Multiband behavior and non-metallic low-temperature state of K$_{0.50}$Na$_{0.24}$Fe$_{1.52}$Se$_{2}$

We report evidence for multiband transport and an insulating low-temperature normal state in superconducting K $_{0.50}$ Na $_{0.24}$ Fe $_{1.52}$ Se $_{2}$ with $T_{c} \approx 20$ K. The temperature-dependent upper critical field, $H_{c 2}$ , is well described by a two-band BCS model. The normal-state resistance, accessible at low temperatures only in pulsed magnetic fields, shows an insulating logarithmic temperature dependence as $T \to 0$ after superconductivity is suppressed. This is similar as for high- $T_{c}$ copper oxides and granular type-I superconductors, suggesting that the superconductor-insulator transition observed in high magnetic fields is related to intrinsic nanoscale phase separation.

Multiband behavior and non-metallic low-temperature state of K $_{0.50}$ Na $_{0.24}$ Fe $_{1.52}$ Se $_{2}$

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Multiband behavior and non-metallic low-temperature state of K $_{0.50}$ Na $_{0.24}$ Fe $_{1.52}$ Se $_{2}$

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Multiband behavior and non-metallic low-temperature state of K0.500.50​Na0.240.24​Fe1.521.52​Se22​

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Multiband behavior and non-metallic low-temperature state of K0.500.50​Na0.240.24​Fe1.521.52​Se22​

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Multiband behavior and non-metallic low-temperature state of K $_{0.50}$ Na $_{0.24}$ Fe $_{1.52}$ Se $_{2}$

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Multiband behavior and non-metallic low-temperature state of K $_{0.50}$ Na $_{0.24}$ Fe $_{1.52}$ Se $_{2}$

讲解博客

AI智能校验