Character of magnetic instabilities in CaFe2As2
G. D. Samolyuk, V. P. Antropov
TL;DR
This paper analyzes magnetic instabilities in CaFe2As2 using density functional susceptibility, revealing different magnetic behaviors in collapsed and ambient phases related to superconductivity and local moments.
Contribution
It provides a comparative analysis of magnetic susceptibilities in CaFe2As2 and pure d-metals, highlighting conditions for itinerant and local moment states.
Findings
Collapsed phase exhibits itinerant behavior with magnetic frustration.
Ambient phase stabilizes local magnetic moments with less frustration.
Magnetic order varies with phase and wave vector.
Abstract
The density functional non-interacting susceptibility has been analyzed in different phases of CaFe2As2 and compared with similar data for pure d-metals. The conditions for the "no local moment" itinerant state with large frustrations are found for the "collapsed" phase (corresponding to superconducting phase). This itineracy determines the instability versus the incommensurate magnetic order for the narrow region of wave vectors. For the ambient pressure phase, the local moments on Fe atoms with much less frustrated antiferromagnetic interactions are stabilized and a magnetic short or long range order for all wave vectors is developed.
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