Results 1 - 10 of 1918
Results 1 - 10 of 1918. Search took: 0.025 seconds
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[en] Measurements at low temperatures (1.5 to 11K) of the electrical resistivity and thermal conductivity of pnictide compounds LnSb (Ln = La, Er, Tm) are reported as well as the induced moment system PrCu5. The anomalous temperature dependence of these transport properties provide strong evidence of an increased scattering of the carriers through exchange and aspherical Coulomb interaction with the localized 4f electrons
[en] For magnetically ordered intermetallic compounds such as PrAl2, Pr3Tl and TbSb neutron inelastic scattering experiments show that the spin-wave spectrum consists of several branches of excitations. These correspond at T = 0 to allowed transitions between the ground state and excited states of the lowest multiplet of the rare-earth ion in the exchange field existing in the material. A good description of the spin-wave spectrum can be obtained within the random phase approximation with crystal field terms and interionic interactions. At elevated temperatures excited-state spin waves are observed which correspond to transitions between excited states of the multiplet. Close to the ordering temperature and ordering wavevector the spectrum is dominated by elastic scattering with less important contributions from inelastic transitions. Generalization of the spin-wave theory to finite temperatures leads to a qualitatively correct description of these effects and insight into the nature of the ''central'' mode
[en] The phase equilibria of the Sb-Y and Al-Sb-Y systems were analyzed and a complete thermodynamic description of this ternary system was obtained. The thermodynamic descriptions of the other two binary systems were taken from the literature. Most of the binary intermetallic phases, except Sb3Y5, were assumed to have no ternary solubility. Based on the experimental data, the calculated phase equilibria were in good agreement with the experimental data.