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Peculiar magnetic states in the double perovskite Nd2NiMnO6
Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics. Helmholtz Zentrum Berlin Mat & Energie, Inst Methods & Instrumentat Synchrotron Radiat Re, Albert Einstein Str 15, D-12489 Berlin, Germany.
Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India.
Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India.
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2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 4, article id 045122Article in journal (Refereed) Published
Abstract [en]

We present magnetic measurements on Nd2NiMnO6 which exhibits a well-known insulating paramagnetic state to an insulating ferromagnetic state transition when cooled below 200 K. Beyond this basic fact, there is a great deal of diversity in the reported magnetic properties and interpretation of specific anomalies observed in the magnetic data of this compound below the Curie temperature. We address specifically two anomalies discussed in the past, namely, a spin-glass like behavior observed in some samples near 100 K and a downturn in the magnetization with a lowering of the temperature below approximately 50 K. We show for the first time that the application of an increasing magnetic field can systematically change the low-temperature behavior to make the down-turn in the magnetization into an upturn. With the help of first principle calculations and extensive simulations along with our experimental observations, we provide a microscopic understanding of all magnetic properties observed in this interesting system to point out that the glassiness around 100 K is absent in well-ordered samples and that the low-temperature magnetic anomaly below 50 K is a consequence of a ferromagnetic coupling of the Nd spin moments with the spin of the Ni-Mn ordered sublattice without giving rise to any ordering of the Nd sublattice that remains paramagnetic, contrary to earlier claims. We explain this counter-intuitive interpretation of a ferromagnetic coupling of Nd spins with Ni-Mn spin giving rise to a decrease in the total magnetic moment by noting the less than half-filled 4f occupation of Nd that ensures orbital and spin moments of Nd to be opposite to each other due to the spin-orbit coupling. Since the ground state total magnetic moment of Nd has a contribution from the orbital moment, that is larger than the spin moment, the total moment of Nd is indeed pointing in a direction opposite to the direction of spin moments of the Ni-Mn sublattice as a consequence of the ferromagnetic exchange coupling between Nd and Ni-Mn spins.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 4, article id 045122
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Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-391944DOI: 10.1103/PhysRevB.100.045122ISI: 000476687000002OAI: oai:DiVA.org:uu-391944DiVA, id: diva2:1346817
Funder
Swedish Research Council, P46561-1Swedish Research Council, 2016-04524Swedish Research Council, 2013-08316Swedish Foundation for Strategic Research Knut and Alice Wallenberg FoundationeSSENCE - An eScience CollaborationStandUpAvailable from: 2019-08-29 Created: 2019-08-29 Last updated: 2019-08-29Bibliographically approved

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Jana, SomnathKeshavarz, SamaraThonig, DannyKvashnin, YaroslavPereiro, ManuelMathieu, RolandNordblad, PerEriksson, OlleKaris, Olof

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Jana, SomnathKeshavarz, SamaraThonig, DannyKvashnin, YaroslavPereiro, ManuelMathieu, RolandNordblad, PerEriksson, OlleKaris, Olof
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Molecular and Condensed Matter PhysicsMaterials TheorySolid State Physics
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