Magnetic properties of spin-density-wave system with magnetic impurities (TMTSF)(2)(AsF6)(1-x)(FeCl4)(x)

摘要

Magnetization and electron-spin-resonance measurements were carried out on (TMTSF)(2)(AsF6)(1-x)(FeCl4)(x) which is a spin-density-wave (SDW) system with magnetic impurities. The anisotropic g-value and the comparison of Fe concentration with the Curie constant indicate that Fe3+ ions are in a low-spin state (S = 1/2). We also found that the magnetization curve of this compound shows an anomalous behavior; it becomes nonlinear at low fields (B/T approximate to 0.2 T/K) and tends to saturate at high fields. This behavior can be explained if one assumes a field-dependent magnetic interaction between the spins of Fe3+ and the SDW moment. We think that the origin of this phenomenon is the field dependence of the SDW pinning potential, (C) 2000 Elsevier Science B.V. All rights reserved. [References: 4]