ISSP - The institute for Solid State Physics

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Professor

Osamu
YAMAMURO

Research Associate

Maiko
KOFU

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We are studying chemical physics of complex condensed matters, especially glasses and supercooled liquids, water and related materials, ionic liquids, and single molecule magnets (SMMs). Glass transition is a mysterious phenomenon in which supercooled liquids solidify without structural change. This phenomenon cannot be explained by current physics. Water is the most familiar and important material for humans and also exhibits various unique phenomena derived by hydrogen bonds. Ionic liquids, found recently, exhibit many interesting physical properties originating from the competing electrostatic and van der Waals interactions. SMMs are significant not only for applications such as high-density magnetic-recording media but also for basic physical properties such as quantum effects on magnetization reversal. These substances are investigated from neutron scattering, X-ray diffraction, heat capacity, and dielectric measurements. Our aim is to find simple (?) rules involved in complex systems from the three different points of view, i.e., structure, dynamics, and thermodynamic.

Heat capacity of glassy propene prepared by low-temperature vapor-deposition. A glass transition with a giant heat capacity jump and a boson peak with a pronounced annealing effect appeared.

Inelastic neutron scattering spectra of a rare-earth based molecule magnet. The magnetic excitations at 1.7 meV and 12.3 meV are originated in the Tb-Cu exchange coupling and uniaxial anisotropy of Tb ions, respectively.