Vortex fluctuation effect evaluated using reversible magnetization in optimally doped single crystal NaFe0.97Co0.03As superconductor

D. Ahmad; B. H. Min; W. J. Choi; S. Salem-Sugui; J. Mosqueira; Yong Seung Kwon

doi:10.1088/0953-2048/27/12/125006

Vortex fluctuation effect evaluated using reversible magnetization in optimally doped single crystal NaFe_0.97Co_0.03As superconductor

D. Ahmad, B. H. Min, W. J. Choi, S. Salem-Sugui, J. Mosqueira, Yong Seung Kwon

Department of Physics and Chemistry

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

5 Scopus citations

Abstract

The reversible magnetization curves for various magnetic fields are investigated for a single crystal of the optimally doped NaFe_0.97Co_0.03As superconductor with the superconducting transition temperature T_c=20.9 K (ρ(T)=0) in the case where H is parallel to c-axis. A well-formed rounding effect is observed in the temperature dependence of the magnetization, and it widens on increasing the strength of the applied magnetic fields. At 20.2 K, we observe a crossing of the M(T) curves for different applied magnetic fields, indicating important fluctuation effects. The irreversibility line H_irr(T) obeys a universal scaling relation H_irr(T)=H₀(1-T/T_c)ⁿcharacterized by n∼1.537, which confirms the moderately anisotropic nature of the sample. The scaling analysis of the reversible magnetization in the region near T_c(H) supports the three-dimensional nature of the vortex fluctuations in NaFe_0.97Co_0.03As.

Original language	English
Article number	125006
Journal	Superconductor Science and Technology
Volume	27
Issue number	12
DOIs	https://doi.org/10.1088/0953-2048/27/12/125006
State	Published - 1 Dec 2014

Bibliographical note

Publisher Copyright:
© 2014 IOP Publishing Ltd.

Keywords

fluctuation effects
iron-based superconductor
magnetic properties

Access to Document

10.1088/0953-2048/27/12/125006

Cite this

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title = "Vortex fluctuation effect evaluated using reversible magnetization in optimally doped single crystal NaFe0.97Co0.03As superconductor",

abstract = "The reversible magnetization curves for various magnetic fields are investigated for a single crystal of the optimally doped NaFe0.97Co0.03As superconductor with the superconducting transition temperature Tc=20.9 K (ρ(T)=0) in the case where H is parallel to c-axis. A well-formed rounding effect is observed in the temperature dependence of the magnetization, and it widens on increasing the strength of the applied magnetic fields. At 20.2 K, we observe a crossing of the M(T) curves for different applied magnetic fields, indicating important fluctuation effects. The irreversibility line Hirr(T) obeys a universal scaling relation Hirr(T)=H0(1-T/Tc)ncharacterized by n∼1.537, which confirms the moderately anisotropic nature of the sample. The scaling analysis of the reversible magnetization in the region near Tc(H) supports the three-dimensional nature of the vortex fluctuations in NaFe0.97Co0.03As.",

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author = "D. Ahmad and Min, {B. H.} and Choi, {W. J.} and S. Salem-Sugui and J. Mosqueira and Kwon, {Yong Seung}",

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AU - Ahmad, D.

AU - Min, B. H.

AU - Choi, W. J.

AU - Salem-Sugui, S.

AU - Mosqueira, J.

AU - Kwon, Yong Seung

PY - 2014/12/1

Y1 - 2014/12/1

N2 - The reversible magnetization curves for various magnetic fields are investigated for a single crystal of the optimally doped NaFe0.97Co0.03As superconductor with the superconducting transition temperature Tc=20.9 K (ρ(T)=0) in the case where H is parallel to c-axis. A well-formed rounding effect is observed in the temperature dependence of the magnetization, and it widens on increasing the strength of the applied magnetic fields. At 20.2 K, we observe a crossing of the M(T) curves for different applied magnetic fields, indicating important fluctuation effects. The irreversibility line Hirr(T) obeys a universal scaling relation Hirr(T)=H0(1-T/Tc)ncharacterized by n∼1.537, which confirms the moderately anisotropic nature of the sample. The scaling analysis of the reversible magnetization in the region near Tc(H) supports the three-dimensional nature of the vortex fluctuations in NaFe0.97Co0.03As.

AB - The reversible magnetization curves for various magnetic fields are investigated for a single crystal of the optimally doped NaFe0.97Co0.03As superconductor with the superconducting transition temperature Tc=20.9 K (ρ(T)=0) in the case where H is parallel to c-axis. A well-formed rounding effect is observed in the temperature dependence of the magnetization, and it widens on increasing the strength of the applied magnetic fields. At 20.2 K, we observe a crossing of the M(T) curves for different applied magnetic fields, indicating important fluctuation effects. The irreversibility line Hirr(T) obeys a universal scaling relation Hirr(T)=H0(1-T/Tc)ncharacterized by n∼1.537, which confirms the moderately anisotropic nature of the sample. The scaling analysis of the reversible magnetization in the region near Tc(H) supports the three-dimensional nature of the vortex fluctuations in NaFe0.97Co0.03As.

KW - fluctuation effects

KW - iron-based superconductor

KW - magnetic properties

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