Field-induced magnetic transitions in Ca10(Pt3As8)((Fe1 xPtx)2As2)5 compounds

M. D. Watson, A. McCollam, S. F. Blake, D. Vignolles, L. Drigo, I. I. Mazin, D. Guterding, H. O. Jeschke, R. Valentí, N. Ni, R. Cava, A. I. Coldea

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15 Scopus citations


We report a high magnetic field study up to 55 T of the parent and the nearly optimally doped iron-pnictide superconductor Ca10(Pt3As8)((Fe1 xPtx)2As2)5 [x=0 and 0.078(6)] using magnetic torque, tunnel diode oscillator technique, and transport measurements. We determine the superconducting phase diagram, revealing an anisotropy of the irreversibility field up to a factor of 10 near Tc and signatures of multiband superconductivity. Unexpectedly, we find a prominent anomaly in magnetic torque close to 22 T, when the magnetic field is applied perpendicular to the (ab) planes, which becomes significantly more pronounced as the temperature is lowered to 0.33 K. We suggest that this field-induced transition, observed both in the magnetically ordered parent compound and a nonordered superconducting sample, is a signature of a spin-flop-like transition associated not with long-range order but driven by antiferromagnetic fluctuations of magnetic moments aligned preferentially out of the conducting planes at low temperatures.

Original languageEnglish (US)
Article number205136
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number20
StatePublished - May 30 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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