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Heavy fermions, metal-to-insulator transition, and quantum criticality in La y Cu3Ru x Ti4−x O12

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Abstract

In this work we investigate the solid-solution series La y Cu3Ru x Ti4−x O12. The titanate La2/3Cu3Ti4O12 (x = 0) is an antiferromagnetic insulator exhibiting colossal dielectric constants, while the ruthenate LaCu3Ru4O12 (x = 4) is known as a rare d-electron derived heavy-fermion compound. Detailed structural investigations, AC- and DC-magnetization measurements, resistivity, specific-heat, and magnetic-resonance investigations have been performed for all polycrystalline compounds prepared by solid-state synthesis. These experiments have been accompanied by band-structure calculations. Close to the Ru concentration x = 2 we identify a quantum-critical point coinciding with a metal-to-insulator transition. The quantum-critical point separates an insulating spin glass from a paramagnetic metal. Interestingly, there is no evidence for a divergence of the effective mass upon reaching the quantum-critical point from the metallic side. In the paramagnetic metal, Ru behaves like a canonical Kondo ion. While the Ru oxidation state remains stable at + 4 for the whole concentration regime, the Cu valence seems to decrease from + 2 in the insulating antiferromagnet with localized copper spins to a significantly lower value in the metallic heavy-fermion compounds.

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Riegg, S., Widmann, S., Günther, A. et al. Heavy fermions, metal-to-insulator transition, and quantum criticality in La y Cu3Ru x Ti4−x O12 . Eur. Phys. J. Spec. Top. 224, 1061–1086 (2015). https://doi.org/10.1140/epjst/e2015-02446-3

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Keywords

  • Electron Spin Resonance
  • European Physical Journal Special Topic
  • Quantum Phase Transition
  • CaCu
  • Spin Moment