科研之友
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摘要
Negative differential resistance (NDR) was observed in the most well known organic conductor, TTF-TCNQ, in its low-temperature Peierls insulator phase below 53 K. The voltage-current (V -I) characteristics below this temperature, measured by a four-probe method, exhibited unique NDR behavior, in which the dV/dI versus conductivity (sigma) plots had the inflection points at the three sigma values without depending on temperature. These sigma values were found to coincide with the conductivities at the three transition temperatures (53, 49, and 38 K) for the formation of the charge-density waves in TTF-TCNQ. This suggests that the electronic structure of the Peierls insulating phase of TTF-TCNQ is governed by the total carrier density, which is determined by not only thermal excitation but also carrier injection.
- 出版日期2017-7-14
