Synchrotron-radiation-based Mössbauer spectroscopy of 40K in antiferromagnetic potassium nanoclusters in sodalite
Abstract
Synchrotron-radiation-based Mössbauer absorption spectroscopy of 40K nuclei was performed. We investigated potassium nanoclusters arrayed in a porous crystal of sodalite. The nanoclusters exhibit antiferromagnetic (AFM) ordering below ≃72 K. The energy-domain 40K Mössbauer spectra were successfully obtained in the temperature range of 8-140 K. Precise analysis of the spectra indicates the appearance of a hyperfine magnetic field at low temperatures. The hyperfine field was evaluated to be 9.2 ±3.0 T at 8 K. This result signifies the spontaneous polarization of s-electron spins in three-dimensionally arrayed potassium nanoclusters in AFM-ordered states.
- Publication:
-
Physical Review B
- Pub Date:
- April 2015
- DOI:
- 10.1103/PhysRevB.91.140101
- Bibcode:
- 2015PhRvB..91n0101N
- Keywords:
-
- 76.80.+y;
- 71.20.Dg;
- 75.50.Ee;
- 82.75.Vx;
- Mossbauer effect;
- other gamma-ray spectroscopy;
- Alkali and alkaline earth metals;
- Antiferromagnetics;
- Clusters in zeolites