Suppression of magnetic ordering in Fe-deficient Fe[subscript 3;#8722;x]GeTe[subscript 2] from application of pressure
Abstract not provided
OHara, Dante J.↗
Engineering topics
Zieve, Rena J.
Publications and source records attributed to Zieve, Rena J..
Interfacial-Redox-Induced Tuning of Superconductivity in YBa 2 Cu 3 O 7-δ
Solid-state ionic approaches for modifying ion distributions in getter/oxide heterostructures offer exciting potentials to control material properties. Here, we report a simple, scalable approach allowing for manipulation of the superconducting transition in optimally doped YBa 2 Cu 3 O 7-δ (YBCO) films via a chemically driven ionic migration mechanism. Using a thin Gd capping layer of up to 20 nm deposited onto 100 nm thick epitaxial YBCO films, oxygen is found to leach from deep within the YBCO. Progressive reduction of the superconducting transition is observed, with complete suppression possible for a sufficiently thick Gd layer. These effects arise from the combined impact of redox-driven electron doping and modification of the YBCO microstructure due to oxygen migration and depletion. Finaly, this work demonstrates an effective step toward total ionic tuning of superconductivity in oxides, an interface-induced effect that goes well into the quasi-bulk regime, opening-up possibilities for electric field manipulation.
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
Pressure-driven valence increase and metallization in the Kondo insulator Ce 3 Bi 4 Pt 3
We report the results of high-pressure x-ray diffraction, x-ray absorption, and electrical transport measurements of the Kondo insulator (KI) Ce 3 Bi 4 Pt 3 up to 42 GPa, the highest pressure reached in the study of any Ce-based KI. Here, we observe a smooth decrease in volume and movement toward intermediate Ce valence with pressure, both of which point to increased electron correlations. Despite this, temperature-dependent resistance data show the suppression of the interaction-driven ambient pressure insulating ground state. We also discuss potential ramifications of these results for the predicted topological KI state.
36 MATERIALS SCIENCE↗