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Phys. Rev. Lett. 104, 017204 (2010) [4 pages]

Lattice Distortion and Magnetic Quantum Phase Transition in CeFeAs1-xPxO

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Clarina de la Cruz1,2, W. Z. Hu3, Shiliang Li1,3, Q. Huang4, J. W. Lynn4, M. A. Green4, G. F. Chen3,5, N. L. Wang3, H. A. Mook2, Qimiao Si6, and Pengcheng Dai1,2,3,*
1Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA
2Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6012, USA
5Department of Physics, Renmin University of China, Beijing 100872, China
6Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA

Received 19 October 2009; published 8 January 2010

We use neutron diffraction to study the structural and magnetic phase diagram of CeFeAs1-xPxO. We find that replacing the larger arsenic with smaller phosphorus in CeFeAs1-xPxO simultaneously suppresses the AFM order and orthorhombic distortion near x=0.4, thus suggesting the presence of a magnetic quantum critical point. Our detailed structural analysis reveals that the pnictogen height is an important controlling parameter for their electronic and magnetic properties, and may play an important role in electron pairing and superconductivity of these materials.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.017204
DOI:
10.1103/PhysRevLett.104.017204
PACS:
75.30.Fv, 75.25.-j, 75.50.Ee

*daip@ornl.gov

 
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