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

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