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- W2318089932 abstract "We present results of experiments and ab initio calculations focused on the stability of Co magnetism in ${mathrm{ErCo}}_{2}$ exerted to high pressures. In the experiments we have studied pressure effects on electrical-resistivity anomalies in the vicinity of Curie temperature ${(T}_{C}=33mathrm{K}$ in ambient pressure) that are intimately related to the formation and ordering of Co itinerant $3d$ electron moments. The Co magnetism in this material is a consequence of the itinerant electron metamagnetism (IEM) induced in a large exchange field appearing at ${T}_{C}$ where the localized Er moments order ferromagnetically. At lower pressures, ${T}_{C}$ decreases linearly with increasing pressure p $(ensuremath{partial}mathrm{ln}{T}_{C}/ensuremath{partial}p=0.24{mathrm{GPa}}^{mathrm{ensuremath{-}}1}).$ Magnetovolume measurements under pressure and magnetic-moment calculations performed for reduced lattice parameters reveal that also the Co moment decreases with increasing pressure. At higher pressures, the ${T}_{C}$ vs p dependence strongly deviates from the initial linear trend and above a critical pressure ${p}_{c}ensuremath{approx}4mathrm{GPa},$ the ${T}_{C}$ becomes nearly pressure independent. To explain this behavior we propose a scenario assuming that for $p>{p}_{c}$ the $3d$ band broadens to such extent that the projected $mathrm{Co}ensuremath{-}3d$ density of states in the vicinity of ${E}_{F}$ decreases critically and the Er-Co-Er exchange channel becomes ineffective to induce the IEM. The Er sublattice then orders at much lower temperature ${T}_{C}ensuremath{approx}13mathrm{K},$ which is determined by the Er-Er interaction channel mediated by conduction electrons. This scenario is corroborated by results of the ab initio calculations that indicate the collapse of IEM in pressures above a certain value." @default.
- W2318089932 created "2016-06-24" @default.
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- W2318089932 date "2001-01-12" @default.
- W2318089932 modified "2023-09-29" @default.
- W2318089932 title "Magnetism in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>ErCo</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>under high pressure" @default.
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- W2318089932 doi "https://doi.org/10.1103/physrevb.63.054433" @default.
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