Table 2.

Approximation parameters according to the tunneling model (4).

MgO (vol.%)	σ0 (S/m)	T1 (K)	T0 (K)	${\mathit{V}}_0\left(\mathbf{meV}\right)$	w (nm)
0	2.5 × 10−6	34.8	10.3	7.6	4.9
0.25	2.6 × 10−4	57.4	22.1	8.3	3.7
0.46	6.1 × 10−4	45.7	9.3	9.9	6.4
1	1.5 × 10−4	30.6	5.4	8.9	7.8
2	5.3 × 10−6	33.5	4.7	10.1	9.2