Development of Transient $\mu$SR Method for High-Flux Pulsed Muons

TL;DR

The paper introduces a novel transient $$SR method enabling continuous, real-time data collection under varying sample conditions using high-flux pulsed muons, improving efficiency and applicability.

Contribution

A new transient $$SR technique was developed to allow real-time tagging of data with environmental parameters, facilitating continuous measurements without interruption.

Findings

Successfully applied to CuO magnetic properties

Observed level-crossing resonance relaxation in copper

Confirmed results match previous reports

Abstract

In order to expand the applicability of muon spin rotation, relaxation, and resonance ($\mu$SR) experiments with pulsed muons and to make effective use of the high-flux beam, we have developed a new experimental method ``transient $\mu$SR''. In this method, $\mu$SR 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 $\mu$SR 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 $\mu$SR 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.