000079005 001__ 79005
000079005 005__ 20230330095433.0
000079005 0247_ $$2doi$$a10.1063/1.5087559
000079005 0248_ $$2sideral$$a111479
000079005 037__ $$aART-2019-111479
000079005 041__ $$aeng
000079005 100__ $$aFerreiro-Vila, E.
000079005 245__ $$aApparent auxetic to non-auxetic crossover driven by Co 2+ redistribution in CoFe 2 O 4 thin films
000079005 260__ $$c2019
000079005 5060_ $$aAccess copy available to the general public$$fUnrestricted
000079005 5203_ $$aOxide spinels of general formula AB2O4 (A = Mg2+, Fe2+; B = Al3+, Cr3+, etc.) constitute one of the most abundant crystalline structures in mineralogy. In this structure, cations distribute among octahedral and tetrahedral sites, according to their size and the crystal-field stabilization energy. The cationic arrangement determines the mechanical, magnetic, and transport properties of the spinel and can be influenced by external parameters like temperature, pressure, or epitaxial stress in the case of thin films. Here, we report a progressive change in the sign of the Poisson ratio, ¿, in thin films of CoFe2O4, defining a smooth crossover from auxetic (¿ < 0) to non-auxetic (¿ > 0) behavior in response to epitaxial stress and temperature. Microstructural and magnetization studies, as well as ab initio calculations, demonstrate that such unusual elastic response is actually due to a progressive redistribution of Co2+ among the octahedral and tetrahedral sites of the spinel structure. The results presented in this work clarify a long standing controversy about the magnetic and elastic properties of Co-ferrites and are of general applicability for understanding the stress-relaxation mechanism in complex crystalline structures.
000079005 536__ $$9info:eu-repo/grantAgreement/EC/H2020/734187/EU/Spin conversion, logic storage in oxide-based electronics/SPICOLOST$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 734187-SPICOLOST$$9info:eu-repo/grantAgreement/ES/MINECO/MAT2016-80762-R$$9info:eu-repo/grantAgreement/ES/MINECO/MAT2017-82970-C2-R
000079005 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000079005 590__ $$a3.819$$b2019
000079005 591__ $$aPHYSICS, APPLIED$$b33 / 154 = 0.214$$c2019$$dQ1$$eT1
000079005 591__ $$aNANOSCIENCE & NANOTECHNOLOGY$$b46 / 103 = 0.447$$c2019$$dQ2$$eT2
000079005 591__ $$aMATERIALS SCIENCE, MULTIDISCIPLINARY$$b98 / 314 = 0.312$$c2019$$dQ2$$eT1
000079005 592__ $$a1.57$$b2019
000079005 593__ $$aMaterials Science (miscellaneous)$$c2019$$dQ1
000079005 593__ $$aEngineering (miscellaneous)$$c2019$$dQ1
000079005 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000079005 700__ $$aIglesias, L.
000079005 700__ $$0(orcid)0000-0003-0271-8713$$aLucas Del Pozo, I.$$uUniversidad de Zaragoza
000079005 700__ $$aVarela-Dominguez, N.
000079005 700__ $$aBui, C.T.
000079005 700__ $$aRivas-Murias, B.
000079005 700__ $$aVila-Fungueiriño, J.M.
000079005 700__ $$0(orcid)0000-0003-0400-8600$$aJimenez-Cavero, P.$$uUniversidad de Zaragoza
000079005 700__ $$0(orcid)0000-0002-6761-6171$$aMagen, C.$$uUniversidad de Zaragoza
000079005 700__ $$0(orcid)0000-0003-3724-508X$$aMorellon, L.$$uUniversidad de Zaragoza
000079005 700__ $$aPardo, V.
000079005 700__ $$aRivadulla, F.
000079005 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000079005 773__ $$g7, 3 (2019), 031109 [6 pp]$$pAPL mater.$$tAPL Materials$$x2166-532X
000079005 8564_ $$s934657$$uhttps://zaguan.unizar.es/record/79005/files/texto_completo.pdf$$yVersión publicada
000079005 8564_ $$s103237$$uhttps://zaguan.unizar.es/record/79005/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000079005 909CO $$ooai:zaguan.unizar.es:79005$$particulos$$pdriver
000079005 951__ $$a2023-03-30-09:42:00
000079005 980__ $$aARTICLE