Orientation of nuclear spins in metals

摘要: In recent years, temperatures down to about 1/100-1/1000 degree absolute have been reached by means of the magnetic cooling method. This method, which was proposed Debye and Giauque, consists essentially isothermal magnetization a paramagnetic substance, followed adiabatic demagnetization. Kurti Simon (1935) shown that lowest can be this method are proportional interaction energy between dipoles substances used. Therefore, in order reach still lower temperatures, it these authors Gorter (1934) magnetism atomic nuclei should F. (1939) has recently discussed idea greater detail found possible realize experimentally. The question now arises what way, times will necessary properties nuclear spins at temperatures. * paper we shall investigate questions for metals. Here, conduction electrons leads an indirect coupling moments many metals is considerably larger than their direct interaction. We show any metal case becomes ferromagnetic with respect nuclei. Curie temperature 10-6 or less, consequently same magnitude. attainment such where orientated may great importance physics.