Study of magnetism of strongly correlated organic system by muon spin rotation and relaxation under high pressure

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High-pressure muon spin rotation and relaxation experiments were carried out for antiferromagnetic organic insulator β'-(BEDT-TTF)_2ICl_2, which shows superconducting transition under high pressure, and found the muon precession signal under high pressure for organic conductor for the first time. Temperature and pressure dependence of precession frequency and precession amplitude suggest the existence of pressure-induced phase transition around 0.7GPa. We also carried out zero-field muon spin relaxation experiment for organic superconductor κ-(BEDT-TTF)_4Hg_<2.89>Br_8 and found that internal field is constant around the superconducting transition temperature.