Search for Cooper-pair fluctuations in severely underdopedY1−δCaδBa2Cu3O6+xfilms (δ=0and 0.2)
| Autor: | Iulian Hetel, Thomas R. Lemberger, Yuri L. Zuev |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Superconductivity
Physics Condensed matter physics 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Superfluidity Condensed Matter::Superconductivity 0103 physical sciences Cuprate Cooper pair 010306 general physics 0210 nano-technology Pseudogap |
| Zdroj: | Physical Review B. 74 |
| ISSN: | 1550-235X 1098-0121 |
| Popis: | The preformed-pairs theory of pseudogap physics in high-${T}_{C}$ superconductors predicts a nonanalytic $T$ dependence for the $ab$-plane superfluid fraction, ${\ensuremath{\rho}}_{S}$, at low temperatures in underdoped cuprates. We report high-precision measurements of ${\ensuremath{\rho}}_{S}(T)$ on severely underdoped $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6+x}$ and ${\mathrm{Y}}_{0.8}{\mathrm{Ca}}_{0.2}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6+x}$ films. At low $T$, ${\ensuremath{\rho}}_{S}$ looks more like $1\ensuremath{-}{T}^{2}$ than $1\ensuremath{-}{T}^{3∕2}$, in disagreement with theory. |
| Databáze: | OpenAIRE |
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