Universal relation between superconductivity and antiferromagnetic fluctuations in iron-based superconductor BaFe 2  (As 1- x P x ) 2 

The iron-based superconductor BaFe 2 As 2 suppresses antiferromagnetism by various dopings and pressures and develops superconductivity. We applied pressure to BaFe 2 (As 1- x P x ) 2 with part of As replaced by equivalent P and searched for the essential parameters that govern the superconducting transition temperature by changing two parameters, the P substitution amount and the pressure. As shown in the figure, the superconducting transition temperature at various […]

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Spin triplet superconductivity of UCoGe in the paramagnetic region under pressure.

UCoGe is a unique substance that exhibits a superconducting transition inside ferromagnetism. Based on our group’s previous studies, it is considered that large spin fluctuations in the c- axis direction (states close to the ferromagnetic transition) are essential for the development of superconductivity in this system. Since it has a close relationship with ferromagnetism, it has been expected that in […]

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Half-integer quantum fluxoid state in Sr2RuO4 microrings

The ruthenium oxide superconductor Sr2RuO4 is considered to be in the spin triplet equal spin state from nuclear magnetic resonance (NMR) experiments. It is known that fluxoids are quantized in units of magnetic flux quantum Φ0 in superconductors, but in such superconducting states, wavefunctions also have spin degrees of freedom compared to orbital degrees of freedom, so flaxoids There Fai 0 will be […]

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