We present preliminary data on the low temperature magnetoresistance of (TMTSF)2AsF6, investigated in a high magnetic field of 37T at liquid helium temperature in the ambient pressure spin density wave state of the compound. Starting around 15T a single series of fast oscillations periodic in 1/B is visible with a hndamental frequency very close to 200T. The AsF6 salt is believed to have physical properties very similar to those of PF6. However this fiequency is substantially lower than the 230T measured in PF6. More detailed experiments concerning the angular and temperature dependence of both oscillatory and background magnetoresistance are in progress.The static magnetization in the superconducting phase of mTSF)$lO, is measured over the temperature range from 0.7K to 4.2K at a cooling rate through the CIO; anion ordering temperature (-24K) from 0.3Wmin to 37Wmin. With increasing cooling rate, the temperature of superconducting transition continuously decreases from 1.2K at a cooling rate of 0.3Wmin to 0.9K at one of 12Wmin. In the rapid cooling case (37Wmin), the superconducting phase is not observed above 0.7K. In the same ccloling rate region (-3OK/min), the SDW transition is observed by 'H-NMR measurements around 4K. The results are discussed in connection with theories of randomness which is caused by the imperfectncs of anion ordering and competition with the SDW phase.
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