title: Composite Zn1-xCdxGeAs2semiconductors: structural and electrical properties.
abstract: We present the studies of structural, transport and magnetotransport properties of [Formula: see text]CdxGeAs2crystals with the chemical content changing from 0 to 1. The structural studies indicate that this alloy exists as a composite two-phase material in almost the entire range of average chemical compositions. The two phase nature of our samples does have a significant influence on the carrier transport and magnetotransport of the composite alloy. The change of the conductivity type is observed at room temperature, from p-type for [Formula: see text] to n-type for x  >  0.18, respectively. The Hall carrier mobility measured at room temperature decreases as a function of x from about 35 cm2(V · s)-1for the sample with x  =  0 down to 3 cm2(V · s)-1for the sample with x  =  0.233. For x  >  0.233 the Hall carrier mobility shows an increase with x, up to the highest value around 875 cm2(V · s)-1observed for the sample with x  =  1. Temperature dependent resistivity measurements indicate the presence of thermal activation of carriers with activation energy, Ea, with values from 20 to 30 meV for all the studied samples. The temperature dependent Hall effect data show that the grain boundary limited transport is strong in all our samples. For the samples with [Formula: see text] the negative MR is observed at temperatures lower than 100 K and at low magnetic field values, [Formula: see text] T. This effect is interpreted as a weak localization phenomenon with low values of phase coherence length, [Formula: see text] nm.
authors.affiliation: Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland.
authors.forename: L
authors.initials: L
authors.lastname: Kilanski
authors.forename: A
authors.initials: A
authors.lastname: Reszka
authors.forename: M
authors.initials: M
authors.lastname: Górska
authors.forename: V
authors.initials: V
authors.lastname: Domukhovski
authors.forename: A
authors.initials: A
authors.lastname: Podgórni
authors.forename: B J
authors.initials: BJ
authors.lastname: Kowalski
authors.forename: W
authors.initials: W
authors.lastname: Dobrowolski
authors.forename: I V
authors.initials: IV
authors.lastname: Fedorchenko
authors.forename: A N
authors.initials: AN
authors.lastname: Aronov
authors.forename: S F
authors.initials: SF
authors.lastname: Marenkin