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

doi:10.1103/PhysRevB.85.100502

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

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

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 language	English (US)
Article number	100502
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	85
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.85.100502
State	Published - Mar 5 2012

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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@article{e70448d394f446bf8ec085c5f5be00fe,

title = "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 ",

abstract = "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.",

author = "Eundeok Mun and Ni Ni and Allred, {Jared M.} and Cava, {Robert J.} and Oscar Ayala and McDonald, {Ross D.} and Neil Harrison and Zapf, {Vivien S.}",

year = "2012",

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doi = "10.1103/PhysRevB.85.100502",

language = "English (US)",

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journal = "Physical Review B - Condensed Matter and Materials Physics",

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T1 - 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

AU - Mun, Eundeok

AU - Ni, Ni

AU - Allred, Jared M.

AU - Cava, Robert J.

AU - Ayala, Oscar

AU - McDonald, Ross D.

AU - Harrison, Neil

AU - Zapf, Vivien S.

PY - 2012/3/5

Y1 - 2012/3/5

N2 - 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.

AB - 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.

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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

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