Thermal and Transport Behavior of Single Crystalline R2CoGa8 R = Gd, Tb, Dy, Ho, Er, Tm, Lu and Y Compounds - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: The anisotropy in electrical transport and thermal behavior of singlecrystalline R$ {2}$CoGa$ {8}$ series of compounds is presented. These compoundscrystallize in a tetragonal structure with space gropup P4-mmm. The nonmagneticcounterparts of the series namely Y$ {2}$CoGa$ {8}$ and Lu$ {2}$CoGa$ {8}$showa behavior consistent with the low density of states at the fermi level. InY$ {2}$CoGa$ {8}$, a possibility of charge density wave transition is observedat $\approx$ 30 K. Gd$ {2}$CoGa$ {8}$ and Er$ {2}$CoGa$ {8}$ show a presence ofshort range correlation above the magnetic ordering temperature of thecompound. In case of Gd$ {2}$CoGa$ {8}$, the magnetoresistance exhibits asignificant anisotropy for current parallel to {}100{} and {}001{}directions. Compounds with other magnetic rare earths R = Tb, Dy, Ho and Tmshow the normal expected magnetic behavior whereas Dy$ {2}$CoGa$ {8}$ exhibitsthe possibility of charge density wave CDW transition at approximately sametemperature as that of Y$ {2}$CoGa$ {8}$. The thermal property of thesecompounds is analysed on the basis of crystalline electric field CEFcalculations.



Autor: Devang A. Joshi, A. K. Nigam, S. K. Dhar, A. Thamizhavel

Fuente: https://arxiv.org/



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