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Two-band and pauli-limiting effects on the upper critical field of 112-type iron pnictide superconductors

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ABSTRACT

The temperature dependence of upper critical field μ0Hc2 of Ca0.83La0.17FeAs2 and Ca0.8La0.2Fe0.98Co0.02As2 single crystals are investigated by measuring the resistivity for the inter-plane (H//c) and in-plane (H//ab) directions in magnetic fields up to 60 T. It is found that μ0Hc2(T) of both crystals for H//c presents a sublinear temperature dependence with decreasing temperature, whereas the curve of μ0Hc2(T) for H//ab has a convex curvature and gradually tends to saturate at low temperatures. μ0Hc2(T) in both crystals deviates from the conventional Werthamer-Helfand-Hohenberg (WHH) theoretical model without considering spin paramagnetic effect for H//c and H//ab directions. Detailed analyses show that the behavior of μ0Hc2(T) in 112-type Iron-based superconductors (IBSs) is similar to that of most IBSs. Two-band model is required to fully reproduce the behavior of μ0Hc2(T) for H//c, while the effect of spin paramagnetic effect is responsible for the behavior of μ0Hc2(T) for H//ab.

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Magnetic field dependence of in-plane resistivity ρ(H) of Ca0.83La0.17FeAs2 for (a) H//ab and (b) H//c, and of Ca0.8La0.2Fe0.98Co0.02As2 for (c) H//ab and (d) H//c measured at fixed temperatures in pulsed fields up to 60 T.
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f3: Magnetic field dependence of in-plane resistivity ρ(H) of Ca0.83La0.17FeAs2 for (a) H//ab and (b) H//c, and of Ca0.8La0.2Fe0.98Co0.02As2 for (c) H//ab and (d) H//c measured at fixed temperatures in pulsed fields up to 60 T.

Mentions: The magnetic field dependence of resistivity ρ(H) of Ca0.83La0.17FeAs2 and Ca0.8La0.2Fe0.98Co0.02As2 single crystals for H//ab and H//c are presented in Fig. 3. Since there is no hysteresis for ρ(H) under μ0H sweep up and down processes, only data collected during the down sweep of the magnet are shown. Obviously, the superconducting transitions are suppressed upon increasing magnetic field for both directions. In addition, the superconductivity of Ca0.8La0.2Fe0.98Co0.02 is more robust against magnetic field compared with Ca0.83La0.17FeAs2, indicating Ca0.8La0.2Fe0.98Co0.02As2 has a higher μ0Hc2(0) than Ca0.83La0.17FeAs2.


Two-band and pauli-limiting effects on the upper critical field of 112-type iron pnictide superconductors
Magnetic field dependence of in-plane resistivity ρ(H) of Ca0.83La0.17FeAs2 for (a) H//ab and (b) H//c, and of Ca0.8La0.2Fe0.98Co0.02As2 for (c) H//ab and (d) H//c measured at fixed temperatures in pulsed fields up to 60 T.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382916&req=5

f3: Magnetic field dependence of in-plane resistivity ρ(H) of Ca0.83La0.17FeAs2 for (a) H//ab and (b) H//c, and of Ca0.8La0.2Fe0.98Co0.02As2 for (c) H//ab and (d) H//c measured at fixed temperatures in pulsed fields up to 60 T.
Mentions: The magnetic field dependence of resistivity ρ(H) of Ca0.83La0.17FeAs2 and Ca0.8La0.2Fe0.98Co0.02As2 single crystals for H//ab and H//c are presented in Fig. 3. Since there is no hysteresis for ρ(H) under μ0H sweep up and down processes, only data collected during the down sweep of the magnet are shown. Obviously, the superconducting transitions are suppressed upon increasing magnetic field for both directions. In addition, the superconductivity of Ca0.8La0.2Fe0.98Co0.02 is more robust against magnetic field compared with Ca0.83La0.17FeAs2, indicating Ca0.8La0.2Fe0.98Co0.02As2 has a higher μ0Hc2(0) than Ca0.83La0.17FeAs2.

View Article: PubMed Central - PubMed

ABSTRACT

The temperature dependence of upper critical field μ0Hc2 of Ca0.83La0.17FeAs2 and Ca0.8La0.2Fe0.98Co0.02As2 single crystals are investigated by measuring the resistivity for the inter-plane (H//c) and in-plane (H//ab) directions in magnetic fields up to 60 T. It is found that μ0Hc2(T) of both crystals for H//c presents a sublinear temperature dependence with decreasing temperature, whereas the curve of μ0Hc2(T) for H//ab has a convex curvature and gradually tends to saturate at low temperatures. μ0Hc2(T) in both crystals deviates from the conventional Werthamer-Helfand-Hohenberg (WHH) theoretical model without considering spin paramagnetic effect for H//c and H//ab directions. Detailed analyses show that the behavior of μ0Hc2(T) in 112-type Iron-based superconductors (IBSs) is similar to that of most IBSs. Two-band model is required to fully reproduce the behavior of μ0Hc2(T) for H//c, while the effect of spin paramagnetic effect is responsible for the behavior of μ0Hc2(T) for H//ab.

No MeSH data available.


Related in: MedlinePlus