14th CEMS Colloquium


Dr. Fumitaka Kagawa (Unit Leader, Dynamic Emergent Phenomena Research Unit, RIKEN CEMS)


17:30 - 18:30, February 5, 2014 (Wednesday)


Okochi-Hall, RIKEN


Emergent phenomena from mesoscopic inhomogeneity


Crystalline states are comprised of a periodic arrangement of atoms or molecules, and therefore the emergent electronic/magnetic phases are reasonably expected to be spatially homogeneous. However, crystal imperfections that inevitably exist in real materials often result in mesoscopic inhomogeneities, such as multidomain states and/or electronic inhomogeneities. Such inhomogeneities potentially host additional emergent phenomena that are absent from homogeneous systems, thereby raising a possibility for a new arena of fundamental science and applications. In this colloquium, I will address several emergent phenomena from mesoscopic inhomogeneities, such as (i) giant magnetocapacitance effect arising from multiferroic domain walls, (ii) charge-cluster glass in an organic conductor with triangular lattice, (iii) polarization switching ability dependent on multidomain topology in a uniaxial organic ferroelectric.