Galvanomagnetic Properties of Atomically Disordered Sr2RuO4 Single Crystals

Karkin, A. E.; Naumov, S. V.; Goshchitskii, B. N.; Balbashov, A. M.
June 2005
Journal of Experimental & Theoretical Physics;Jun2005, Vol. 100 Issue 6, p1142
Academic Journal
The effect of neutron-bombardment-induced atomic disorder on the galvanomagnetic properties of Sr2RuO4 single crystals has been experimentally studied in a broad range of temperatures (1.7–380 K) and magnetic fields (up to 13.6 T). The disorder leads to the appearance of negative temperature coefficients for both the in-plane electric resistivity (ρa) and that along the c axis (ρc), as well as the negative magnetoresistance Δρ, which is strongly anisotropic to the magnetic field orientation (H || a and H || c), with the easy magnetization direction along the c axis and a weak dependence on the probing current direction in the low-temperature region. The experimental ρa(T) and ρc(T) curves obtained for the initial and radiation-disordered samples can be described within the framework of a theoretical model with two conductivity channels. The first channel corresponds to the charge carriers with increased effective masses (∼10me , where me is the electron mass) and predominantly electron–electron scattering, which leads to the quadratic temperature dependences of ρa and ρc . The second channel corresponds to the charge carriers with lower effective masses exhibiting magnetic scattering at low temperatures, which leads to the temperature dependence of the ρa, c(T) ∝ 1/T type. © 2005 Pleiades Publishing, Inc.


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