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

Abstract

Superconductors usually display either type-I or type-II superconductivity and the coexistence of these two types in the same material, for example at different temperatures is rare in nature. We the employed muon spin rotation (muSR) technique to unveil the superconducting phase diagram of the dodecaboride ZrB12 and obtained clear evidence of both type-I and type-II characteristics. Most importantly, we found a region showing unusual behavior where the usually mutually exclusive muSR signatures of type-I and type-II superconductivity coexist. We reproduced that behavior in theoretical modeling that required taking into account multiple bands and multiple coherence lengths, which suggests that material has one coherence length larger and another smaller than the magnetic field penetration length (the type-1.5 regime). At stronger fields, a footprint of the type-II mixed state showing square flux-line lattice was also obtained using neutron diffraction.

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• Magnetic response of nematic superconductors: skyrmion stripes and their signatures in muon spin relaxation experiments
• Anisotropic superconductivity in ZrB${}_{12}$ near critical Bogomolnyi point
• Pinning effects in a two-dimensional cluster glass
• Influence of pressure on properties of multi-gap type-I superconductor BeAu
• Machine-learning Guided Search for Phonon-mediated Superconductivity in Boron and Carbon Compounds
• Microscopic solutions for vortex clustering in two-band type-1.5 superconductors
• Observation of vortex stripes in UTe${}_2$