Fully gapped superconductivity in SrNi2P2

Nobuyuki Kurita; Filip Ronning; Corneliu F. Miclea; Eric D. Bauer; Krzysztof Gofryk; J. D. Thompson; Roman Movshovich

doi:10.1103/PhysRevB.83.094527

Fully gapped superconductivity in SrNi₂P₂

Nobuyuki Kurita, Filip Ronning, Corneliu F. Miclea, Eric D. Bauer, Krzysztof Gofryk, J. D. Thompson, Roman Movshovich

Nuclear Science & Technology

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Abstract

We investigated the superconducting gap structure of SrNi₂P ₂ (T_c=1.4 K) via low-temperature magnetothermal conductivity κ(T,H) measurements. Zero field thermal conductivity κ decreases exponentially κ exp(-aT_c/T) with a= 1.5, in accord with the BCS theory, and rolls over to a phonon-like κT3 behavior at low temperature, similar to a number of conventional s-wave superconductors. In addition, we observed a "concave" field dependence of the residual linear term κ₀(H)/T. These facts strongly rule out the presence of nodes in the superconducting energy gap of SrNi₂P₂. Together with a fully gapped Fermi surface in the superconducting state of BaNi₂As₂ (T_c= 0.6-0.7 K), demonstrated in our recent work, these results lead us to stipulate that fully gapped superconductivity is likely to be a universal feature of Ni-based pnictide superconductors.

Original language	English
Article number	094527
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.83.094527
State	Published - Mar 23 2011

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abstract = "We investigated the superconducting gap structure of SrNi2P 2 (Tc=1.4 K) via low-temperature magnetothermal conductivity κ(T,H) measurements. Zero field thermal conductivity κ decreases exponentially κ exp(-aTc/T) with a= 1.5, in accord with the BCS theory, and rolls over to a phonon-like κT3 behavior at low temperature, similar to a number of conventional s-wave superconductors. In addition, we observed a {"}concave{"} field dependence of the residual linear term κ0(H)/T. These facts strongly rule out the presence of nodes in the superconducting energy gap of SrNi2P2. Together with a fully gapped Fermi surface in the superconducting state of BaNi2As2 (Tc= 0.6-0.7 K), demonstrated in our recent work, these results lead us to stipulate that fully gapped superconductivity is likely to be a universal feature of Ni-based pnictide superconductors.",

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AU - Kurita, Nobuyuki

AU - Ronning, Filip

AU - Miclea, Corneliu F.

AU - Bauer, Eric D.

AU - Gofryk, Krzysztof

AU - Thompson, J. D.

AU - Movshovich, Roman

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AB - We investigated the superconducting gap structure of SrNi2P 2 (Tc=1.4 K) via low-temperature magnetothermal conductivity κ(T,H) measurements. Zero field thermal conductivity κ decreases exponentially κ exp(-aTc/T) with a= 1.5, in accord with the BCS theory, and rolls over to a phonon-like κT3 behavior at low temperature, similar to a number of conventional s-wave superconductors. In addition, we observed a "concave" field dependence of the residual linear term κ0(H)/T. These facts strongly rule out the presence of nodes in the superconducting energy gap of SrNi2P2. Together with a fully gapped Fermi surface in the superconducting state of BaNi2As2 (Tc= 0.6-0.7 K), demonstrated in our recent work, these results lead us to stipulate that fully gapped superconductivity is likely to be a universal feature of Ni-based pnictide superconductors.

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Fully gapped superconductivity in SrNi₂P₂

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