Full-gap superconductivity in noncentrosymmetric Re6Zr,Re27Zr5, and Re24Zr5

K. Matano; R. Yatagai; S. Maeda; Guo Qing Zheng

doi:10.1103/PhysRevB.94.214513

Full-gap superconductivity in noncentrosymmetric Re6Zr,Re27Zr5, and Re24Zr5

K. Matano, R. Yatagai, S. Maeda, Guo Qing Zheng

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

21 Citations (Scopus)

Abstract

The noncentrosymmetric superconductor Re6Zr has attracted much interest for its possible unconventional superconducting state with broken time-reversal symmetry. Here we report Re185/187 nuclear quadrupole resonance measurements on Re6Zr (Tc=6.72 K) and the isostructural compounds Re27Zr5 (Tc=6.53 K) and Re24Zr5 (Tc=5.00 K). The nuclear spin-lattice relaxation rate 1/T1 shows a coherence peak below Tc and decreases exponentially at low temperatures in all three samples. The superconducting gap Δ derived from the 1/T1 data is 2Δ=3.58kBTc,3.55kBTc, and 3.51kBTc for Re6Zr,Re27Zr5, and Re24Zr5, respectively, which is close to the value of 3.53kBTc expected for weak-coupling superconductivity. These data suggest conventional s-wave superconductivity with a fully opened gap in this series of compounds.

Original language	English
Article number	214513
Journal	Physical Review B
Volume	94
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.94.214513
Publication status	Published - Dec 21 2016

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Full-gap superconductivity in noncentrosymmetric Re6Zr,Re27Zr5, and Re24Zr5",

abstract = "The noncentrosymmetric superconductor Re6Zr has attracted much interest for its possible unconventional superconducting state with broken time-reversal symmetry. Here we report Re185/187 nuclear quadrupole resonance measurements on Re6Zr (Tc=6.72 K) and the isostructural compounds Re27Zr5 (Tc=6.53 K) and Re24Zr5 (Tc=5.00 K). The nuclear spin-lattice relaxation rate 1/T1 shows a coherence peak below Tc and decreases exponentially at low temperatures in all three samples. The superconducting gap Δ derived from the 1/T1 data is 2Δ=3.58kBTc,3.55kBTc, and 3.51kBTc for Re6Zr,Re27Zr5, and Re24Zr5, respectively, which is close to the value of 3.53kBTc expected for weak-coupling superconductivity. These data suggest conventional s-wave superconductivity with a fully opened gap in this series of compounds.",

author = "K. Matano and R. Yatagai and S. Maeda and Zheng, {Guo Qing}",

note = "Funding Information: This work was supported by Research Grant No. JP15H05852 (Innovative Areas Topological Materials Science) from MEXT and Grant No. JP16H04016 from JSPS. Publisher Copyright: {\textcopyright} 2016 American Physical Society.",

year = "2016",

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doi = "10.1103/PhysRevB.94.214513",

language = "English",

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AU - Matano, K.

AU - Yatagai, R.

AU - Maeda, S.

AU - Zheng, Guo Qing

N1 - Funding Information: This work was supported by Research Grant No. JP15H05852 (Innovative Areas Topological Materials Science) from MEXT and Grant No. JP16H04016 from JSPS. Publisher Copyright: © 2016 American Physical Society.

PY - 2016/12/21

Y1 - 2016/12/21

N2 - The noncentrosymmetric superconductor Re6Zr has attracted much interest for its possible unconventional superconducting state with broken time-reversal symmetry. Here we report Re185/187 nuclear quadrupole resonance measurements on Re6Zr (Tc=6.72 K) and the isostructural compounds Re27Zr5 (Tc=6.53 K) and Re24Zr5 (Tc=5.00 K). The nuclear spin-lattice relaxation rate 1/T1 shows a coherence peak below Tc and decreases exponentially at low temperatures in all three samples. The superconducting gap Δ derived from the 1/T1 data is 2Δ=3.58kBTc,3.55kBTc, and 3.51kBTc for Re6Zr,Re27Zr5, and Re24Zr5, respectively, which is close to the value of 3.53kBTc expected for weak-coupling superconductivity. These data suggest conventional s-wave superconductivity with a fully opened gap in this series of compounds.

AB - The noncentrosymmetric superconductor Re6Zr has attracted much interest for its possible unconventional superconducting state with broken time-reversal symmetry. Here we report Re185/187 nuclear quadrupole resonance measurements on Re6Zr (Tc=6.72 K) and the isostructural compounds Re27Zr5 (Tc=6.53 K) and Re24Zr5 (Tc=5.00 K). The nuclear spin-lattice relaxation rate 1/T1 shows a coherence peak below Tc and decreases exponentially at low temperatures in all three samples. The superconducting gap Δ derived from the 1/T1 data is 2Δ=3.58kBTc,3.55kBTc, and 3.51kBTc for Re6Zr,Re27Zr5, and Re24Zr5, respectively, which is close to the value of 3.53kBTc expected for weak-coupling superconductivity. These data suggest conventional s-wave superconductivity with a fully opened gap in this series of compounds.

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Full-gap superconductivity in noncentrosymmetric Re6Zr,Re27Zr5, and Re24Zr5

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