Field-induced magnetic instability within a superconducting condensate

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Science Advances  19 May 2017:
Vol. 3, no. 5, e1602055
DOI: 10.1126/sciadv.1602055

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The application of magnetic fields, chemical substitution, or hydrostatic pressure to strongly correlated electron materials can stabilize electronic phases with different organizational principles. We present evidence for a field-induced quantum phase transition, in superconducting Nd0.05Ce0.95CoIn5, that separates two antiferromagnetic phases with identical magnetic symmetry. At zero field, we find a spin-density wave that is suppressed at the critical field μ0H* = 8 T. For H > H*, a spin-density phase emerges and shares many properties with the Q phase in CeCoIn5. These results suggest that the magnetic instability is not magnetically driven, and we propose that it is driven by a modification of superconducting condensate at H*.

  • Condensed Matter Physics
  • quantum phase transitions
  • superconductivity
  • magnetism
  • neutron scattering
  • strongly correlated electron systems
  • low temperature physics
  • diffraction
  • scaling

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