Development of transient μSR method for high-flux pulsed muons

In order to expand the applicability of muon spin rotation, relaxation, and resonance (μSR) experiments with pulsed muons and to make effective use of the high-flux beam, we have developed a new experimental method “transient μSR”. In this method, μSR data for each muon pulse are tagged with external parameters such as temperature and magnetic field in real time, allowing the sample environment to be changed without interrupting data collection. As a result, continuous μSR measurements under sample conditions that vary on a time scale longer than the beam pulse interval (40 ms) are realized, and efficient beam utilization is achieved by eliminating the lag time associated with moving between discrete measurement points. The transient μSR method was applied to the study of the magnetic properties of cupric oxide (CuO) and the observation of level-crossing resonance relaxation in copper, and the method was successfully established by confirming that the results reproduce those in the previous reports.