Interplay between Fe and Nd magnetism in NdFeAsO single crystals
| Autor: | Tian, W., Ratcliff II, W., Kim, M. G., Yan, J. -Q., Kienzle, P. A., Huang, Q., Jensen, B., Dennis, K. W., McCallum, R. W., Lograsso, T. A., McQueeney, R. J., Goldman, A. I., Lynn, J. W., Kreyssig, A. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 82, 060514(R) (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.82.060514 |
| Popis: | 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. Comment: revised; 4 pages, 3 figures; accepted for publication in Phys. Rev. B |
| Databáze: | arXiv |
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