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

Author(s): Watson, Matthew D.; McCollam, Alix; Blake, Samuel F.; Vignolles, David; Drigo, Loïc; et al

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Abstract: 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. © 2014 American Physical Society.
Publication Date: May-2014
Electronic Publication Date: 30-May-2014
Citation: Watson, Matthew D., McCollam, Alix, Blake, Samuel F., Vignolles, David, Drigo, Loïc, Mazin, Igor I., Guterding, Daniel, Jeschke, Harald O., Valentí, Roser, Ni, Ni, Cava, Robert J., Coldea, Amalia I. (2014). Field-induced magnetic transitions in Ca10(Pt3As8)((Fe1 xPtx)2As2)5 compounds. Physical Review B - Condensed Matter and Materials Physics, 89 (20), 10.1103/PhysRevB.89.205136
DOI: doi:10.1103/PhysRevB.89.205136
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 89.20:205136-1 - 205136-9
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B - Condensed Matter and Materials Physics
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Physical Review B - Condensed Matter and Materials Physics. Volume 89, Issue 20, 30 May 2014, Article number 205136.

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