Masafumi Hanawa

Superconductivity at 1 K in Cd2Re2O7

We report the first pyrochlore oxide superconductor Cd2Re2O7. Resistivity,magnetic susceptibility,and specific heat measurements on single crystals evidence a bulk superconductivity at 1 K. Another phase transition found at 200 K suggests that a peculiar electronic structure lies behind the superconductivity.

Spin-1/2 Kagomé-Like Lattice in Volborthite Cu3V2O7(OH)2·2H2O

A novel cuprate Volborthite, Cu 3 V 2 O 7 (OH) 2 ·2H 2 O, containing an S -1/2 (Cu 2+ spin) kagome -like lattice is studied by magnetic susceptibility, specific heat, and 51 V NMR measurements. Sig...

Systematic Comparison of Eight Substrates in the Growth of FeSe0.5Te0.5 Superconducting Thin Films

We have investigated the crystal structures and superconducting properties of thin films of FeSe0.5Te0.5 grown on eight different substrates. Superconductivity is not correlated with the lattice mismatch; rather it is correlated with the degree of in-plane orientation and with the lattice parameter ratio c/a. The best superconducting properties were observed in films on MgO and LaAlO3 (Tczero of 9.4 K). Transmission electron microscopy observation showed that the presence or absence of an amorphous-like layer at the substrate surface plays a key role in determining the structural and superconducting properties of the grown films.

Epitaxial Growth of FeSe0.5Te0.5 Thin Films on CaF2 Substrates with High Critical Current Density

In-situ epitaxial growth of FeSe

Superconductivity of FeSe0.5Te0.5 Thin Films Grown by Pulsed Laser Deposition

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Structural phase transition in the superconducting pyrochlore oxide Cd2Re2O7

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Superconductivity and magnetic fluctuations in Cd(2))Re(2)O(7) via Cd nuclear magnetic resonance and re nuclear quadrupole resonance.

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Hall effect in superconducting Fe(Se0.5Te0.5) thin films

thin films is demonstrated on a non-oxide substrate CaF

Enhancement of the superconducting transition temperature in FeSe epitaxial thin films by anisotropic compression

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Microscopic analysis of the chemical reaction between Fe(Te, Se) thin films and underlying CaF2

. Structural analysis reveals that compressive stress is moderately added to 36-nm thick FeSe