Anisotropic H c2 up to 92 T and the signature of multiband superconductivity in Ca 10(Pt 4As 8)((Fe 1-xPt x) 2As 2) 5

Eundeok Mun, Ni Ni, Jared M. Allred, Robert J. Cava, Oscar Ayala, Ross D. McDonald, Neil Harrison, Vivien S. Zapf

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The upper critical fields H c2(T) of single crystals of the superconductor Ca 10(Pt 4-δAs 8)((Fe 0.97Pt 0.03) 2As 2) 5 (δ0.246) are determined over a wide range of temperatures down to T=1.42 K and magnetic fields of up to μ 0H92 T. The measurements of anisotropic H c2(T) curves are performed in pulsed magnetic fields using radio-frequency contactless penetration depth measurements for magnetic field applied both parallel and perpendicular to the ab plane. Whereas a clear upward curvature in Hc2(T) along Hc is observed with decreasing temperature, the Hc2ab(T) along Hab shows a flattening at low temperatures. The rapid increase of the Hc2c(T) at low temperatures suggests that the superconductivity can be described by two dominating bands. The anisotropy parameter γ HHc2ab/Hc2c is ∼7 close to T c and decreases considerably to ∼1 with decreasing temperature, showing rather weak anisotropy at low temperatures.

Original languageEnglish (US)
Article number100502
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
StatePublished - Mar 5 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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