13 research outputs found
Field-induced water electrolysis switches an oxide semiconductor from an insulator to a metal
Here we demonstrate that water-infiltrated nanoporous glass electrically
switches an oxide semiconductor from an insulator to metal. We fabricated the
field effect transistor structure on an oxide semiconductor, SrTiO3, using
100%-water-infiltrated nanoporous glass - amorphous 12CaO*7Al2O3 - as the gate
insulator. For positive gate voltage, electron accumulation, water electrolysis
and electrochemical reduction occur successively on the SrTiO3 surface at room
temperature, leading to the formation of a thin (~3 nm) metal layer with an
extremely high electron concentration of 10^15-10^16 cm^-2, which exhibits
exotic thermoelectric behaviour.Comment: 21 pages, 12 figure
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Electrodynamics of single-crystal Eu2CuO4 - A boson excitation spectrum
Static and microwave measurements of the electronic response of the planar cuprate Eu2CuO4 provide evidence for thermally activated collective excitations. These observations together with microwave and other measurements on superconductors suggest that paired charge-carrying objects may exist both above and below Tc in the superconductors. If these objects, which can be related to solitons of a spin density wave ground state, play a role in superconductivity, certain conclusions may be drawn. We discuss here the evidence for such objects and their implications. © 1989
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Microwave collective transport in single-crystal Eu2CuO
We measured the complex conductivity of single crystals of Eu2CuO4 from 3 to 15 GHz and observed collective transport with a sample-independent spectral weight. An unusual activated temperature dependence for the spectral weight, and anomalous temperature dependence of the Eu Mossbauer line, indicate magnetic effects well above the Néel temperature. The collective transport is similar to that observed in (TMTSF)2PF6 where TMSF denotes tetramethyltetrathiofulvalene and where charged, massive solitons are the suspected source of the transport. © 1988 The American Physical Society
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Electrodynamics of single-crystal Eu2CuO4 - A boson excitation spectrum
Static and microwave measurements of the electronic response of the planar cuprate Eu2CuO4 provide evidence for thermally activated collective excitations. These observations together with microwave and other measurements on superconductors suggest that paired charge-carrying objects may exist both above and below Tc in the superconductors. If these objects, which can be related to solitons of a spin density wave ground state, play a role in superconductivity, certain conclusions may be drawn. We discuss here the evidence for such objects and their implications. © 1989
Recommended from our members
Microwave collective transport in single-crystal Eu2CuO
We measured the complex conductivity of single crystals of Eu2CuO4 from 3 to 15 GHz and observed collective transport with a sample-independent spectral weight. An unusual activated temperature dependence for the spectral weight, and anomalous temperature dependence of the Eu Mossbauer line, indicate magnetic effects well above the Néel temperature. The collective transport is similar to that observed in (TMTSF)2PF6 where TMSF denotes tetramethyltetrathiofulvalene and where charged, massive solitons are the suspected source of the transport. © 1988 The American Physical Society