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Severe fermi surface reconstruction at a metamagnetic transition in Ca2-xSrxRuO4 (for 0.2≤x≤0.5)

  • Author(s): Balicas, L
  • Nakatsuji, S
  • Hall, D
  • Ohnishi, T
  • Fisk, Z
  • Maeno, Y
  • Singh, DJ
  • et al.
Abstract

We report an electrical transport study in Ca2-xSrxRuO4 single crystals at high magnetic fields (B). For x=0.2, the Hall constant Rxy decreases sharply at an anisotropic metamagnetic transition, reaching its value for Sr2RuO4 at high fields. A sharp decrease in the A coefficient of the resistivity T2 term and a change in the structure of the angular magnetoresistance oscillations for B rotating in the planes confirms the reconstruction of the Fermi surface. Our observations and local-density-approximation calculations indicate a strong dependence of the Fermi surface on Ca concentration and suggest the coexistence of itinerant and localized electronic states in single layered ruthenates. © 2005 The American Physical Society.

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