Exploitation of material physics related to the Berry's phase in the charge-spin coupled or decoupled system

2014 Fiscal Year Final Research Report

• Project/Area Number: 24540357
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: IGUCHI Satoshi 東北大学, 金属材料研究所, 准教授 (50431789)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 誘電体 / 強相関電子系 / 有機分子 / 乱れ

Outline of Final Research Achievements

In a material composed of molecular dimer, when electrons shift to either molecule of the dimer, dipole moments appear. In some organic molecular crystals, such a new dielectricity by the positional shift of electrons in molecules is suggested. In order to search for and understand the dielectricity induced by the fluctuations of positional degrees of freedom of the charge in the dimar and molecular, we systematically stdied the dielectricity in molerular compounds, (BEDT-TTF)X and (TTM-TTP)X. We have found that anomalous enhancement of dielectric constant due tothe growth of polar domain, freezing of the domain at low temperatures, and inhomogeneous elecric polarizations in relation to randomness in the crystals.

Free Research Field

物性物理