Two S-wave gap symmetry for single crystals of the superconductor BaFe 1.8Co0.2As2

Ki Young Choi; Soo Hyun Kim; Changho Choi; Myung Hwa Jung; X. F. Wang; X. H. Chen; Jae Dong Noh; Sung Ik Lee

doi:10.1016/j.physc.2009.11.150

Two S-wave gap symmetry for single crystals of the superconductor BaFe _1.8Co_0.2As₂

Ki Young Choi, Soo Hyun Kim, Changho Choi, Myung Hwa Jung, X. F. Wang, X. H. Chen, Jae Dong Noh, Sung Ik Lee

Department of Physics

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

4 Scopus citations

Abstract

To clarify the gap structure of the iron-pnictide superconductors, we synthesized optimally doped single crystals of BaFe_1.8Co _0.2As₂, which had a critical temperature, T_c, of 23.6 K. The initial M-H curve was used to find the lower critical field, H_c1. The full range of the temperature dependence of H_c1 was explained by using a two S-wave gap symmetry. We estimate the two gap as Δ₁(0) = 1.64 ± 0.2 meV for the small gap and Δ₂(0) = 6.20 ± 0.2 meV for the large gap.

Original language	English
Pages (from-to)	S506-S507
Journal	Physica C: Superconductivity and its Applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.11.150
State	Published - Dec 2010

Keywords

FeAs
Iron-based superconductor
Lower critical field
S-wave gap

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10.1016/j.physc.2009.11.150

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title = "Two S-wave gap symmetry for single crystals of the superconductor BaFe 1.8Co0.2As2",

abstract = "To clarify the gap structure of the iron-pnictide superconductors, we synthesized optimally doped single crystals of BaFe1.8Co 0.2As2, which had a critical temperature, Tc, of 23.6 K. The initial M-H curve was used to find the lower critical field, Hc1. The full range of the temperature dependence of Hc1 was explained by using a two S-wave gap symmetry. We estimate the two gap as Δ1(0) = 1.64 ± 0.2 meV for the small gap and Δ2(0) = 6.20 ± 0.2 meV for the large gap.",

keywords = "FeAs, Iron-based superconductor, Lower critical field, S-wave gap",

author = "Choi, {Ki Young} and Kim, {Soo Hyun} and Changho Choi and Jung, {Myung Hwa} and Wang, {X. F.} and Chen, {X. H.} and Noh, {Jae Dong} and Lee, {Sung Ik}",

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doi = "10.1016/j.physc.2009.11.150",

language = "English",

volume = "470",

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journal = "Physica C: Superconductivity and its Applications",

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TY - JOUR

T1 - Two S-wave gap symmetry for single crystals of the superconductor BaFe 1.8Co0.2As2

AU - Choi, Ki Young

AU - Kim, Soo Hyun

AU - Choi, Changho

AU - Jung, Myung Hwa

AU - Wang, X. F.

AU - Chen, X. H.

AU - Noh, Jae Dong

AU - Lee, Sung Ik

PY - 2010/12

Y1 - 2010/12

N2 - To clarify the gap structure of the iron-pnictide superconductors, we synthesized optimally doped single crystals of BaFe1.8Co 0.2As2, which had a critical temperature, Tc, of 23.6 K. The initial M-H curve was used to find the lower critical field, Hc1. The full range of the temperature dependence of Hc1 was explained by using a two S-wave gap symmetry. We estimate the two gap as Δ1(0) = 1.64 ± 0.2 meV for the small gap and Δ2(0) = 6.20 ± 0.2 meV for the large gap.

AB - To clarify the gap structure of the iron-pnictide superconductors, we synthesized optimally doped single crystals of BaFe1.8Co 0.2As2, which had a critical temperature, Tc, of 23.6 K. The initial M-H curve was used to find the lower critical field, Hc1. The full range of the temperature dependence of Hc1 was explained by using a two S-wave gap symmetry. We estimate the two gap as Δ1(0) = 1.64 ± 0.2 meV for the small gap and Δ2(0) = 6.20 ± 0.2 meV for the large gap.

KW - FeAs

KW - Iron-based superconductor

KW - Lower critical field

KW - S-wave gap

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U2 - 10.1016/j.physc.2009.11.150

DO - 10.1016/j.physc.2009.11.150

M3 - Article

AN - SCOPUS:78649698742

SN - 0921-4534

VL - 470

SP - S506-S507

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - SUPPL.1

ER -

Two S-wave gap symmetry for single crystals of the superconductor BaFe _1.8Co_0.2As₂

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