Joint annual meeting of Swiss and Austrian Physical Societies 2017

【640】 Evidence of electron-phonon interaction in single crystal of (Ru3+/Ru4+) mixed-valence Na2.7Ru4O9 and NaRu2O4

23 Aug 2017, 12:30

1h 30m

Poster Correlated-Electron Physics in Transition-Metal Oxides Poster Session

Speaker

Dr Arvind Yogi (1Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Korea 2Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea)

Description

We report a comprehensive investigation of the structural, electric transport, magnetic, and thermodynamic properties of Na2.7Ru4O9 and NaRu2O4 single crystals. The compounds are structurally different; Na2.7Ru4O9 crystalize in monoclinic (C 2/m) structure while NaRu2O4 crystalize in orthorhombic (P 21/ma) structure. We observed a first-order phase transition in the electrical resistivity at Tc = 365K and Tc = 530 K for Na2.7Ru4O9 and NaRu2O4, respectively. Resistivity is influenced by electron–phonon scattering and additionally inter-band electron scattering and the evidence for metal-like electronic contribution in heat capacity was also observed. The electronic contribution to the specific heat (gamma) for Na2.7Ru4O9 and NaRu2O4 was determined to be 26.91 and 3.93 mJ/mol K2, respectively.