
TY  - JOUR
A1  - Hudson, PRW 
A1  - Bomers, MC 
A1  - Fyans, RA 
T1  - How Isotopes Obscure the Anisotropic Phonon Umklapp Scattering in Dielectrics
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1976
VL  - 29
IS  - 2
SP  - 25
EP  - 30
KW  - 
UR  - https://doi.org/10.1071/PH760025 
N2  - Calculations of the thermal conductivity of h.c.p. 4He, doped with up to 1 % 3He, are presented using a Debye relaxation-time approach. The results are analysed to extract information on the exponents in the anisotropic phonon Umklapp relaxation rate. The results show that even if 1 % of 3He is present the exponents may be measured to within 7 % of their undoped value. Consequently, anisotropic phonon Umklapp parameters may be determined in crystals where natural isotopes exist 
ER  -

