High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene
0301 basic medicine
Condensed Matter - Materials Science
Condensed Matter - Mesoscale and Nanoscale Physics
Strongly Correlated Electrons (cond-mat.str-el)
Condensed Matter - Superconductivity
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
01 natural sciences
Superconductivity (cond-mat.supr-con)
Condensed Matter - Strongly Correlated Electrons
03 medical and health sciences
0103 physical sciences
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
DOI:
10.1038/ncomms6708
Publication Date:
2014-12-08T10:40:03Z
AUTHORS (16)
ABSTRACT
23 pages, 4 figures<br/>High-T_c superconductors confined to two dimension exhibit novel physical phenomena, such as superconductor-insulator transition. In the Bi_2Sr_2CaCu_2O_8+x (Bi2212) model system, despite extensive studies, the intrinsic superconducting properties at the thinness limit have been difficult to determine. Here we report a method to fabricate high quality single-crystal Bi2212 films down to half-unit-cell thickness in the form of graphene/Bi2212 van der Waals heterostructure, in which sharp superconducting transitions are observed. The heterostructure also exhibits a nonlinear current-voltage characteristic due to the Dirac nature of the graphene band structure. More interestingly, although the critical temperature remains essentially the same with reduced thickness of Bi2212, the slope of the normal state T-linear resistivity varies by a factor of 4-5, and the sheet resistance increases by three orders of magnitude, indicating a surprising decoupling of the normal state resistance and superconductivity. The developed technique is versatile, applicable to investigate other two-dimensional (2D) superconducting materials.<br/>
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