oxides determined by differential x-ray absorption spectroscopy
000085430 260__ $$c2019
000085430 5060_ $$aAccess copy available to the general public$$fUnrestricted
000085430 5203_ $$aThe atomic environments involved in the magnetostriction effect in CoFe2O4 and La0.5Sr0.5CoO3 poly-crystalline samples have been identified by differential extended x-ray absorption fine structure (DiffEXAFS) spectroscopy. We demonstrate that cobalt atoms at octahedral sites are responsible for their magnetostriction. The analysis of DiffEXAFS data indicates that the local-site magnetostrictive strains of Co atoms are reversed in these two oxides, in agreement with the macroscopic magnetostriction. For the CoFe2O4 spinel, a large negative strain along the (100) direction has been determined for the CoO6 octahedron causing a tetragonal contraction in contrast with the La0.5Sr0.5CoO3 perovskite, where a positive moderate strain along the (100) direction was found resulting in a tetragonal expansion. The different local-site magnetostriction is understood in terms of the different valence and spin state of the Co atoms for the two oxides. The macroscopic magnetostriction would be explained then by the relative change in volume, either contraction in CoFe2O4 or expansion in La0.5Sr0.5CoO3, when the tetragonal axis of the Co site is reoriented under an externally applied magnetic field.
000085430 536__ $$9info:eu-repo/grantAgreement/ES/MICINN-AEI-FEDER/RTI2018-098537-C22$$9info:eu-repo/grantAgreement/ES/DGA/E12-R17
000085430 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000085430 592__ $$a1.811$$b2019
000085430 593__ $$aElectronic, Optical and Magnetic Materials$$c2019$$dQ1
000085430 593__ $$aCondensed Matter Physics$$c2019$$dQ1
000085430 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000085430 700__ $$0(orcid)0000-0002-8021-8709$$aCuartero, V.
000085430 700__ $$aGarcia, J.
000085430 700__ $$0(orcid)0000-0002-9706-3272$$aBlasco, J.$$uUniversidad de Zaragoza
000085430 700__ $$aPascarelli, S.
000085430 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000085430 773__ $$g100, 10 (2019), 104420 [10 pp]$$pPhys. Rev. B$$tPHYSICAL REVIEW B$$x2469-9950
000085430 8564_ $$s593203$$uhttps://zaguan.unizar.es/record/85430/files/texto_completo.pdf$$yVersión publicada
000085430 8564_ $$s17996$$uhttps://zaguan.unizar.es/record/85430/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000085430 909CO $$ooai:zaguan.unizar.es:85430$$particulos$$pdriver
000085430 951__ $$a2020-11-22-12:44:11
000085430 980__ $$aARTICLE