Table 1 Characteristics of the investigated YbRh2Si2 and 174YbRh2Si2 single crystals.

From: Superconductivity in an extreme strange metal

Sample

Batch

RRR10 mK

ρ0 (μΩcm)

A (μΩcm/K2)

\(\rho ^{\prime}_0\) (μΩcm)

\(A^{\prime}\) (μΩcm/K)

\({\gamma }_{{{{\rm{KW}}}}}^{0\ {{{\rm{T}}}}}\) (J/molK2)

YbRh2Si2

63113_1

67

1.19

20.2

1.23

1.17

1.42

174YbRh2Si2

Lap0288

123

0.55

14.8

0.59

0.85

1.22

  1. Both samples are from batches studied in detail previously17,32. Their residual resistance ratios RRR10 mK = R(300 K)/R(10 mK), as well as the zero-field Fermi liquid behavior ρ = ρ0 + AT2 below TN and the non-Fermi liquid behavior \(\rho =\rho ^{\prime}_0 +A^{\prime} T\) at the quantum critical field of 60 mT confirm high sample quality. To remove uncertainties in the geometric factors, we have assumed ρ(300 K) = 80 μΩcm15. The Sommerfeld coefficient in zero field \({\gamma }_{{{{\rm{KW}}}}}^{0\ {{{\rm{T}}}}}\), calculated from A via the universal Kadowaki–Woods ratio A/γ2 = 10−5 μΩcm(mol K)2/(mJ)2, is a good estimate of the non-quantum critical contribution (see Supplementary Note 2: Estimates on Planckian dissipation).
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