Abstract
Abstract The lattice thermal conductivity of gallium has been derived by means of three methods: 1) alloying pure gallium with small amounts of impurities, 2) application of a large magnetic field to reduce the electron contribution, 3) by reducing the temperature below the critical temperature. The impurity method is shown to be unpractical for gallium; only for 6 T a axis) a value of k g = 4.5 × 10 -4 T 2 W/k cm was derived. The magnetic method yields values slightly higher, 5.3 × 10 -4 T 2 for the a axis and 8.5 × 10 -4 T 2 and 6.0 × 10 -4 T 2 for the b and c axes, respectively. Using these values and data of Zavaritskiǐ the values of k gs / k gn , the ratio of the lattice conductivities in the superconductive and the normal states, are calculated. Comparing these results with B.C.S. theory the difference is found to occur beyond experimental error. The ideal thermal resistivity W id and θ id are compared with the variation of the Debye temperature and with theory. Rotation diagrams of the thermal and electrical resistivities of very pure single crystals are compared with earlier work. The magneto-resistance is found to follow a power law in H with a resistance-dependent power; possible explanations of this behaviour are discussed.
Published Version
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