Distorted superconducting nodal line on a single Fermi surface in the anisotropic organic superconductor λ-(BETS)2GaCl4

Dita Puspita Sari; Retno Asih; Ko Ichi Hiraki; Takehito Nakano; Yasuo Nozue; Yasuyuki Ishii; Adrian D. Hillier; Isao Watanabe

doi:10.1103/PhysRevB.104.224506

Distorted superconducting nodal line on a single Fermi surface in the anisotropic organic superconductor λ-(BETS)2GaCl4

Dita Puspita Sari, Retno Asih, Ko Ichi Hiraki, Takehito Nakano, Yasuo Nozue, Yasuyuki Ishii, Adrian D. Hillier, Isao Watanabe

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Abstract

The superconducting (SC) gap structure appearing in systems with single Fermi surface (FS) is generally described by the single gap function with s- or d-wave symmetry. The organic superconductor λ-(BETS)2GaCl4 [BETS = (CH2)2S2Se2C6Se2S2(CH2)2] endeavors to examine a novel SC gap structure on the distorted single cylindrical FS. Here, we show an example of the formation of the distorted SC nodal line by using the positive muon spin rotation (μ+SR) spectroscopy on λ-(BETS)2GaCl4. Our analysis method of the μ+SR data reveals that the nodal line has a narrower width than that of the traditional d-wave by the steepness factor of 4.6(2.1), and a flat part with the maximum gap exists. We found that the amplitude of the SC gap is 2Δ/kBTc = 3.9(2) and the in-plane penetration depth is λac(0) = 560(5) nm. Our present study gives insight into the relation of the FS distortion and the unusual Cooper pair formation mediated by the anisotropic spin fluctuations.

Original language	English
Article number	224506
Journal	Physical Review B
Volume	104
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.104.224506
Publication status	Published - 2021 Dec 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Distorted superconducting nodal line on a single Fermi surface in the anisotropic organic superconductor λ-(BETS)2GaCl4",

abstract = "The superconducting (SC) gap structure appearing in systems with single Fermi surface (FS) is generally described by the single gap function with s- or d-wave symmetry. The organic superconductor λ-(BETS)2GaCl4 [BETS = (CH2)2S2Se2C6Se2S2(CH2)2] endeavors to examine a novel SC gap structure on the distorted single cylindrical FS. Here, we show an example of the formation of the distorted SC nodal line by using the positive muon spin rotation (μ+SR) spectroscopy on λ-(BETS)2GaCl4. Our analysis method of the μ+SR data reveals that the nodal line has a narrower width than that of the traditional d-wave by the steepness factor of 4.6(2.1), and a flat part with the maximum gap exists. We found that the amplitude of the SC gap is 2Δ/kBTc = 3.9(2) and the in-plane penetration depth is λac(0) = 560(5) nm. Our present study gives insight into the relation of the FS distortion and the unusual Cooper pair formation mediated by the anisotropic spin fluctuations.",

author = "Sari, {Dita Puspita} and Retno Asih and Hiraki, {Ko Ichi} and Takehito Nakano and Yasuo Nozue and Yasuyuki Ishii and Hillier, {Adrian D.} and Isao Watanabe",

note = "Funding Information: We acknowledge H. Aizawa, T. Koretsune, H. Seo, K. Kuroki, Y. Nakazawa, M. Hagiwara, S. Nakosai, M. Ogata, and M. Iwasaki for helpful discussion and A. Berlie and F. L. Pratt for experimental support. This work is supported by the Junior Research Associate Fellowship RIKEN Program, LPDP Scholarship of Indonesia, and partly supported by JSPS/MEXT Grants-in-Aids for Scientific Research (KAKENHI) Grant No. JP18K03526. Publisher Copyright: Published by the American Physical Society",

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T1 - Distorted superconducting nodal line on a single Fermi surface in the anisotropic organic superconductor λ-(BETS)2GaCl4

AU - Sari, Dita Puspita

AU - Asih, Retno

AU - Hiraki, Ko Ichi

AU - Nakano, Takehito

AU - Nozue, Yasuo

AU - Ishii, Yasuyuki

AU - Hillier, Adrian D.

AU - Watanabe, Isao

N1 - Funding Information: We acknowledge H. Aizawa, T. Koretsune, H. Seo, K. Kuroki, Y. Nakazawa, M. Hagiwara, S. Nakosai, M. Ogata, and M. Iwasaki for helpful discussion and A. Berlie and F. L. Pratt for experimental support. This work is supported by the Junior Research Associate Fellowship RIKEN Program, LPDP Scholarship of Indonesia, and partly supported by JSPS/MEXT Grants-in-Aids for Scientific Research (KAKENHI) Grant No. JP18K03526. Publisher Copyright: Published by the American Physical Society

PY - 2021/12/1

Y1 - 2021/12/1

N2 - The superconducting (SC) gap structure appearing in systems with single Fermi surface (FS) is generally described by the single gap function with s- or d-wave symmetry. The organic superconductor λ-(BETS)2GaCl4 [BETS = (CH2)2S2Se2C6Se2S2(CH2)2] endeavors to examine a novel SC gap structure on the distorted single cylindrical FS. Here, we show an example of the formation of the distorted SC nodal line by using the positive muon spin rotation (μ+SR) spectroscopy on λ-(BETS)2GaCl4. Our analysis method of the μ+SR data reveals that the nodal line has a narrower width than that of the traditional d-wave by the steepness factor of 4.6(2.1), and a flat part with the maximum gap exists. We found that the amplitude of the SC gap is 2Δ/kBTc = 3.9(2) and the in-plane penetration depth is λac(0) = 560(5) nm. Our present study gives insight into the relation of the FS distortion and the unusual Cooper pair formation mediated by the anisotropic spin fluctuations.

AB - The superconducting (SC) gap structure appearing in systems with single Fermi surface (FS) is generally described by the single gap function with s- or d-wave symmetry. The organic superconductor λ-(BETS)2GaCl4 [BETS = (CH2)2S2Se2C6Se2S2(CH2)2] endeavors to examine a novel SC gap structure on the distorted single cylindrical FS. Here, we show an example of the formation of the distorted SC nodal line by using the positive muon spin rotation (μ+SR) spectroscopy on λ-(BETS)2GaCl4. Our analysis method of the μ+SR data reveals that the nodal line has a narrower width than that of the traditional d-wave by the steepness factor of 4.6(2.1), and a flat part with the maximum gap exists. We found that the amplitude of the SC gap is 2Δ/kBTc = 3.9(2) and the in-plane penetration depth is λac(0) = 560(5) nm. Our present study gives insight into the relation of the FS distortion and the unusual Cooper pair formation mediated by the anisotropic spin fluctuations.

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Distorted superconducting nodal line on a single Fermi surface in the anisotropic organic superconductor λ-(BETS)2GaCl4

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