Nodal superconductivity in isovalently substituted SrFe2(As 1-xPx)2 pnictide superconductor at the optimal doping x=0.35

J. Murphy; C. P. Strehlow; K. Cho; M. A. Tanatar; N. Salovich; R. W. Giannetta; T. Kobayashi; S. Miyasaka; S. Tajima; R. Prozorov

doi:10.1103/PhysRevB.87.140505

Nodal superconductivity in isovalently substituted SrFe₂(As _1-xP_x)₂ pnictide superconductor at the optimal doping x=0.35

J. Murphy, C. P. Strehlow, K. Cho, M. A. Tanatar, N. Salovich, R. W. Giannetta, T. Kobayashi, S. Miyasaka, S. Tajima, R. Prozorov

Physics

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

Abstract

Temperature-dependent London penetration depth λ(T) was measured in optimally doped x=0.35, as-grown [T_c≈25 K, RRR=ρ(300K)/ ρ(T_c)=4.5], and annealed (T_c≈35 K, RRR=6.4) single crystals of SrFe₂(As_1-xP_x)₂ iron-based superconductor. Annealing increases the residual resistivity ratio (RRR) and decreases the absolute value of the London penetration depth from λ(0)=300±10 nm in the as-grown sample to λ(0)=275±10 nm. At low temperatures, λ(T)∼T indicating a superconducting gap with line nodes. Analysis of the full-temperature range superfluid density is consistent with the line nodes, but differs from the simple single-gap d wave. The observed behavior is very similar to that of BaFe₂(As _1-xP_x)₂, showing that isovalently substituted pnictides are inherently different from the charge-doped materials.

Original language	English (US)
Article number	140505
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	87
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.87.140505
State	Published - Apr 16 2013

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.87.140505

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Murphy, J., Strehlow, C. P., Cho, K., Tanatar, M. A., Salovich, N., Giannetta, R. W., Kobayashi, T., Miyasaka, S., Tajima, S., & Prozorov, R. (2013). Nodal superconductivity in isovalently substituted SrFe₂(As _1-xP_x)₂ pnictide superconductor at the optimal doping x=0.35. Physical Review B - Condensed Matter and Materials Physics, 87(14), Article 140505. https://doi.org/10.1103/PhysRevB.87.140505

Murphy, J, Strehlow, CP, Cho, K, Tanatar, MA, Salovich, N, Giannetta, RW, Kobayashi, T, Miyasaka, S, Tajima, S & Prozorov, R 2013, 'Nodal superconductivity in isovalently substituted SrFe₂(As _1-xP_x)₂ pnictide superconductor at the optimal doping x=0.35', Physical Review B - Condensed Matter and Materials Physics, vol. 87, no. 14, 140505. https://doi.org/10.1103/PhysRevB.87.140505

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abstract = "Temperature-dependent London penetration depth λ(T) was measured in optimally doped x=0.35, as-grown [Tc≈25 K, RRR=ρ(300K)/ ρ(Tc)=4.5], and annealed (Tc≈35 K, RRR=6.4) single crystals of SrFe2(As1-xPx)2 iron-based superconductor. Annealing increases the residual resistivity ratio (RRR) and decreases the absolute value of the London penetration depth from λ(0)=300±10 nm in the as-grown sample to λ(0)=275±10 nm. At low temperatures, λ(T)∼T indicating a superconducting gap with line nodes. Analysis of the full-temperature range superfluid density is consistent with the line nodes, but differs from the simple single-gap d wave. The observed behavior is very similar to that of BaFe2(As 1-xPx)2, showing that isovalently substituted pnictides are inherently different from the charge-doped materials.",

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AU - Cho, K.

AU - Tanatar, M. A.

AU - Salovich, N.

AU - Giannetta, R. W.

AU - Kobayashi, T.

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