Structural and metal-insulator transitions in ionic liquid-gated Ca3Ru2O7 surface
Applied Physics Letters, ISSN: 0003-6951, Vol: 104, Issue: 25
2014
- 3Citations
- 21Captures
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Article Description
We report the fabrication and measurements of ionic liquid gated Hall bar devices prepared on the ab face of a thin Ca3Ru207 flake exfoliated from bulk single crystals that were grown by a floating zone method. The devices were categorized into two types: Those with their electrical transport properties dominated by r-axis transport in type A or that of the in-plane in type B devices. Bulk physical phenomena, including a magnetic transition near 56 K, a structural and metal-insulator transition at a slightly lower temperature, as well as the emergence of a highly unusual metallic state as the temperature is further lowered, were found in both types of devices. However, the Shubnikov-de Haas oscillations were found in type A but not type B devices, most likely due to enhanced disorder on the flake surface. Finally, the ionic liquid gating of a type B device revealed a shift in critical temperature of the structural and metal-insulator transition, suggesting that this transition is tunable by the electric field effect.
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