NDLI: Magnetic Field Dependence of Specific Heat in KFe$_{2}$As$

Content Provider	Springer Nature Link
Author	Purohit, G. Nayak, P.
Copyright Year	2016
Abstract	The observed change in specific heat by the application of a magnetic field for high-quality superconducting KFe$_{2}$As$_{2}$ single crystals by Abdel-Hafiez et al. (Phys. Rev. B 85, 134533–134543 (2012)) is examined through the phenomenological Ginzburg–Landau (GL) theory of anisotropic type II superconductors. In doing so, it is proposed that the system contains two gaps along two perpendicular directions, i.e., parallel to the ab plane and parallel to the c-axis as per the prediction through an angle-resolved photoemission spectroscopy (ARPES) experiment by Terashima et al. (J. Phys. Soc. Jpn. 78(8), 083701–083704 (2009)) and a de Haas-van Alphen (dHvA) experiment by Sato et al (Phys. Rev. Lett. 103, 047002–047006 (2009)). The single equation for the change of specific heat (ΔC) derived from the GL theory used to study the anisotropic property of cuprate superconductors by Pattanaik et al. (Physica B 405, 3234–3238 (2010)) is now approximately splitted into two equations along these perpendicular directions. The analysis of this equation explains satisfactorily the specific heat anomaly near T $_{c}$ and determines the penetration depth anisotropic ratio γ as 4.98, which is close to the experimental value 5.0 near T $_{c}$ by Abdel-Hafiez et al. (Phys. Rev. B 85, 134533–134543 (2012)) and the calculated value 4.0 by Eskildsen et al. (Rep. Prog. Phys. 74, 124504–1245016 (2011)).
Starting Page	1279
Ending Page	1286
Page Count	8
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	29
Issue Number	5
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2016-01-29
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Iron pnictide superconductor KFe$_{2}$As$_{2}$ single crystal Thermodynamic properties Phenomenological GL theory Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials Condensed Matter Physics Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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