Table 1 Characteristic quantities for the oxide superconductors

From: Universal superconducting precursor in three classes of unconventional superconductors

Compound

Ξ (mK) (fit range)

Reduced χ2

|dTc / dPi| (K/GPa)

Coherence length (nm)

STO

22.4 ± 0.1 (0.36 K - 0.47 K)

2.5·10−3

0.25 ± 0.05 (ref. 24)

~30 (ref. 31)

SRO

75.0 ± 0.6 (1.55 K–2 K)

6.5·10−3

0.6 ± 0.2 (ref. 25)

~75 (ref. 5)

LSCO

358 ± 1 (36.5 K–38.5 K)

4.2·10−3

3.7 ± 1.3 (ref. 26)

~2 (ref. 32)

Hg1201

272 ± 3 (94.5 K–96.5 K)

7.8·10−3

2.3 ± 0.3 (ref. 26)

~2 (ref. 32)

  1. The sums of the squared residuals normalized to the number of experimental points (reduced χ2) is given for linear fits to the scaled log M3 curves (Fig. 2a) so as to be directly comparable. For SRO, LSCO, and Hg1201, the average in-plane values of the derivatives are used; the large error margin for LSCO reflects the fact that the two principal in-plane values differ by a factor of 2. For SRO, the dependence of Tc on Pa is strongly nonlinear, and we take the average slope between Tc = 1.5 K and Tc = 2 K by simply fitting a linear function to data for two samples in ref. 25
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