In the Temperature-Pressure phase diagram, the quasi-one-dimensional conductor, HMTSF-TCNQ, the ground state at ambient pressure is an insulator of charge density wave (CDW) below 30 K, while it shows a good metallic nature at higher temperature. The CDW insulating state is suppressed by a pressure of 1 GPa, which is considered to be a quantum critical point. Neither at 0 -0.5 nor 2 GPa but only around this critical point in pressure, field-induced phases appear from 0.2 T through 10 T, where Rxy is almost constant and Rxx is very low. These phenomena are achieved when the magnetic field is applied along the least conducting axis. The behaviors are consistent with a kind of Quantum Hall Effect (QHE). The field-induce phase accompanied by the QHE might be the field-induced CDW (FICDW) similar to that of FISDW, observed in (TMTSF)2X salts. This paper presents the latest result of the Hall effects reviewing the history of the authors' work on this material from preliminary to the latest ones.
Chemically modified graphene and its dispersions are promising materials for several applications. The chemically inert characteristics of graphene, however, mean that chemical exfoliation and functionalization require a strong reactant and a long reaction time. To resolve the issues, we describe a novel microwave-assisted graphene modification technique using chloroform, by which chlorinated graphene was exfoliated and dispersed directly in the chloroform after irradiation for 15 min.
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