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Magnetic and transport properties in metallic and disordered Ru 2 VAl and Ru 2 VGa

Intermetallics, ISSN: 0966-9795, Vol: 161, Page: 107958
2023
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In this work, we report an elaborate study on the structural, magnetic and thermoelectric properties of two Ru-based Heusler alloys, viz., Ru 2 VAl and Ru 2 VGa, having valence electron count 24. While Ru 2 VGa exhibits a nonmagnetic ground state, in Ru 2 VAl a short range ferromagnetic interaction is developed below 10 K due to the structural antisite defects and disorder, that also manifests its signature in the specific heat and electrical resistivity measurements at low temperatures. Both the Seebeck coefficient ( S ) and Hall measurements suggest the dominance of hole-type carrier for electronic transport in Ru 2 VAl whereas Ru 2 VGa is found to be a n -type material. The linear nature and small absolute values of S, as well as non-zero values of electronic contribution to specific heat γ S ( γSRu2VAl  = 4.9 mJ/mol-K 2 and γSRu2VGa  = 5.5 mJ/mol-K 2 ) point towards a metallic ground state for both these alloys. Both the compounds exhibit lower thermal conductivity at room temperature in comparison to Fe-based Heusler alloys due to the presence of heavier element Ru.

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