Lattice Distortion and Magnetic Quantum Phase Transition in CeFeAs1-xPxO

  • de la Cruz C
  • Hu W
  • Li S
 et al. 
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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.

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  • C de la Cruz

  • W Z Hu

  • S L Li

  • Q Huang

  • J W Lynn

  • M A Green

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