Ground state of the geometrically frustrated system Y(Sc)Mn2 studied by muon spin relaxation
Abstract
We performed positive muon spin relaxation measurements of the geometrically frustrated system Y0.97Sc0.03(Mn1-xAlx)2. A spin freezing with a static magnetic field of 0.05 T was found at 2.5 K in the x=0 compound while the x=0.1 compound freezes at 45 K with the internal field of 0.17 T. In the x=0.02 compound, the relaxation rate shows a marked thermal hysteresis; the maximum rates occur at 10 K on cooling and at 20 K on heating, whereas the sudden changes in the initial asymmetries occur at 40 K in both processes. The results for the x=0 compound are interpreted as a freezing of minority paramagnetic Mn moments induced by imperfections such as Sc and/or muon charge while majority Mn moments form singlet tetrahedra.
- Publication:
-
Physical Review B
- Pub Date:
- February 2000
- DOI:
- 10.1103/PhysRevB.61.4088
- Bibcode:
- 2000PhRvB..61.4088M
- Keywords:
-
- 75.40.Cx;
- 75.40.Gb;
- 76.75.+i;
- Static properties;
- Dynamic properties;
- Muon spin rotation and relaxation