Table 1. Parameters for doped SrTiO₃.

n nm−3		λ*		d ln m*/d ln M	α	β
0.004	2.9	0.091	17	0.25	−2.0	−4.5
0.020	7.1	0.104	7	0.24	−1.8	−4.1
0.100	20	0.115	2.5	0.20	−1.3	−3.0

For the fourth column ħω₀ = 50 meV was used. See ref. 9 for the values of ϵ_F as a function of carrier concentration. The the log-derivatives of the mass and the α- and β-coeffients and were calculated with Eqs 9, 4 and 6 (Methods) respectively.