Disappearance of superconductivity due to vanishing coupling in the overdoped Bi<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </math>Sr<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </math>CaCu<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </math>O<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>8</mn> <mo>+</mo> <mi>δ</mi> </mrow> </msub> </math>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31996671.
- Also identified by DOI 10.1038/s41467-020-14282-4 and PMC identifier 6989516.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
In cuprate superconductors, superconductivity is accompanied by a plethora of orders and phenomena that complicate our understanding of superconductivity in these materials. Prominent in the underdoped regime, these orders weaken or vanish with overdoping. Here, we approach the superconducting phase from the more conventional overdoped side. We present angle-resolved photoemission spectroscopy studies of Bi<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </math>Sr<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </math>CaCu<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </math>O<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>8</mn> <mo>+</mo> <mi>δ</mi> </mrow> </msub> </math>, cleaved and annealed in ozone to increase the doping all the way to the non-superconducting phase. We show that the mass renormalization in the antinodal region of the Fermi surface that possibly reflects the pairing, weakens with doping and completely disappears precisely where superconductivity disappears. This is the evidence that in the overdoped regime, superconductivity is determined primarily by the coupling strength. A doping dependence and an abrupt disappearance above the transition temperature eliminate phononic mechanism of the observed renormalization and identify the onset of spin-fluctuations as its likely origin.