Thermal and Transport Behavior of Single Crystalline R2CoGa8 (R = Gd, Tb, Dy, Ho, Er, Tm, Lu and Y) Compounds

Abstract

The anisotropy in electrical transport and thermal behavior of single crystalline R${}_2$CoGa${}_8$ series of compounds is presented. These compounds crystallize in a tetragonal structure with space gropup P4/mmm. The nonmagnetic counterparts of the series namely Y${}_2$CoGa${}_8$ and Lu${}_2$CoGa${}_8$show a behavior consistent with the low density of states at the fermi level. In Y${}_2$CoGa${}_8$, a possibility of charge density wave transition is observed at $\approx$ 30 K. Gd${}_2$CoGa${}_8$ and Er${}_2$CoGa${}_8$ show a presence of short range correlation above the magnetic ordering temperature of the compound. In case of Gd${}_2$CoGa${}_8$, the magnetoresistance exhibits a significant anisotropy for current parallel to {[}100{]} and {[}001{]} directions. Compounds with other magnetic rare earths (R = Tb, Dy, Ho and Tm) show the normal expected magnetic behavior whereas Dy${}_2$CoGa${}_8$ exhibits the possibility of charge density wave (CDW) transition at approximately same temperature as that of Y${}_2$CoGa${}_8$. The thermal property of these compounds is analysed on the basis of crystalline electric field (CEF) calculations.

arXiv comment10 Pages 14 Figures. Submitted to PRB

References in corpus (1)

• In-plane and transverse superconducting fluctuation diamagnetism in the presence of charge-density waves in 2H-NbSe2 single crystals

Cited by in corpus (2)

• Steplike metamagnetic transitions in a honeycomb lattice antiferromagnet Tb${}_2$Ir${}_3$Ga${}_9$
• The magnetic structures of the anisotropic inter-metallic compounds Er${}_2$CoGa${}_8$ and Tm${}_2$CoGa${}_8$