That constant appears in an empirical law named for him which sets magnetization proportional to magnetic field over temperature and in a formula giving the susceptibility at a given temperature; the latter is a law he names with Weiss.
This man names a principle giving the symmetry groups of a crystal under an external influence, his "dissymmetry principle." A constant named for this physicist equals permeability squared times N times the g-factor squared times J times quantity J plus one, all over quantity three times Boltzmann's constant, where J is the total angular momentum quantum number. That constant appears in an empirical law named for him which sets magnetization proportional to magnetic field over temperature and in a formula giving the susceptibility at a given temperature; the latter is a law he names with Weiss. He and his older brother Jacques discovered piezoelectricity. The temperature above which ferromagnetism no longer exists is named for him. For 10 points, name this man who won a Nobel with his wife Marie.
This man names a principle giving the symmetry groups of a crystal under an external influence, his "dissymmetry principle.
Pierre Curie [prompt on "Curie"]