Electronic states and dissipations of vortex core in quantum limit investigated by microwave complex resistivity measurements on pure fese single crystals

Tatsunori Okada, Yoshinori Imai, Atsutaka Maeda, Takahiro Urata, Yoichi Tanabe, Katsumi Tanigaki

Research output: Contribution to journalArticlepeer-review

Abstract

In order to clarify the electronic state and the mechanism of energy dissipations by the motion of the vortex core in the quantum limit, we measured the microwave complex conductivity of pure FeSe single crystals in the zero-field limit and under finite magnetic fields. The temperature dependence of the superfluid density changed as 1 - (T/Tc)1.2, indicating the presence of nodal lines in the superconducting gap. From the magnetic-field dependence of the flux-flow resistivity, we found that a barometer of the electronic state inside the vortex core turned out to be ω0τcore= 1 ± 0.5. This suggests that the vortex core of pure FeSe is still in the moderately clean regime, which is inconsistent with the expectation that the super-clean core is realized in this material. We also found that the mean-free path inside the vortex core is suppressed at the distance of the order of the core radius. Based on the observed results and previous reports, we discussed possible origins of rather small ω0τcorein terms of the multiple-bands nature and additional mechanisms giving extra energy dissipations specific to the vortex core in motion.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2017 Dec 31

ASJC Scopus subject areas

  • General

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