Interplay of Fe and Nd magnetism in NdFeAsO single crystals

TitleInterplay of Fe and Nd magnetism in NdFeAsO single crystals
Publication TypeJournal Article
Year of Publication2010
AuthorsTian W, Ratcliff W, Kim MG, Yan JQ, Kienzle PA, Huang Q, Jensen B, Dennis KW, McCallum RW, Lograsso TA, McQueeney RJ, Goldman AI, Lynn JW, Kreyssig A
Journal TitlePhysical Review B
Date Published8/25
ISBN Number1098-0121
Accession NumberISI:000281225700002
Keywordslayered quaternary compound, phase-diagram, superconductivity, TRANSITIONS

The structural and magnetic phase transitions have been studied on NdFeAsO single crystals by neutron and x-ray diffraction complemented by resistivity and specific-heat measurements. Two low-temperature phase transitions have been observed in addition to the tetragonal-to-orthorhombic transition at T-S similar to 142 K and the onset of antiferromagnetic (AFM) Fe order below T-N similar to 137 K. The Fe moments order AFM in the well-known stripelike structure in the (ab) plane but change from AFM to ferromagnetic (FM) arrangement along the c direction below T* similar to 15 K accompanied by the onset of Nd AFM order below T-Nd similar to 6 K with this same AFM configuration. The iron magnetic order-order transition in NdFeAsO accentuates the Nd-Fe interaction and the delicate balance of c-axis exchange couplings that results in AFM in LaFeAsO and FM in CeFeAsO and PrFeAsO.

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