2013/10/14 by M. D. Watson, Matthew D. Watson, A. McCollam +16 · 1 citation
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.89.205136
published as Phys. Rev. B 89, 205136 (2014) · Latex, 4 figures
arxiv created 2013/10/14 · openalex publication_date 2014/05/30 · arxiv updated 2014/06/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report a high magnetic field study up to 55 T of the parent and the nearly optimally doped iron-pnictide superconductor Ca10(Pt3As8)((Fe_1\ensuremath-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.