Coexistence of type-I and type-II superconductivity signatures in ZrB12 probed by muon spin rotation measurements

Abstract

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Anisotropic superconductivity in ZrB$_{12}$ near critical Bogomolnyi point

“…Compared to other superconductors we have studied earlier, it was surprisingly easy to find a contact in such spectroscopic regime for ZrB 12 . The possible reasons can be the large coherence length(s) [29,47], an unusually high T c compared to other dodecaborides, and the high purity of the single crystal we have used of ZrB 12 . As mentioned earlier, the extended flat DOS neighbourhood of the Fermi level [41] for this material can be another possible reason behind such stability.…”

“…Based on some recent experimental findings, ZrB 12 is believed to be one example of such IT superconductors [26][27][28][29]. However, the above description of inter-type superconductivity is valid for isotropic superconductors.…”

“…The paramagnetic Meissner effect study [28] further reported that vortex clusters mediate the expulsion and penetration of flux at low temperatures. Recently, muon spin rotation measurements [29] performed on ZrB 12 revealed that the type-I and type-II behaviours coexist within a finite temperature range simultaneously.…”

Tracing Vortex Clustering in a Superconductor by the Magnetic Flux Distribution

“…The MSRE cannot resolve vortex positions inside a superconductor yielding instead a histogram of the magnetic flux distribution. 37 Seemingly, MSRE provides much less detailed information on the vortex configurations. Nevertheless, the measurements of superconductive ZrB 12 revealed notable deviations from what is expected for conventional type I/II superconductors.…”

“…Nevertheless, the measurements of superconductive ZrB 12 revealed notable deviations from what is expected for conventional type I/II superconductors. 37 These were interpreted as a signature of the vortex-free Meissner phase presence. In single-band superconductors, it is regarded as a hallmark of the IMS.…”