Negative muon spin rotation and relaxation on Li metal

• Published in: Journal of physics. Conference series 2023-03, Vol.2462 (1), p.12045
• Main Authors: Sugiyama, Jun, Umegaki, Izumi, Takeshita, Soshi, Nakano, Takehito, Ninomiya, Kazuhiko, Shimomura, Koichiro, Kenya Kubo, M.
• Format: Article
• Language: English
• Subjects: Lithium-ion batteries; Muon spin relaxation; Muon spin rotation; Physics; Polarization (spin alignment); Rechargeable batteries
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2462/1/012045

In order to study the effect of muonic-Li on the µ − SR spectrum for Li battery materials, the transverse field (TF) µ − SR spectra have been measured for natural Li metal and 6 Li metal samples in the temperature range between 5 and 300 K. Here, TF denotes the magnetic field perpendicular to the initial µ − spin polarization. For both samples, the TF- µ − SR spectrum showed a clear oscillation without relaxation down to the lowest temperature measured: i.e., about 5 K. This clearly excludes the scenario that the muonic-Li starts to diffuse at a certain temperature between 5 and 300 K. Although the mechanism on such a zero TF relaxation rate is not fully understood, we could ignore the contribution from the muonic Li on the asymmetry spectrum for the Li-ion battery materials at temperatures above 5 K.