Transport and thermodynamic properties of Sr3Ru 2O7 near the quantum critical point

Z. X. Zhou, S. McCall, C. S. Alexander, J. E. Crow, P. Schlottmann, A. Bianchi, C. Capan, R. Movshovich, K. H. Kim, M. Jaime, N. Harrison, M. K. Haas, R. J. Cava, G. Cao

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Abstract

The specific heat and electrical resistivity of Sr3Ru 2O7 single crystals are measured in several magnetic fields applied along the c axis for temperatures below 2 K and at fields up to 17 T. Near the critical metamagnetic field at B1* ∼ 7.8 T, the electronic specific heat divided by temperature increases logarithmically as the temperature decreases, over a large range of T, before saturating below a certain T* (which is sample dependent), indicating a crossover from a non-Fermi liquid (NFL) region dominated by quantum critical fluctuations to a Fermi liquid (FL) region. This crossover from a NFL to a FL state is also observed in the resistivity data near the critical metamagnetic field for I||c and B||c. The coefficient of electronic specific heat, γ, plotted as a function of field shows two peaks, consistent with the two metamagnetic transitions observed in magnetization and magnetic torque measurements. At the lowest temperatures, a Schottky-like upturn with decreasing temperature is observed. The coefficient of the Schottky anomaly exhibits a field dependence similar to that of γ, implying an influence by the electrons near the Fermi surface on the Schottky level splitting.

Original languageEnglish (US)
Article number140409
Pages (from-to)140409-1-140409-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number14
DOIs
StatePublished - Apr 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Zhou, Z. X., McCall, S., Alexander, C. S., Crow, J. E., Schlottmann, P., Bianchi, A., Capan, C., Movshovich, R., Kim, K. H., Jaime, M., Harrison, N., Haas, M. K., Cava, R. J., & Cao, G. (2004). Transport and thermodynamic properties of Sr3Ru 2O7 near the quantum critical point. Physical Review B - Condensed Matter and Materials Physics, 69(14), 140409-1-140409-4. [140409]. https://doi.org/10.1103/PhysRevB.69.140409