Variation of the superconducting order parameters in quasi-one-dimensional superconductors revealed by field-angle-resolved calorimetory under pressure

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The purpose of this research project is to extract interesting properties of superconductors from thermodynamic measurements and from pressure experiments. In particular, by using sensitive calorimeters that we ourselves developed, we tried to discover phenomena that could not be resolved in previous studies.The most important achievement of this project is the result of the magnetocaloric effect measurements of the spin-triplet superconductor Sr2RuO4. We found that at low temperatures the superconducting-normal state transition is of first order when the magnetic field is exactly parallel to the crystalline ab plane. This fact indicates that the superconductivity in this material is destroyed by unknown mechanism. In addition, we revealed the superconducting gap structure of the organic superconductor (TMTSF)2ClO4 from specific heat measurements. We furthermore investigated uniaxial strain effects on ruthenium oxides.