Calorimetric evidence of strong-coupling multiband superconductivity in Fe(Te0.57Se0.43) single crystal

J. Hu, T. J. Liu, B. Qian, A. Rotaru, L. Spinu, Z. Q. Mao

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Abstract

We have investigated the specific heat of optimally doped iron chalcogenide superconductor Fe(Te0.57Se0.43) with a high-quality single crystal sample. The electronic specific heat Ce of this sample has been successfully separated from the phonon contribution using the specific heat of a nonsuperconducting sample (Fe0.90Cu0.10) (Te0.57Se0.43) as a reference. The normal-state Sommerfeld coefficient γn of the superconducting sample is found to be ~26.6 mJ/mol K2, indicating intermediate electronic correlation. The temperature dependence of Ce in the superconducting state can be best fitted using a double-gap model with 2Δs(0)/kBT c=3.92 and 2Δl(0)/kBTc=5.84. The large gap magnitudes derived from fitting, as well as the large specific heat jump of ΔCe(Tc)/γnT c~2.11, indicate strong-coupling superconductivity. Furthermore, the magnetic field dependence of specific heat shows strong evidence for multiband superconductivity.

Original languageEnglish (US)
Article number134521
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number13
DOIs
StatePublished - Apr 27 2011

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Superconductivity
Specific heat
superconductivity
specific heat
Single crystals
single crystals
electronics
Superconducting materials
Iron
Magnetic fields
iron
temperature dependence
coefficients
magnetic fields
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Calorimetric evidence of strong-coupling multiband superconductivity in Fe(Te0.57Se0.43) single crystal",
abstract = "We have investigated the specific heat of optimally doped iron chalcogenide superconductor Fe(Te0.57Se0.43) with a high-quality single crystal sample. The electronic specific heat Ce of this sample has been successfully separated from the phonon contribution using the specific heat of a nonsuperconducting sample (Fe0.90Cu0.10) (Te0.57Se0.43) as a reference. The normal-state Sommerfeld coefficient γn of the superconducting sample is found to be ~26.6 mJ/mol K2, indicating intermediate electronic correlation. The temperature dependence of Ce in the superconducting state can be best fitted using a double-gap model with 2Δs(0)/kBT c=3.92 and 2Δl(0)/kBTc=5.84. The large gap magnitudes derived from fitting, as well as the large specific heat jump of ΔCe(Tc)/γnT c~2.11, indicate strong-coupling superconductivity. Furthermore, the magnetic field dependence of specific heat shows strong evidence for multiband superconductivity.",
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Calorimetric evidence of strong-coupling multiband superconductivity in Fe(Te0.57Se0.43) single crystal. / Hu, J.; Liu, T. J.; Qian, B.; Rotaru, A.; Spinu, L.; Mao, Z. Q.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 83, No. 13, 134521, 27.04.2011.

Research output: Contribution to journalArticle

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AU - Liu, T. J.

AU - Qian, B.

AU - Rotaru, A.

AU - Spinu, L.

AU - Mao, Z. Q.

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