Back to Search Start Over

Phase diagram of Bi 2 Sr 2 CaCu 2 O 8+δ revisited.

Authors :
Drozdov IK
Pletikosić I
Kim CK
Fujita K
Gu GD
Davis JCS
Johnson PD
Božović I
Valla T
Source :
Nature communications [Nat Commun] 2018 Dec 06; Vol. 9 (1), pp. 5210. Date of Electronic Publication: 2018 Dec 06.
Publication Year :
2018

Abstract

In cuprate superconductors, the doping of carriers into the parent Mott insulator induces superconductivity and various other phases whose characteristic temperatures are typically plotted versus the doping level p. In most materials, p cannot be determined from the chemical composition, but it is derived from the superconducting transition temperature, T <subscript>c</subscript> , using the assumption that the T <subscript>c</subscript> dependence on doping is universal. Here, we present angle-resolved photoemission studies of Bi <subscript>2</subscript> Sr <subscript>2</subscript> CaCu <subscript>2</subscript> O <subscript>8+δ</subscript> , cleaved and annealed in vacuum or in ozone to reduce or increase the doping from the initial value corresponding to T <subscript>c</subscript>  = 91 K. We show that p can be determined from the underlying Fermi surfaces and that in-situ annealing allows mapping of a wide doping regime, covering the superconducting dome and the non-superconducting phase on the overdoped side. Our results show a surprisingly smooth dependence of the inferred Fermi surface with doping. In the highly overdoped regime, the superconducting gap approaches the value of 2Δ <subscript>0</subscript>  = (4 ± 1)k <subscript>B</subscript> T <subscript>c</subscript> .

Details

Language :
English
ISSN :
2041-1723
Volume :
9
Issue :
1
Database :
MEDLINE
Journal :
Nature communications
Publication Type :
Academic Journal
Accession number :
30523265
Full Text :
https://doi.org/10.1038/s41467-018-07686-w