Electronic-Structure-Driven Magnetic Ordering in a Kondo Semiconductor CeOs2Al10

Abstract

We report the anisotropic changes in the electronic structure of a Kondo semiconductor CeOs${}_2$Al${}_{10}$ across an anomalous antiferromagnetic ordering temperature ($T_0$) of 29 K, using optical conductivity spectra. The spectra along the $a$- and $c$-axes indicate that a $c$-$f$ hybridization gap emerges from a higher temperature continuously across $T_0$. Along the b-axis, on the other hand, a different energy gap with a peak at 20 meV appears below 39 K, which is higher temperature than $T_0$, because of structural distortion. The onset of the energy gap becomes visible below $T_0$. Our observation reveals that the electronic structure as well as the energy gap opening along the b-axis due to the structural distortion induces antiferromagnetic ordering below $T_0$.

4 pages, 4 figures

References in corpus (6)

• Novel phase transition and the pressure effect in YbFe2Al10-type CeT2Al10 (T=Fe, Ru, Os)
• Semimetal to semimetal charge density wave transition in 1T-TiSe${}_2$
• Long-range magnetic order in CeRu2Al10 evidenced by muSR and neutron diffraction
• Structural Modification and Metamagnetic Anomaly in the Ordered State of CeOs2Al10
• Long-range order and low-energy magnetic excitations in CeRu2Al10
• Origin of Middle-Infrared Peaks in Cerium Compounds

Cited by in corpus (23)

• Crystal-field ground state of the orthorhombic Kondo insulator CeRu2Al10
• Optical study of charge instability in CeRu2Al10 in comparison with CeOs2Al10 and CeFe2Al10
• Anisotropic spin-dynamics in the Kondo semiconductor CeRu2Al10
• Anisotropic Electronic Structure of the Kondo Semiconductor CeFe2Al10 Studied by Optical Conductivity
• Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions
• High-field magnetization and magnetic phase transition in CeOs2Al10
• muSR and inelastic neutron scattering investigations of the caged type Kondo semimetals: CeT2Al10 (T=Fe, Ru and Os)
• Another dimension: investigations of molecular magnetism using muon-spin relaxation
• Competing 4f-electron dynamics in Ce(Ru1-xFex)2Al10 (x=0 to 1): magnetic ordering emerging from the Kondo semiconducting state
• Change of magnetic ground state by light electron-doping in CeOs2Al10
• Suppression of antiferromagnetic order and hybridization gap by electron- and hole-doping in the Kondo semiconductor CeOs${}_2$Al${}_{10}$
• Magnetic ordering with reduced cerium moments in hole-doped CeOs2Al10
• Electronic Structures of CeM2Al10 (M = Fe, Ru, and Os) Studied by Soft X-ray Resonant and High-Resolution Photoemission Spectroscopies
• Contrasting electron and hole doping effects on the spin gap of the caged type Kondo semimetal CeOs${}_2$Al${}_{10}$: A muon spin relaxation and inelastic neutron scattering investigation
• Quantitative study of valence and configuration interaction parameters of the Kondo semiconductors CeM2Al10 (M = Ru, Os and Fe) by means of bulk-sensitive hard x-ray photoelectron spectroscopy
• Anomalous change of the magnetic moment direction by hole doping in CeRu${}_2$Al${}_{10}$
• Relation between $c$-$f$ hybridization and magnetic ordering in CeRu${}_2$Al${}_{10}$: An optical conductivity study of Ce(Ru${}_{1-x}$Rh${}_x$)${}_2$Al${}_{10}$ ($x\le 0.05$)
• Observation of Electronic Structure Modification in the Hidden Order Phase of CeCoSi
• High temperature antiferromagnetism in Yb based heavy fermion systems proximate to a Kondo insulator
• Optical and photoelectrical studies on anisotropic metal-insulator transition of RuAs
• Doping Effects on the Electronic Structure of an Anisotropic Kondo Semiconductor CeOs${}_2$Al${}_{10}$: An Optical Study with Re and Ir Substitution
• Tuning the hybridization and magnetic ground state of electron and hole doped CeOs${}_2$Al${}_{10}$: an x-ray spectroscopy study
• A crossover from Kondo semiconductor to metallic antiferromagnet with $5d$-electron doping in CeFe${}_2$Al${}_{10}$