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GALVAnOMAGnETIC PROPERTIES OF METALS ATBOILInG OF LIQUID HELIUM

Acta Metallurgica Sinica(English Letters) 1997年第3期10卷 291-296页

作者： vr. sobolo.n. mazurenkoand a.a. drozd(Institute of Solid State and Semiconductor Physics, ASB P. Brovka Str., 17, Minsk 220072, Belarus) Inst of Solid State and Semiconductor Physics Minsk Belarus

Galvanomagnetic properties of metals at boiling point of liquid helium and some prob-lems relating to Joule heating in cylinder conductors are investigated by the method of voltage current cha.a.teristics. Radial current under an external coaxial magnetic field is used to get high magnetoresistance of conductor. High level of magnetore-sistance in this geometry offers the possibility to investigate a wide range of heat generation. The stabilization of voltage observed in definite current range is discussed in terms of a.a.ysis of heat aspects of problem when a heat genemtion function and heat elimination they are regarded at helium temperuture. An electric temperature ordering of system is proposed as a factor responsible for voltage stabilization when the presence of more heated and less heated sections along conductor radius is connected with negativity of derivative of heat elimination function with respect to temperature between first and second boiling crisis.

关键词： galvanomagnetic property current density critical temperature,cryogenic system

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EnERGY STORAGE In METAL DEVICES AnD THE ADVAnTAGES OF LIQUID HYDROGEnTEMPERATURES

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Acta Metallurgica Sinica(English Letters) 1997年第3期10卷 277-279,28-282页

作者： vr. sobolo.n.Mazurenkoa.a. drozd and B.B. Boiko(Institute of Solid State and Semiconductor Physics ASB, P. Brovka Str., 17, 220072 Minsk, Belarus) Inst of Solid State and Semiconductor Physics Minsk Belarus

Peculiarities of low temperature charge transport and enerpy accumulation in alu-minum devices are investigated by means of study of cylindrical conductors having a rudial cuerent fiow between inner and outer concentric contracts. Azimuthal current and, connected with it, self magnetic field are investigated in a wide range of radial current density up to 6000 A/cm2 under an external magnetic field up to 8 T Electron scattering processes are investigated and it is shown that rela.a.ion electron mechanisms are determined by strong temperature dependence on account of high sus-ceptibility of scattering to anisotropy of electron dispersion law. The role of thermal phonons is investigated through an effective averaged conductivity tensor of polycrystalline medium. Using da.a.of self magnetic self distribution on sample surface an energy density of self magnetic field is estimated. It is shown that at T=4.2 K average energy of self field may achieve at least 1 J/cm3. Using da.a.of rela.a.ion processes at temperature of liquid hydrogen it is established that self magnetic field must be a third of helium magnitude with respective self magnetic enengy density, spiral motion of carriers in this geometry being regarded as a current coils in usual inductive element.

关键词： energy storage charge transport magnetic field anisotropy

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