Bi2Sr2CaCu208+x
Value | Technique | Reference | Comments |
---|---|---|---|
Penetration depth (λ) | |||
λab(0) = 2600 Å ( Tc = 91 K) |
microwave surface impedance |
T. Jacobs et al, PRL 75, 4516 (1995) |
&Delta&lambdaab(T) ia shown in Fig. 2. At low temperatures, &Delta&lambdaab(T)∝T, which reflects an in-plane SC order parameter with nodes in the gap, d[&Delta&lambdaab(T)]/dT &sim 10Å/K leads to &lambdaab(T=0)&sim 2600Å |
λab(0)=2700Å |
lower critical field HC1 measurement |
M. Nideröst et al, PRL 81, 3231 (1998) |
Isothermal magnetization were measured for configurations of negligible geometrical barriers. At very low temperatures, creep over surface barriers is avoided and real HC1 is used to calculate λab(0). |
λab(0) ≅ 2100Å (Tc = 85K) |
reversible magnetization |
V. G. Kogan et al, PRL 70, 1870 (1993) |
By taking fluctuations into account, reversible magnetization data are used to determine λab(T) (See Fig. 2). |
λab(0) =1800 Å (Tc = 84 K) |
μSR |
S. L. Lee et al, PRL 71, 3862 (1993) |
The analysis of μSR line shapes at flux melting point (Eq. 2) yields λab(0). |