Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors

Abstract Detailed measurements of the in-plane resistivity were performed in a high-quality Ba( $$\hbox {Fe}_{1-x}\hbox {Co}_{{x}}$$ Fe 1 - x Co x ) $$_2\hbox {As}_2$$ 2 As 2 ( $$x=0.065$$ x = 0.065 ) single crystal, in magnetic fields up to 9 T and with different orientations $$\theta$$ θ relative...

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Autores principales:	I. F. Llovo, C. Carballeira, D. Sóñora, A. Pereiro, J. J. Ponte, S. Salem-Sugui, A. S. Sefat, J. Mosqueira
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/981014244ee640b1b190db358b492d3c
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spelling	oai:doaj.org-article:981014244ee640b1b190db358b492d3c2021-12-02T17:51:13ZMultiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors10.1038/s41598-021-90858-42045-2322https://doaj.org/article/981014244ee640b1b190db358b492d3c2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90858-4https://doaj.org/toc/2045-2322Abstract Detailed measurements of the in-plane resistivity were performed in a high-quality Ba( $$\hbox {Fe}_{1-x}\hbox {Co}_{{x}}$$ Fe 1 - x Co x ) $$_2\hbox {As}_2$$ 2 As 2 ( $$x=0.065$$ x = 0.065 ) single crystal, in magnetic fields up to 9 T and with different orientations $$\theta$$ θ relative to the crystal c axis. A significant $$\rho (T)_{H,\theta }$$ ρ ( T ) H , θ rounding is observed just above the superconducting critical temperature $$T_c$$ T c due to Cooper pairs created by superconducting fluctuations. These data are analyzed in terms of a generalization of the Aslamazov-Larkin approach, that extends its applicability to high reduced-temperatures and magnetic fields. This method allows us to carry out a criterion-independent determination of the angular dependence of the upper critical field, $$H_{c2}(\theta )$$ H c 2 ( θ ) . In spite of the relatively small anisotropy of this compound, it is found that $$H_{c2}(\theta )$$ H c 2 ( θ ) presents a significant deviation from the single-band 3D anisotropic Ginzburg-Landau (3D-aGL) approach, particularly for large $$\theta$$ θ (typically above $$\sim 60^o$$ ∼ 60 o ). These results are interpreted in terms of the multiband nature of these materials, in contrast with other proposals for similar $$H_{c2}(\theta )$$ H c 2 ( θ ) anomalies. Our results are also consistent with an effective anisotropy factor almost temperature independent near $$T_c$$ T c , a result that differs from the ones obtained by using a single-band model.I. F. LlovoC. CarballeiraD. SóñoraA. PereiroJ. J. PonteS. Salem-SuguiA. S. SefatJ. MosqueiraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q I. F. Llovo C. Carballeira D. Sóñora A. Pereiro J. J. Ponte S. Salem-Sugui A. S. Sefat J. Mosqueira Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
description	Abstract Detailed measurements of the in-plane resistivity were performed in a high-quality Ba( $$\hbox {Fe}_{1-x}\hbox {Co}_{{x}}$$ Fe 1 - x Co x ) $$_2\hbox {As}_2$$ 2 As 2 ( $$x=0.065$$ x = 0.065 ) single crystal, in magnetic fields up to 9 T and with different orientations $$\theta$$ θ relative to the crystal c axis. A significant $$\rho (T)_{H,\theta }$$ ρ ( T ) H , θ rounding is observed just above the superconducting critical temperature $$T_c$$ T c due to Cooper pairs created by superconducting fluctuations. These data are analyzed in terms of a generalization of the Aslamazov-Larkin approach, that extends its applicability to high reduced-temperatures and magnetic fields. This method allows us to carry out a criterion-independent determination of the angular dependence of the upper critical field, $$H_{c2}(\theta )$$ H c 2 ( θ ) . In spite of the relatively small anisotropy of this compound, it is found that $$H_{c2}(\theta )$$ H c 2 ( θ ) presents a significant deviation from the single-band 3D anisotropic Ginzburg-Landau (3D-aGL) approach, particularly for large $$\theta$$ θ (typically above $$\sim 60^o$$ ∼ 60 o ). These results are interpreted in terms of the multiband nature of these materials, in contrast with other proposals for similar $$H_{c2}(\theta )$$ H c 2 ( θ ) anomalies. Our results are also consistent with an effective anisotropy factor almost temperature independent near $$T_c$$ T c , a result that differs from the ones obtained by using a single-band model.
format	article
author	I. F. Llovo C. Carballeira D. Sóñora A. Pereiro J. J. Ponte S. Salem-Sugui A. S. Sefat J. Mosqueira
author_facet	I. F. Llovo C. Carballeira D. Sóñora A. Pereiro J. J. Ponte S. Salem-Sugui A. S. Sefat J. Mosqueira
author_sort	I. F. Llovo
title	Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
title_short	Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
title_full	Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
title_fullStr	Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
title_full_unstemmed	Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
title_sort	multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/981014244ee640b1b190db358b492d3c
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Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors

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