Metallic Conduction and Carrier Localization in Two-Dimensional BEDO-TTF Charge-Transfer Solid Crystals

Author:

Ito HiroshiORCID,Matsuno Motoki,Katagiri Seiu,Yoshina Shinji K.,Takenobu Taishi,Ishikawa Manabu,Otsuka AkihiroORCID,Yamochi HidekiORCID,Yoshida Yukihiro,Saito Gunzi,Shen Yongbing,Yamashita Masahiro

Abstract

Charge-transfer salts based on bis(ethylenedioxy)tetrathiafulvalene (BEDO-TTF or BO for short) provide a stable two-dimensional (2D) metallic state, while the electrical resistance often shows an upturn at low temperatures below ~10 K. Such 2D weak carrier localization was first recognized for BO salts in the Langmuir–Blodgett films fabricated with fatty acids; however, it has not been characterized in charge-transfer solid crystals. In this paper, we discuss the carrier localization of two crystalline BO charge-transfer salts with or without magnetic ions at low temperatures through the analysis of the weak negative magnetoresistance. The phase coherence lengths deduced with temperature dependence are largely dominated by the electron–electron scattering mechanism. These results indicate that the resistivity upturn at low temperatures is caused by the 2D weak localization. Disorders causing elastic scattering within the metallic domains, such as those of terminal ethylene groups, should be suppressed to prevent the localization.

Funder

JSPS KAKENHI

Publisher

MDPI AG

Subject

Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Five-membered ring systems: with O and S (Se, Te) atoms;Progress in Heterocyclic Chemistry;2023

2. New Spin on Metal-Insulator Transitions;Crystals;2022-12-30

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