High-temperature superconductivity in monolayer Bi2Sr2CaCu2O8+δ

Extended Data Fig. 3 | Extracting 
T
c
 and 
T* from temperature-dependent 
resistance of monolayer Bi-2212. a, Illustration of T
c
and T* extraction from 
temperature-dependent resistance (black curve, which mostly overlaps with the 
red curve) and its derivative (blue curve). We used two definitions of T
c
in our 
analysis: (i) T
c,diff
where the slope of resistance vs temperature curve is 
maximum
70
; (ii) T
c0
from fitting with Aslamasov–Larkin paraconductivity 
model
71
Δσ σ T
σ
T
a T T
= ( ) −
( ) = ( /
− 1)
normal
c0
−1
. Near optimal doping, 
σ
T
bT c
( ) = (
+ )
normal
−1
, so T
c0
can be extracted from fitting with 
R T
bT c T T
T T
a
( ) = (
+ )( −
)/( −
+ )
c0
c0
(red curve). T* is determined as the 
temperature at which the derivative of temperature-dependent resistance 
deviates from constant value (broken blue line; ref. 
72
). b, c, T
c,diff
max
(b) and T
c0
max
(c) 
of monolayer and bulk Bi-2212. Bulk data were obtained from optimally doped 
crystals (OP88). Under both definitions, the highest maximum T
c
of monolayers 
is within the statistical uncertainty range of the T
c
in optimally doped bulk 
crystals.

---

Article
Extended Data Fig. 4 | See next page for caption.

---