. The Bell System technical journal . ^ (a) -SPIN + SPIN (b) -SPIN + SPIN (c) SPIN + SPIN. — iN(E) 0 0 ^N{E)-* NUMBER OF QUANTUM STATES AND ELECTRONS PER UNIT ENERGY Fig. 26—The paramagnetism of free electrons. (a) Distribution of electrons in energy. (b) Displacement of levels by a magnetic field. (c) Distribution of electrons in energy in a magnetic field. The number of states, bN, lying in this energy range in the band ofplus spin, which contains of course half the states in the band, is ac-cording to equation (3) m = }4N{Ei)8E = y2NiEi) magnetic moment of these states is 8M+ = - fi^
. The Bell System technical journal . ^ (a) -SPIN + SPIN (b) -SPIN + SPIN (c) SPIN + SPIN. — iN(E) 0 0 ^N{E)-* NUMBER OF QUANTUM STATES AND ELECTRONS PER UNIT ENERGY Fig. 26—The paramagnetism of free electrons. (a) Distribution of electrons in energy. (b) Displacement of levels by a magnetic field. (c) Distribution of electrons in energy in a magnetic field. The number of states, bN, lying in this energy range in the band ofplus spin, which contains of course half the states in the band, is ac-cording to equation (3) m = }4N{Ei)8E = y2NiEi) magnetic moment of these states is 8M+ = - fi^m = - y2N{Ei)ix^H. (13) (14) The minus sign occurs because the angular momentum and the mag-netic moment of an electron are in opposite directions; the states ofplus spin have minus moments in Fig. 26. The electrons that occupied these states before the field was appliednow occupy states with minus spin and produce a magnetic moment of bM- = }4N{E,)tx^m. (15) Hence the minus band gains a plus moment and the plus band loses a We have here assumed that the fractional change in N{E) i
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
