Abstract
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.
Highlights
It is commonly observed that the highly correlated system has an insulating ground state at low pressure in the temperature-pressure phase diagram
The suppression of spin density wave (SDW) by pressure is understood as a recovery of the Fermi surface by denesting with increasing pressure
Since the scenario of the quantum Hall effect (QHE) is discussed in terms of nesting of 1D Fermi surface for SDW, it is of great interest to see if the field-induced phase scenario holds for charge density wave (CDW)
Summary
It is commonly observed that the highly correlated system has an insulating ground state at low pressure in the temperature-pressure phase diagram. The new type of quantum Hall effect (QHE) [2] is quite different from the conventional QHE seen in GaAlAs. Since the scenario of the QHE is discussed in terms of nesting of 1D Fermi surface for SDW, it is of great interest to see if the field-induced phase scenario holds for CDW. Since the scenario of the QHE is discussed in terms of nesting of 1D Fermi surface for SDW, it is of great interest to see if the field-induced phase scenario holds for CDW For this purpose, we studied the quasi-one-dimensional (Q1D) organic conductor, HMTSF-TCNQ, shown, where HMTSF and TCNQ are the abbreviation of hexamethylenetetraselenafulvalene and tetracyanoquinodimethane, respectively. Field-induced phases are indicated by the clear presence of 1D Fermi surfaces and 2D straw-shaped Fermi surfaces
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