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Phys. Rev. B 78, 132504 (2008) [4 pages]

Lattice and magnetic structures of PrFeAsO, PrFeAsO0.85F0.15, and PrFeAsO0.85

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Jun Zhao1, Q. Huang2, Clarina de la Cruz1,3, J. W. Lynn2, M. D. Lumsden3, Z. A. Ren4, Jie Yang4, Xiaolin Shen4, Xiaoli Dong4, Zhongxian Zhao4, and Pengcheng Dai1,3
1Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA
2NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6012, USA
3Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
4Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China

Received 29 July 2008; published 7 October 2008

We use powder neutron diffraction to study the spin and lattice structures of polycrystalline samples of nonsuperconducting PrFeAsO and superconducting PrFeAsO0.85F0.15 and PrFeAsO0.85. We find that PrFeAsO exhibits abrupt structural phase transitions at 153 K followed by static long-range antiferromagnetic order at 127 K. Both the structural distortion and magnetic order are similar to other rare-earth oxypnictides. Electron doping the system with either fluorine or oxygen deficiency suppresses the structural distortion and static long-range antiferromagnetic order, therefore placing these materials into the same class of FeAs-based superconductors.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.132504
DOI:
10.1103/PhysRevB.78.132504
PACS:
75.25.+z, 75.50.Ee, 25.40.Dn, 75.30.Fv
 
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