Chemical pressure effects on crystal and magnetic structures of bilayer manganites PrA2Mn2O7 (A = Sr or Ca)

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dc.contributor.authorDeng, Gen_AU
dc.contributor.authorSheptyakov, Den_AU
dc.contributor.authorPomjakushin, Ven_AU
dc.contributor.authorMedarde, Men_AU
dc.contributor.authorPomjakushina, Een_AU
dc.contributor.authorConder, Ken_AU
dc.contributor.authorKenzelmann, Men_AU
dc.contributor.authorStuder, AJen_AU
dc.contributor.authorGardner, JSen_AU
dc.contributor.authorMcIntyre, GJen_AU
dc.date.accessioned2021-12-17T03:27:45Zen_AU
dc.date.available2021-12-17T03:27:45Zen_AU
dc.date.issued2016-06-03en_AU
dc.date.statistics2021-12-07en_AU
dc.description.abstractThe crystal and magnetic structures of the bilayer manganites PrSr2Mn2O7 (PSMO) and PrCa2Mn2O7 (PCMO) have been studied by neutron powder diffraction. It was found that PSMO crystallizes in space group I4/mmm, while PCMO adopts space group Cmc21 at room temperature. The difference in the structure arises from chemical pressure induced by the Ca substitution for Sr on the A sites, which causes different Jahn-Teller distortions. In PSMO, the MnO6 octahedra suffer a small elongated distortion, while those in PCMO adopt strong compressed distortion along the axial direction. In addition, the octahedra in PCMO show a+b0c0 rotation and a0b+c+ tilting in the Glazer notation in comparison to PSMO. As a result, these two compounds adopt very different magnetic structures: The magnetic structure of PSMO is an A-type magnetic structure (Im'm'm) with propagation vector k = (0, 0, 1) and magnetic moments in the ab plane. In contrast, a C-type antiferromagnetic magnetic structure (Cm'c2′1) with the multiple propagation vectors (k = (0, 12, 12) and (0, 12, 0)) and magnetic moments mainly along the b axis is found in PCMO. The critical exponent of the magnetic phase transition is around 0.345 for PSMO and 0.235 for PCMO, indicating 3D and 2D XY transitions, respectively. The strong Jahn-Teller distortion induced by the chemical pressure is believed to suppress the double exchange and favour super-exchange in PCMO, leading to the dramatic difference in the magnetic structure. © 2016 Author(s). Published by AIP Publishing.en_AU
dc.identifier.articlenumber214102en_AU
dc.identifier.citationDeng, G., Sheptyakov, D., Pomjakushin, V., Medarde, M., Pomjakushina, E., Conder, K., Kenzelmann, M., Studer, A. J., Gardner, J. S., & McIntyre, G. J. (2016). Chemical pressure effects on crystal and magnetic structures of bilayer manganites PrA2Mn2O7 (A = Sr or Ca), Journal of Applied Physics, 119, 214102. doi:10.1063/1.4953143en_AU
dc.identifier.issn1089-7550en_AU
dc.identifier.journaltitleJournal of Applied Physicsen_AU
dc.identifier.urihttps://doi.org/10.1063/1.4953143en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12545en_AU
dc.identifier.volume119en_AU
dc.language.isoenen_AU
dc.publisherAIP Publishingen_AU
dc.subjectCrystal structureen_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectMagnetic momentsen_AU
dc.subjectPhase transformationsen_AU
dc.subjectJahn-Teller effecten_AU
dc.titleChemical pressure effects on crystal and magnetic structures of bilayer manganites PrA2Mn2O7 (A = Sr or Ca)en_AU
dc.typeJournal Articleen_AU
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