Nodeless superconductivity in the cage-type superconductor Sc5Ru6Sn18 with preserved time-reversal symmetry

D. Kumar, C. N. Kuo, F. Astuti, T. Shang, M. K. Lee, C. S. Lue, I. Watanabe, J. A.T. Barker, T. Shiroka, L. J. Chang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We report the single-crystal synthesis and detailed investigations of the cage-type superconductor Sc5Ru6Sn18, using powder x-ray diffraction (XRD), magnetization, specific-heat and muon-spin relaxation (μSR) measurements. Sc5Ru6Sn18 crystallizes in a tetragonal structure (space group I41/acd) with lattice parameters a = 1.387(3) nm and c = 2.641(5) nm. Both DC and AC magnetization measurements prove the type-II superconductivity in Sc5Ru6Sn18 with T c ≈ 3.5(1) K, a lower critical field = 157(9) Oe and an upper critical field, = 26(1) kOe. The zero-field electronic specific-heat data are well fitted using a single-gap BCS model, with = 0.64(1) meV. The Sommerfeld constant γ varies linearly with the applied magnetic field, indicating s-wave superconductivity in Sc5Ru6Sn18. Specific-heat and transverse-field (TF) μSR measurements reveal that Sc5Ru6Sn18 is a superconductor with strong electron-phonon coupling, with TF-μSR also suggesting a single-gap s-wave character of the superconductivity. Furthermore, zero-field μSR measurements do not detect spontaneous magnetic fields below T c, hence implying that time-reversal symmetry is preserved in Sc5Ru6Sn18.

Original languageEnglish
Article number315803
JournalJournal of Physics Condensed Matter
Volume30
Issue number31
DOIs
Publication statusPublished - 2018 Jul 16

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Crystal symmetry
Superconductivity
Superconducting materials
superconductivity
Specific heat
specific heat
symmetry
Magnetization
Magnetic fields
magnetization
magnetic fields
Powders
Lattice constants
muons
lattice parameters
alternating current
x ray diffraction
Diffraction
direct current
Single crystals

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Nodeless superconductivity in the cage-type superconductor Sc5Ru6Sn18 with preserved time-reversal symmetry",
abstract = "We report the single-crystal synthesis and detailed investigations of the cage-type superconductor Sc5Ru6Sn18, using powder x-ray diffraction (XRD), magnetization, specific-heat and muon-spin relaxation (μSR) measurements. Sc5Ru6Sn18 crystallizes in a tetragonal structure (space group I41/acd) with lattice parameters a = 1.387(3) nm and c = 2.641(5) nm. Both DC and AC magnetization measurements prove the type-II superconductivity in Sc5Ru6Sn18 with T c ≈ 3.5(1) K, a lower critical field = 157(9) Oe and an upper critical field, = 26(1) kOe. The zero-field electronic specific-heat data are well fitted using a single-gap BCS model, with = 0.64(1) meV. The Sommerfeld constant γ varies linearly with the applied magnetic field, indicating s-wave superconductivity in Sc5Ru6Sn18. Specific-heat and transverse-field (TF) μSR measurements reveal that Sc5Ru6Sn18 is a superconductor with strong electron-phonon coupling, with TF-μSR also suggesting a single-gap s-wave character of the superconductivity. Furthermore, zero-field μSR measurements do not detect spontaneous magnetic fields below T c, hence implying that time-reversal symmetry is preserved in Sc5Ru6Sn18.",
author = "D. Kumar and Kuo, {C. N.} and F. Astuti and T. Shang and Lee, {M. K.} and Lue, {C. S.} and I. Watanabe and Barker, {J. A.T.} and T. Shiroka and Chang, {L. J.}",
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Nodeless superconductivity in the cage-type superconductor Sc5Ru6Sn18 with preserved time-reversal symmetry. / Kumar, D.; Kuo, C. N.; Astuti, F.; Shang, T.; Lee, M. K.; Lue, C. S.; Watanabe, I.; Barker, J. A.T.; Shiroka, T.; Chang, L. J.

In: Journal of Physics Condensed Matter, Vol. 30, No. 31, 315803, 16.07.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Nodeless superconductivity in the cage-type superconductor Sc5Ru6Sn18 with preserved time-reversal symmetry

AU - Kumar, D.

AU - Kuo, C. N.

AU - Astuti, F.

AU - Shang, T.

AU - Lee, M. K.

AU - Lue, C. S.

AU - Watanabe, I.

AU - Barker, J. A.T.

AU - Shiroka, T.

AU - Chang, L. J.

PY - 2018/7/16

Y1 - 2018/7/16

N2 - We report the single-crystal synthesis and detailed investigations of the cage-type superconductor Sc5Ru6Sn18, using powder x-ray diffraction (XRD), magnetization, specific-heat and muon-spin relaxation (μSR) measurements. Sc5Ru6Sn18 crystallizes in a tetragonal structure (space group I41/acd) with lattice parameters a = 1.387(3) nm and c = 2.641(5) nm. Both DC and AC magnetization measurements prove the type-II superconductivity in Sc5Ru6Sn18 with T c ≈ 3.5(1) K, a lower critical field = 157(9) Oe and an upper critical field, = 26(1) kOe. The zero-field electronic specific-heat data are well fitted using a single-gap BCS model, with = 0.64(1) meV. The Sommerfeld constant γ varies linearly with the applied magnetic field, indicating s-wave superconductivity in Sc5Ru6Sn18. Specific-heat and transverse-field (TF) μSR measurements reveal that Sc5Ru6Sn18 is a superconductor with strong electron-phonon coupling, with TF-μSR also suggesting a single-gap s-wave character of the superconductivity. Furthermore, zero-field μSR measurements do not detect spontaneous magnetic fields below T c, hence implying that time-reversal symmetry is preserved in Sc5Ru6Sn18.

AB - We report the single-crystal synthesis and detailed investigations of the cage-type superconductor Sc5Ru6Sn18, using powder x-ray diffraction (XRD), magnetization, specific-heat and muon-spin relaxation (μSR) measurements. Sc5Ru6Sn18 crystallizes in a tetragonal structure (space group I41/acd) with lattice parameters a = 1.387(3) nm and c = 2.641(5) nm. Both DC and AC magnetization measurements prove the type-II superconductivity in Sc5Ru6Sn18 with T c ≈ 3.5(1) K, a lower critical field = 157(9) Oe and an upper critical field, = 26(1) kOe. The zero-field electronic specific-heat data are well fitted using a single-gap BCS model, with = 0.64(1) meV. The Sommerfeld constant γ varies linearly with the applied magnetic field, indicating s-wave superconductivity in Sc5Ru6Sn18. Specific-heat and transverse-field (TF) μSR measurements reveal that Sc5Ru6Sn18 is a superconductor with strong electron-phonon coupling, with TF-μSR also suggesting a single-gap s-wave character of the superconductivity. Furthermore, zero-field μSR measurements do not detect spontaneous magnetic fields below T c, hence implying that time-reversal symmetry is preserved in Sc5Ru6Sn18.

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DO - 10.1088/1361-648X/aacf65

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