Fermi Surface of the Most Dilute Superconductor
By Xiao Lin, Zengwei Zhu, B. Fauqué, Kamran Behnia. 2012
146 citations recorded by the source corpus.
The origin of superconductivity in bulk SrTiO$_{3}$ is a mystery, since the non-monotonous variation of the critical transition with carrier concentration defies the expectations of the crudest version of the BCS theory. Here, employing the Nernst effect, an extremely sensitive probe of tiny bulk Fermi surfaces, we show that down to concentrations as low as $5.5 \times 10^{17}cm^{-3}$, the system has both a sharp Fermi surface and a superconducting ground state. The most dilute superconductor currently known has therefore a metallic normal state with a Fermi energy as little as 1.1 meV on top of a band gap as large as 3 eV. Occurrence of a superconducting instability in an extremely small, single-component and barely anisotropic Fermi surface implies strong constraints for the identification of the pairing mechanism.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/3444c12486763f987a6a31eb451c885f5a8b68eb
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- C. Rischau
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- Y. Gallais
Citations in the corpus
- A ferroelectric quantum phase transition inside the superconducting dome of Sr1−xCaxTiO3−δ (2017, methodology): “Therefore the data were corrected assuming a temperature independent surface contribution Cbulk−1 = Cmeas−1 − Csurf−1, which results in ε(T ) curves comparable to literature data on surface-etched samples [6].”