references:
  - J.G. Hust and A.B. Lankford,
    Thermal Conductivity of Aluminum, Copper, Iron, and Tungsten from 1K to the Melting Point,
    US Department of Commerce, Boulder, Colorado, 1984,
    fit to Tab. 3.4.1 (RRR=1000, T_min=200K, T_max=900K)
  - https://www.engineeringtoolbox.com/specific-heat-metals-d_152.html

K_11: 2.380e+2
K_11,T: 2.068e-3
K_11,T^2: -7.765e-5

T_ref: 293.15

C_p: 910.0