The contradictory physical properties and extreme anisotropy of Ca3Ru2O7

G. Cao, L. E. Delong, P. Schlottmann

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Scopus citations


The bilayered Ruddlesden-Popper (RP) compound Ca3Ru2O7 displays a wide variety of physical properties and exhibits the signatures of almost every ordered state (except for superconductivity) known in condensed matter physics, including exotic phenomena not found in other materials. For example, Ca3Ru2O7 exhibits conflicting hallmarks of both insulating and metallic states. We present a brief introduction to the layered ruthenates, and then discuss transport and thermodynamic properties of Ca3Ru2O7 with a focus on the following intriguing phenomena: (1) colossal magnetoresistance (CMR) via suppression of a ferromagnetic (FM) state, (2) strong spin valve effect in bulk single crystals, (3) quantum oscillations in a nonmetallic state, and (4) oscillatory magnetoresistance periodic in B (rather than 1/B). We argue that these novel properties derive from the orbital degrees of freedom of the Ru-ions, which drive a complex phase diagram via their couplings to spin (spin-orbit interaction) and the lattice (Jahn-Teller effect).

Original languageEnglish
Title of host publicationFrontiers of 4d- and 5d-Transition Metal Oxides
Number of pages36
ISBN (Electronic)9789814374866
StatePublished - Jan 1 2013

Bibliographical note

Publisher Copyright:
© 2013 by World Scientific Publishing Co. Pte. Ltd. All rights reserved.

ASJC Scopus subject areas

  • General Engineering
  • General Materials Science
  • General Physics and Astronomy


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