Behaviour of muonium in synthetic diamond

TL;DR

This study investigates muonium behavior in synthetic diamond, revealing state probabilities, polarization fractions, and relaxation rates, and compares these properties with natural diamonds to understand material differences.

Contribution

It provides detailed measurements of muonium states and spin relaxation in synthetic diamonds, highlighting differences from natural diamond properties.

Findings

Muon state probabilities vary with diamond type and temperature.

Polarization fractions are lower in synthetic diamonds compared to natural ones.

Spin relaxation rates are similar across synthetic and natural diamond samples.

Abstract

The probabilities of finding the muon in various states in synthetic single crystal and polycrystalline diamond were studied. In the IIa-type single-crystal sample at 150 K the contributions of the diamagnetic muon, `normal', and `anomalous' muonium were observed to be 1.5 %, 57 % and 8.1 %, respectively. The missing fraction of muon polarization was 33.4 %, which is approximately two times smaller than in the Ia-type natural diamond, and two or three times greater than in the IIa- and IIb-type natural diamonds. The muon spin relaxation rates at the `normal' and `anomalous' muonium states in the synthetic and natural samples of IIa- and IIb-type are similar.