Optical spectroscopy and electronic band structure of ferromagnetic EuB6

Jungho Kim, Young June Kim, J. Kuneš, B. K. Cho, E. J. Choi

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We present an optical conductivity of EuB6 over a wide range (2 meV-5.5 eV) from reflectivity and ellipsometry measurements. Upon the ferromagnetic transition at Tc =15.5 K, interband transition σ1 (ω) decreases below ω=3.3 eV and the lost spectral weight is transferred to the Drude σ1 (ω) at ω<0.33 eV. Further a high-energy optical peak at around 4 eV exhibits a large splitting below Tc. We explain these high-energy σ1 (ω) changes, that is, spectral-weight recovery and peak splitting, using local-density approximation+U band-structure calculations. Our finding suggests strongly that: (1) EuB6 is a semimetal and (2) the exchange-driven band splitting is the primary source of the drastic ωp2 change at T<Tc.

Original languageEnglish
Article number165120
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number16
StatePublished - 24 Oct 2008


Dive into the research topics of 'Optical spectroscopy and electronic band structure of ferromagnetic EuB6'. Together they form a unique fingerprint.

Cite this