Abstract
The effect of hydrostatic pressure on the magnetic and electronic properties has been investigated for prototypical double-exchange ferromagnets, , with varying nominal hole concentration x (0.15≤x≤0.5). A pressure-enhanced transfer interaction is observed to stabilize the ferromagnetic metallic phase, i.e., increase the Curie temperature , over the whole concentration range investigated. The pressure coefficient of is found to be significantly x dependent and steeply decreases from d ln/dP≊+0.065 at x=0.15 to a small value (≊+0.005 ) at x=0.4–0.5. This suggests a symptomatic change of the electronic nature from the strong- to weak-coupling region with increasing the hole-doping level.
- Received 22 February 1995
DOI:https://doi.org/10.1103/PhysRevB.51.16491
©1995 American Physical Society