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. 4.4.1 (RRR=300, T_min=200K, T_max=1000K)
  - https://www.engineeringtoolbox.com/specific-heat-metals-d_152.html

K_11: 8.055e+1
K_11,T: -1.051e-1
K_11,T^2: 5.464e-5

T_ref: 293.15

C_p: 450.0