Pressure dependence of magnetic properties of CrO2 from theory
Langue
en
Article de revue
Ce document a été publié dans
Chemical Physics Letters. 2005, vol. 407, n° 4-6, p. 516-521
Elsevier
Résumé en anglais
From self-consistent electronic structure calculations bulkmodulus of CrO2 (270 GPa) is within agreement of experimental value 280 ± 20 GPa. At different simulated isotropic compressions the system remains half metallic ...Lire la suite >
From self-consistent electronic structure calculations bulkmodulus of CrO2 (270 GPa) is within agreement of experimental value 280 ± 20 GPa. At different simulated isotropic compressions the system remains half metallic for 1 < P < 60 GPa then becomes metallic with lowered magnetization for 60 < P < 120 GPa. This is accompanied by decreasing energy difference between the ferromagnetic ground state and an antiferromagnetic configuration so that both are accessible at high pressures. Spin fluctuation theory analysis points to critical pressure for magnetic order disappearance PC = 150 GPa and dTC/dP = −0.027 K GPa−1. This positions CrO2 between soft (Invar) and very hard (fcc–Ni) magnetic systems pointing to its magnetic hardness.< Réduire
Mots clés en anglais
High pressure
Magnetic properites
CrO2
Chrome oxide
Electronic structure calculation
Origine
Importé de halUnités de recherche