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Superconducting Gap Nodes in the Zone- Centered Hole Bands of \(\text{ KFe}_2\text{ As}_2\)

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Book cover Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements

Part of the book series: Springer Theses ((Springer Theses))

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Abstract

In this chapter, we show the results of the end member of the hole-doped system, \(\text{ KFe}_2 \text{ As}_2\), which has three zone-centered hole pockets and no electron Fermi surface but still exhibits superconductivity. We have performed measurements of the magnetic penetration depth in very clean single crystals of \(\text{ KFe}_2\text{ As}_2\) with residual resistivity ratio \({ RRR} \sim 1200\) by using the tunnel diode oscillator down to 80 mK. A steep temperature dependence of \(\lambda (T)\) at low temperatures indicates the existence of low-energy excitations in \(\text{ KFe}_2\text{ As}_2\), which is totally different from the flat temperature behavior observed in the optimally doped (Ba\(_{1-x}\)K\(_x\))\(\text{ Fe}_2\text{ As}_2\). Our analysis based on the DFT band calculation and dHvA results reveals that this material has well formed line nodes located in the \(\varGamma \)-centered hole bands.

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Notes

  1. 1.

    \(a=3.841\) Å, \(c=13.861\) Å, and \(z =0.3525\).

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Authors and Affiliations

  1. Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan

    Kenichiro Hashimoto

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  1. Kenichiro Hashimoto
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Correspondence to Kenichiro Hashimoto .

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Hashimoto, K. (2013). Superconducting Gap Nodes in the Zone- Centered Hole Bands of \(\text{ KFe}_2\text{ As}_2\) . In: Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54294-0_6

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