In order to elucidate the nature of the exotic ordered phase of NpO2 below T0=26K, we have initiated the first 17O-NMR measurements. From the temperature dependence of the 17O-NMR spectrum, the occurrence of two inequivalent oxygen sites has been confirmed below T0. This finding verifies the lowering of symmetry in the ordered state of NpO2.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering