Abstract
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 language | English |
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Title of host publication | Frontiers of 4d- and 5d-Transition Metal Oxides |
Pages | 179-214 |
Number of pages | 36 |
ISBN (Electronic) | 9789814374866 |
DOIs | |
State | Published - Jan 1 2013 |
Bibliographical note
Publisher Copyright:© 2013 by World Scientific Publishing Co. Pte. Ltd. All rights reserved.
ASJC Scopus subject areas
- Engineering (all)
- Materials Science (all)
- Physics and Astronomy (all)