Magnetic susceptibility of the one-dimensional electron gas; application to BDP(TCNQ)2

The magnetic susceptibility of the noninteracting electron gas has been studied on the basis of free electrons and the tight-binding model, with application to the properties of organic conducting materials. Theoretical curves of susceptibility versus temperature are presented. The gradual transition from low temperature Pauli paramagnetism to the high temperature Curie law region is shown. In the transition region, the one-dimensional systems show a peak in the susceptibility of the order of 110% of the low temperature limit. The magnetic susceptibility of the compound BDP(TCNQ)2 is interpreted in terms of a one-dimensional tight-binding model with an energy bandwidth of 0.07 eV.