Strain-tunable metamagnetic transition in EuFe2As2 probed by x-ray magnetic circular dichroism
arXiv (Cornell University)(2020)
摘要
Of all parent compounds of iron-based high-temperature superconductors,
EuFe2As2 exhibits by far the largest magnetostructural coupling due to the
sizable biquadratic interaction between Eu and Fe moments. While the coupling
between Eu antiferromagnetic order and Fe structural/antiferromagnetic domains
enables rapid field detwinning, this prevents simple magnetometry measurements
from extracting the critical fields of the Eu metamagnetic transitions. Here we
measure these critical fields by combining x-ray magnetic circular dichroism
spectroscopy with in-situ tunable uniaxial stress and applied magnetic field.
The combination of two tuning knobs allows us to separate the stress-detwinning
of structural domains from the field-induced reorientation of Eu moments.
Intriguingly, from the critical field values we find that the Eu interplanar
interaction is strongly anisotropic. We argue that this anisotropic exchange
term is likely a consequence of the strong anisotropy in the magnetically
ordered Fe layer, which highlights the non-trivial interplay between Eu-Fe
magnetism in this system.
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关键词
metamagnetic circular dichroism,eufe2as2,circular dichroism,strain-tunable,x-ray
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