Journal or Book Title
Physical Review B
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 TS∼142 K and the onset of antiferromagnetic (AFM) Fe order belowTN∼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∗∼15 K accompanied by the onset of Nd AFM order below TNd∼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.
American Physical Society
Tian, W.; Ratcliff, W. II; Kim, M. G.; Yan, J.-Q.; Klenzle, P. A.; Huang, Q.; Jensen, Brandt A.; Dennis, Kevin W.; McCallum, R. William; Lograsso, Thomas A.; McQueeney, Robert J.; Goldman, Alan I.; Lynn, J. W.; and Kreyssig, Andreas, "Interplay of Fe and Nd magnetism in NdFeAsO single crystals" (2010). Ames Laboratory Publications. 46.