J. Phys. Soc. Jpn. 88, 034710 (2019) [6 Pages]

Hysteretic Current–Voltage Characteristics in the Deuterium-Dynamics-Triggered Charge-Ordered Phase of κ-D3(Cat-EDT-TTF)2

+ Affiliations
1The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan2Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8568, Japan3AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Chiba 277-8589, Japan

A purely organic material, κ-D3(Cat-EDT-TTF)2, undergoes a peculiar charge ordering transition triggered by deuterium localization in hydrogen bonds between two-dimensional conducting layers. Here, we report that the current density–electric field characteristics of this charge-ordered phase exhibit negative differential resistance and also hysteresis, which is considered to be induced by the deuterium dynamics. Upon the application of a pulsed voltage, the resistance irreversibly changes; namely, the initial charge-ordered state is changed to a metastable state through a high-conducting (excited) state, which results in the appearance of the hysteresis. Raman spectroscopy suggests that this metastable state is a non-charge-ordered dimer-Mott state. Interestingly, this state does not appear at low temperatures, and instead, the initial charge-ordered state reappears. These results are well understood by considering the temperature-dependent dynamics of hydrogen-bonded deuterium (i.e., localization/fluctuations) coupled to the π-electrons in the conducting layers. In contrast, the hydrogen analogue κ-H3(Cat-EDT-TTF)2, which is a dimer-Mott insulator without proton localization, does not show such hysteretic behavior.

©2019 The Physical Society of Japan


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