Table 1 Structural diameters from single-crystal XRD and fitting parameters of κL using the Debye model as described in the text.

The results from fitting Cp based on the combined Debye-Einstein model are in parentheses.

SpecimenYbCo2Zn20YbRh2Zn20YbIr2Zn20
Yb Wyckoff site8a8a8a
Zn1 Wyckoff site16c16c16c
Zn2 Wyckoff site96g96g96g
Yb-Zn1 (Å)3.0299(1)3.0633(1)3.0662(1)
Yb-Zn2 (Å)3.0873(4)3.0994(3)3.0928(4)
Zn1-Zn2 (Å)2.9859(3)3.0075(3)3.0059(4)
Zn2-Zn2 (Å)2.6010(4)/
2.6594(5)
2.6092(4)/
2.6714(5)
2.6049(6)/
2.6646(7)
Cage dimension (Å)5.9113(4)5.9549(4)5.9515(5)
Uiso of Yb (Å)0.00781(8)0.00688(9)0.00881(10)
θD (K)239(265)228(250)224(240)
v (m/s)391938263813
A (10−42 s3)8.812.417.5
B (10−18 s·K−1)2.60.71.8
C (1033 s−3)7.217.616
ω0 (THz)1.51.92.4
θE (K)72(76)91(95)115(110)