Full gap superconductivity in Ba 0:6K 0:4Fe 2As 2 probed by muon spin rotation

Masatoshi Hiraishi; Ryosuke Kadono; Soshi Takeshita; Masanori Miyazaki; Akihiro Koda; Hirotaka Okabe; Jun Akimitsu

doi:10.1143/JPSJ.78.023710

Full gap superconductivity in Ba _0:6K _0:4Fe ₂As ₂ probed by muon spin rotation

Masatoshi Hiraishi, Ryosuke Kadono, Soshi Takeshita, Masanori Miyazaki, Akihiro Koda, Hirotaka Okabe, Jun Akimitsu

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

36 Citations (Scopus)

Abstract

Superfluid density (n _s) in the mixed state of an iron pnictide superconductor Ba _1-xK _xFe ₂As ₂ is determined by muon spin rotation for a sample with optimal doping (x = 0:4). The temperature dependence of n _s is perfectly reproduced using the conventional BCS model for s-wave paring, where the order parameter can be either a single-gap structure with Δ = 8:35(6) meV [2Δ/k _BT _c = 5:09(4)] or double-gap structure with Δ ₁ = 12 meV (fixed) [2Δ ₁/k _BT _c = 7:3] and Δ ₂ = 6:8(3) meV [2Δ ₂/ k _BT _c = 4:1(2)]. The latter is consistent with the recent result obtained by the angle-resolved photoemission spectroscopy. The large gap parameters (2Δ/k _BT _c) indicate the extremely strong coupling of carriers to bosons that mediate the Cooper pairing.

Original language	English
Article number	023710
Journal	journal of the physical society of japan
Volume	78
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.78.023710
Publication status	Published - 2009 Feb
Externally published	Yes

Keywords

Muon spin rotation
Order parameter
Oxypnictide superconductor

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.78.023710

Cite this

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title = "Full gap superconductivity in Ba 0:6K 0:4Fe 2As 2 probed by muon spin rotation",

abstract = "Superfluid density (n s) in the mixed state of an iron pnictide superconductor Ba 1-xK xFe 2As 2 is determined by muon spin rotation for a sample with optimal doping (x = 0:4). The temperature dependence of n s is perfectly reproduced using the conventional BCS model for s-wave paring, where the order parameter can be either a single-gap structure with Δ = 8:35(6) meV [2Δ/k BT c = 5:09(4)] or double-gap structure with Δ 1 = 12 meV (fixed) [2Δ 1/k BT c = 7:3] and Δ 2 = 6:8(3) meV [2Δ 2/ k BT c = 4:1(2)]. The latter is consistent with the recent result obtained by the angle-resolved photoemission spectroscopy. The large gap parameters (2Δ/k BT c) indicate the extremely strong coupling of carriers to bosons that mediate the Cooper pairing.",

keywords = "Muon spin rotation, Order parameter, Oxypnictide superconductor",

author = "Masatoshi Hiraishi and Ryosuke Kadono and Soshi Takeshita and Masanori Miyazaki and Akihiro Koda and Hirotaka Okabe and Jun Akimitsu",

year = "2009",

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T1 - Full gap superconductivity in Ba 0:6K 0:4Fe 2As 2 probed by muon spin rotation

AU - Hiraishi, Masatoshi

AU - Kadono, Ryosuke

AU - Takeshita, Soshi

AU - Miyazaki, Masanori

AU - Koda, Akihiro

AU - Okabe, Hirotaka

AU - Akimitsu, Jun

PY - 2009/2

Y1 - 2009/2

N2 - Superfluid density (n s) in the mixed state of an iron pnictide superconductor Ba 1-xK xFe 2As 2 is determined by muon spin rotation for a sample with optimal doping (x = 0:4). The temperature dependence of n s is perfectly reproduced using the conventional BCS model for s-wave paring, where the order parameter can be either a single-gap structure with Δ = 8:35(6) meV [2Δ/k BT c = 5:09(4)] or double-gap structure with Δ 1 = 12 meV (fixed) [2Δ 1/k BT c = 7:3] and Δ 2 = 6:8(3) meV [2Δ 2/ k BT c = 4:1(2)]. The latter is consistent with the recent result obtained by the angle-resolved photoemission spectroscopy. The large gap parameters (2Δ/k BT c) indicate the extremely strong coupling of carriers to bosons that mediate the Cooper pairing.

AB - Superfluid density (n s) in the mixed state of an iron pnictide superconductor Ba 1-xK xFe 2As 2 is determined by muon spin rotation for a sample with optimal doping (x = 0:4). The temperature dependence of n s is perfectly reproduced using the conventional BCS model for s-wave paring, where the order parameter can be either a single-gap structure with Δ = 8:35(6) meV [2Δ/k BT c = 5:09(4)] or double-gap structure with Δ 1 = 12 meV (fixed) [2Δ 1/k BT c = 7:3] and Δ 2 = 6:8(3) meV [2Δ 2/ k BT c = 4:1(2)]. The latter is consistent with the recent result obtained by the angle-resolved photoemission spectroscopy. The large gap parameters (2Δ/k BT c) indicate the extremely strong coupling of carriers to bosons that mediate the Cooper pairing.

KW - Muon spin rotation

KW - Order parameter

KW - Oxypnictide superconductor

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