muSR and inelastic neutron scattering investigations of the caged type Kondo semimetals: CeT2Al10 (T=Fe, Ru and Os)

Abstract

Recently the Ce-based caged-type compounds having general formula CeT2Al10 (T=Fe, Ru and Os) have generated considerable interest due to the Kondo semiconducting paramagnetic ground state (down to 40 mK) observed in CeFe2Al10 and anomalously high magnetic ordering temperature with a spin gap formation at low temperatures in Kondo semimetals CeRu2Al10 and CeOs2Al10. The formation of long-range magnetic ordering out of the Kondo semiconducting/semimetallic state itself is extraordinary and these are the first examples of this enigmatic coexistence of electronic ground states. These compounds also exhibit strong anisotropy in the magnetic and transport properties, which has been explained on the basis of single ion crystal electric field (CEF) anisotropy in the presence of strongly anisotropic hybridization between localised 4f-electron and conduction electrons. Further they also exhibit a remarkable modification of magnetic and transport properties with doping on Ce, or T or Al sites. In this review we briefly discuss the bulk properties of these compounds, giving a detailed discussion on our muon-spin-relaxation (muSR) investigations and inelastic neutron scattering (INS) results.

36 pages, 21 figures, 2 tables. Physica Scripta (2013)

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Cited by in corpus (15)

• Kondo-lattice ferromagnets and their peculiar order along the magnetically hard axis
• Suppression of antiferromagnetic order and hybridization gap by electron- and hole-doping in the Kondo semiconductor CeOs${}_2$Al${}_{10}$
• Electronic Structures of CeM2Al10 (M = Fe, Ru, and Os) Studied by Soft X-ray Resonant and High-Resolution Photoemission Spectroscopies
• 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
• 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
• Anomalous change of the magnetic moment direction by hole doping in CeRu${}_2$Al${}_{10}$
• $\mu$SR and inelastic neutron scattering investigations of the noncentrosymmetric antiferromagnet CeNiC${}_2$
• Pr-magnetism in the quasi-skutterudite compound PrFe${}_2$Al${}_8$
• 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${}_{10}$ ($x\le 0.05$)
• Contrasting chemical pressure effect on the moment direction in the Kondo semiconductor CeT${}_2$Al${}_{10}$ (T = Ru,Os)
• Detailed neutron diffraction study of magnetic order in NdFe${}_2$Al${}_{10}$
• Anomalous quantum-critical spin dynamics in YFe2Al10
• Effect of Nd and Rh substitution on the spin dynamics of Kondo insulator CeFe2Al10
• Tuning the hybridization and magnetic ground state of electron and hole doped CeOs${}_2$Al${}_{10}$: an x-ray spectroscopy study
• Importance of anisotropic interactions for hard-axis/plane ordering of Ce-based ferromagnets