Determination of the superconducting gap structure in all bands of the spin-triplet superconductor Sr2RuO4

K. Deguchi, Z. Q. Mao, Y. Maeno

Research output: Contribution to journalArticle

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Abstract

We have obtained strong experimental evidence for the full determination of the superconducting gap structure in all three bands of the spin-triplet superconductor Sr2RuO4 for the first time. We have extended the measurements of the field-orientation dependent specific heat to include conical field rotations consisting of in-plane azimuthal angle φ-sweeps at various polar angles θ performed down to 0.1 K. Clear 4-fold oscillations of the specific heat and a rapid suppression of it by changing θ are explained only by a compensation from two types of bands with anti-phase gap anisotropies with each other. The results indicate that the active band, responsible for the superconducting instability, is the γ-band with the lines of gap minima along the [100] directions, and the passive band is the α- and β-bands with the lines of gap minima or zeros along the [110] directions in their induced superconducting gaps. We also demonstrated the scaling of the specific heat for the field in the c-direction, which supports the line-node-like gap structures running along the kz direction.

Original languageEnglish (US)
Pages (from-to)1313-1321
Number of pages9
JournalJournal of the Physical Society of Japan
Volume73
Issue number5
DOIs
StatePublished - May 1 2004

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specific heat
sweep angle
retarding
scaling
oscillations
anisotropy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Determination of the superconducting gap structure in all bands of the spin-triplet superconductor Sr2RuO4",
abstract = "We have obtained strong experimental evidence for the full determination of the superconducting gap structure in all three bands of the spin-triplet superconductor Sr2RuO4 for the first time. We have extended the measurements of the field-orientation dependent specific heat to include conical field rotations consisting of in-plane azimuthal angle φ-sweeps at various polar angles θ performed down to 0.1 K. Clear 4-fold oscillations of the specific heat and a rapid suppression of it by changing θ are explained only by a compensation from two types of bands with anti-phase gap anisotropies with each other. The results indicate that the active band, responsible for the superconducting instability, is the γ-band with the lines of gap minima along the [100] directions, and the passive band is the α- and β-bands with the lines of gap minima or zeros along the [110] directions in their induced superconducting gaps. We also demonstrated the scaling of the specific heat for the field in the c-direction, which supports the line-node-like gap structures running along the kz direction.",
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Determination of the superconducting gap structure in all bands of the spin-triplet superconductor Sr2RuO4. / Deguchi, K.; Mao, Z. Q.; Maeno, Y.

In: Journal of the Physical Society of Japan, Vol. 73, No. 5, 01.05.2004, p. 1313-1321.

Research output: Contribution to journalArticle

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AU - Mao, Z. Q.

AU - Maeno, Y.

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N2 - We have obtained strong experimental evidence for the full determination of the superconducting gap structure in all three bands of the spin-triplet superconductor Sr2RuO4 for the first time. We have extended the measurements of the field-orientation dependent specific heat to include conical field rotations consisting of in-plane azimuthal angle φ-sweeps at various polar angles θ performed down to 0.1 K. Clear 4-fold oscillations of the specific heat and a rapid suppression of it by changing θ are explained only by a compensation from two types of bands with anti-phase gap anisotropies with each other. The results indicate that the active band, responsible for the superconducting instability, is the γ-band with the lines of gap minima along the [100] directions, and the passive band is the α- and β-bands with the lines of gap minima or zeros along the [110] directions in their induced superconducting gaps. We also demonstrated the scaling of the specific heat for the field in the c-direction, which supports the line-node-like gap structures running along the kz direction.

AB - We have obtained strong experimental evidence for the full determination of the superconducting gap structure in all three bands of the spin-triplet superconductor Sr2RuO4 for the first time. We have extended the measurements of the field-orientation dependent specific heat to include conical field rotations consisting of in-plane azimuthal angle φ-sweeps at various polar angles θ performed down to 0.1 K. Clear 4-fold oscillations of the specific heat and a rapid suppression of it by changing θ are explained only by a compensation from two types of bands with anti-phase gap anisotropies with each other. The results indicate that the active band, responsible for the superconducting instability, is the γ-band with the lines of gap minima along the [100] directions, and the passive band is the α- and β-bands with the lines of gap minima or zeros along the [110] directions in their induced superconducting gaps. We also demonstrated the scaling of the specific heat for the field in the c-direction, which supports the line-node-like gap structures running along the kz direction.

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