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Lattice distortion and magnetic quantum phase transition in CeFeAs(1-x)P(x)O

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arxiv 0907.2853 v1 pith:RCPGMWTQ submitted 2009-07-16 cond-mat.supr-con

Lattice distortion and magnetic quantum phase transition in CeFeAs(1-x)P(x)O

Clarina de la Cruz , W. Z. Hu , Shiliang Li , Q. Huang , J. W. Lynn , M. A. Green , G. F. Chen , N. L. Wang
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H. A. Mook Qimiao Si Pengcheng Dai
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classification cond-mat.supr-con
keywords magneticcefeasdistortionimportantquantumarsenicarsenidecontrolling
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We use neutron scattering to show that replacing the larger arsenic with smaller phosphorus in CeFeAs(1-x)P(x)O simultaneously suppresses the AF order and orthorhombic distortion near x = 0.4, providing evidence for a magnetic quantum critical point. Furthermore, we find that the pnictogen height in iron arsenide is an important controlling parameter for their electronic and magnetic properties, and may play an important role in electron pairing and superconductivity.

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