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Nested fermi surface and electronic instability in Ca3Ru2O7.

F Baumberger1, N J C Ingle, N Kikugawa

  • 1Department of Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, California 94305, USA.

Physical Review Letters
|April 12, 2006
PubMed
Summary
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Calcium ruthenate Ca(3)Ru(2)O(7) exhibits a metallic phase below 30 K, characterized by low-weight quasiparticle bands. An electronic instability at 48 K significantly reduces the Fermi surface volume, creating metallic pockets.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Ca(3)Ru(2)O(7) is a correlated metal exhibiting complex electronic behavior.
  • Understanding its low-temperature phases is crucial for materials science and condensed matter physics.

Purpose of the Study:

  • To investigate the electronic structure and phase transitions of Ca(3)Ru(2)O(7) using high-resolution angular resolved photoemission spectroscopy.
  • To elucidate the nature of the metallic phase and the electronic instability occurring at low temperatures.

Main Methods:

  • High-resolution angular resolved photoemission spectroscopy (ARPES) to probe electronic band structure.
  • Quantum oscillation measurements for complementary Fermi surface characterization.
  • Analysis of bulk structural phase transitions.

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Main Results:

  • Well-defined quasiparticle bands with low spectral weight observed in the metallic phase below 30 K.
  • Evidence of an electronic instability at the 48 K structural phase transition, leading to Fermi surface gapping.
  • Formation of small metallic pockets, resulting in a Fermi surface volume two orders of magnitude smaller than in other metallic ruthenates.
  • Fermi velocities and pocket volumes align with quantum oscillation data.

Conclusions:

  • Ca(3)Ru(2)O(7) displays a unique low-temperature electronic state driven by an electronic instability and Fermi surface nesting.
  • The reduced Fermi surface volume and metallic pockets are key features of its low-temperature metallic behavior.
  • ARPES and quantum oscillation measurements provide consistent insights into the electronic properties of this correlated material.