000126382 001__ 126382
000126382 005__ 20240731103307.0
000126382 0247_ $$2doi$$a10.1103/PhysRevB.107.165133
000126382 0248_ $$2sideral$$a133879
000126382 037__ $$aART-2023-133879
000126382 041__ $$aeng
000126382 100__ $$0(orcid)0000-0002-9029-1977$$aSubías, G.
000126382 245__ $$aEffects of A -site ordering on the Mn local structure and polar phases of R Ba Mn 2 O 6 ( R = La , Nd, Sm, and Y)
000126382 260__ $$c2023
000126382 5060_ $$aAccess copy available to the general public$$fUnrestricted
000126382 5203_ $$aWe have investigated the temperature dependence of the Mn local structure in A-site ordered RBaMn2O6 (R = La, Nd, Sm, and Y) perovskites, in parallel with their disordered counterparts, R0.5Ba0.5MnO3, by means of x-ray emission (XES) and x-ray absorption spectroscopy (XAS) The end member LaBaMn2O6 shows a nearly regular MnO6 octahedron independent of temperature. With decreasing the R ionic radius in the ordered samples, the XAS results indicate that a local distortion develops in the MnO6 octahedron at the low-temperature charge-localized and polar phases. For NdBaMn2O6, this local distortion is tiny, indicating the absence of charge segregation at the Mn site. This is followed by a bigger local distortion anticipated for SmBaMn2O6 in its respective charge-localized and polar phase and finally, the biggest local distortion for the smallest A-site cation ordered compound, YBaMn2O6, for which it even persists above the polar charge-localization transition temperatures. The high-resolution XAS spectra confirm the presence of charge segregation between two nonequivalent Mn sites in the low-temperature polar phase of Sm and Y ordered samples. Thus, our XAS study suggests a displacive mechanism for the charge-localization and polar transitions in the Nd and Sm ordered samples while a combination of displacive and order-disorder contributions is revealed for YBaMn2O6. Besides, calorimetric measurements confirm the combination of the two mechanisms, order-disorder and displacive, for the ordered Sm and Y compounds. On the other hand, the A-site disordered R0.5Ba0.5MnO3 samples with R cations smaller than Nd present a significant static (temperature-independent) local disorder, which explains why
polar charge-localization transitions are not developed in these samples. Finally, we correlate our results about the Mn local structure and character of the transitions with the macroscopic magnetic and electric behavior of both A-site ordered and disordered compounds.
000126382 536__ $$9info:eu-repo/grantAgreement/ES/MCIU-FEDER/RTI2018-098537-B-C22$$9info:eu-repo/grantAgreement/ES/MICINN/PID2021-124734OB-C21
000126382 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000126382 590__ $$a3.2$$b2023
000126382 592__ $$a1.345$$b2023
000126382 591__ $$aMATERIALS SCIENCE, MULTIDISCIPLINARY$$b201 / 438 = 0.459$$c2023$$dQ2$$eT2
000126382 593__ $$aElectronic, Optical and Magnetic Materials$$c2023$$dQ1
000126382 591__ $$aPHYSICS, CONDENSED MATTER$$b31 / 79 = 0.392$$c2023$$dQ2$$eT2
000126382 593__ $$aCondensed Matter Physics$$c2023$$dQ1
000126382 591__ $$aPHYSICS, APPLIED$$b62 / 179 = 0.346$$c2023$$dQ2$$eT2
000126382 594__ $$a6.3$$b2023
000126382 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000126382 700__ $$0(orcid)0000-0002-2567-9529$$aBlasco, J.$$uUniversidad de Zaragoza
000126382 700__ $$0(orcid)0000-0002-8021-8709$$aCuartero, V.$$uUniversidad de Zaragoza
000126382 700__ $$0(orcid)0000-0001-8303-932X$$aLafuerza, S.
000126382 700__ $$aSimonelli, L.
000126382 700__ $$aGorni, G.
000126382 700__ $$0(orcid)0000-0002-9687-4903$$aCastro, M.$$uUniversidad de Zaragoza
000126382 700__ $$aGarcía, J.
000126382 7102_ $$15001$$2600$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Mecánica de Fluidos
000126382 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal.
000126382 773__ $$g107, 16 (2023), 165133 [13 pp.]$$pPhys. Rev. B$$tPhysical Review B$$x2469-9950
000126382 8564_ $$s1226059$$uhttps://zaguan.unizar.es/record/126382/files/texto_completo.pdf$$yVersión publicada
000126382 8564_ $$s3049126$$uhttps://zaguan.unizar.es/record/126382/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000126382 909CO $$ooai:zaguan.unizar.es:126382$$particulos$$pdriver
000126382 951__ $$a2024-07-31-09:38:20
000126382 980__ $$aARTICLE