Double exchange model for magnetic hexaborides

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Pereira, VM (Author) Other; dos Santos, JMBL (Author) FCUP; Castro, EV (Author) FCUP; Castro Neto, AH (Author) Other

Journal

Title: Physical Review Letters

Vol. 93

Pages: 147202-1-147202-4

ISSN: 0031-9007

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 25 Citations

Scopus - 27 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-000-8D5

DOI: 10.1103/physrevlett.93.147202

Abstract (EN): A microscopic theory for rare-earth ferromagnetic hexaborides, such as Eu1-xCaxB6, is proposed on the basis of the double-exchange Hamiltonian. In these systems, the reduced carrier concentrations place the Fermi level near the mobility edge, introduced in the spectral density by the disordered spin background. We show that the transport properties such as the Hall effect, magnetoresistance, frequency dependent conductivity, and dc resistivity can be quantitatively described within the model. We also make specific predictions for the behavior of the Curie temperature T-C as a function of the plasma frequency omega(p).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4