Physics – Condensed Matter – Superconductivity
Scientific paper
2010-06-06
Phys. Rev. B 82, 060514(R) (2010)
Physics
Condensed Matter
Superconductivity
revised; 4 pages, 3 figures; accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.82.060514
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 = 142 K and the onset of antiferromagnetic (AFM) Fe order below T_N = 137 K. The Fe moments order AFM in the well-known stripe-like 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 T_Nd = 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.
Dennis K. W.
Goldman Alan I.
Huang Qingzhen
II William Ratcliff
Jensen Bjørn
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