300

250

200

185

180

Pressure (GPa)

Ref. [30]

1.54

1.70

2.19

2.48

2.73

λ_opt

Ref. [30]

1680.2

1566.8

1334.6

1175.5

1079.4

ϖ (K)

Equation (7)

195.9

199.6

203.5

192.6

186.0

$T_c^{°}$ (K)

Equation (9)

252.28

272.56

325.05

334.92

345.21

T_c (K)

Equation (8)

0.49

0.49

0.49

0.49

0.49

α

Equation (11)

0.40

0.40

0.42

0.43

0.43

α