2013
DOI: 10.1103/physics.6.45
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Superconductivity on a Charge Diet

Abstract: The origin of superconductivity in bulk SrTiO 3 is a mystery since the nonmonotonous 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 Â 10 17 cm À3 , the system has both a sharp Fermi surface and a superconducting ground state. The most dilute superconductor currently known therefore has a… Show more

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