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Pressure‐induced sp ferromagnetism in electride‐like elemental potassium from first‐principles (Phys. Status Solidi B 3/2014)
Author(s) -
Dong Shengjie,
Zhao Hui
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201470117
Subject(s) - ferromagnetism , condensed matter physics , magnetism , ionic bonding , fermi surface , atom (system on chip) , fermi level , materials science , phase (matter) , chemistry , electron , ion , physics , superconductivity , embedded system , organic chemistry , quantum mechanics , computer science
From a magnetism standpoint, the alkali metals might be thought of as the least likely elements in which to fi nd bulk ferromagnetism since they are archetypal nearly free‐electron materials in which each atom contributes a single valence electron to a gas whose effective interaction with the ionic cores is weak at ambient conditions. Nevertheless, theoretical studies have predicted that ferromagnetic K‐sc is the most stable phase in the pressure range 20–22 GPa, which forms an electride and exhibits a Stoner‐type sp ferromagnetism. Later work illuminated that the occurrence of both ferromagnetism enhancement and collapse is related to the formation of interstitial electron blobs and the deformation of the Fermi surface. Shengjie Dong and Hui Zhao (pp. 527–532 ) suggest that the geometry‐dependent ferromagnetism is related to the strength of ionicity, the existence of a fl at band, the presence of considerable pseudo‐anions, and the appearance of a spinresolved Fermi surface topological transition. The pressure‐induced electride‐like phase of potassium as a potential new member of the sp magnetic family is not only a model object for investigations on the mechanism of magnetism but also a multifunctional material for possible applications in numerous areas.