Unconventional transport properties of the itinerant ferromagnet EuTi1-xNbxO3 (x=0.10-0.20)

Article

关键词: QUANTUM PHASE-TRANSITIONS;    ELECTRON FERROMAGNETS;    CRITICAL-POINT;    SRRUO3;    MAGNETORESISTANCE;    TEMPERATURE;    RESISTIVITY;    METALS;    STATE;   

DOI  :  10.1103/PhysRevB.98.134428

来源: SCIE

【 摘 要 】

The detailed analysis of resistivity (rho) for single-crystalline EuTi1-xNbxO3 (x = 0.10-0.20), an itinerant ferromagnet with very low Curie temperature (T-C), reveals that the charge conduction in this system is extremely sensitive to Nb concentration and dominated by several scattering mechanisms. Well below TC, where the spontaneous magnetization follows Bloch's T-3/2 law, rho exhibits T-2 dependence with a large coefficient (similar to 10(-1) mu Omega cm K-2) due to the electron-magnon scattering. Remarkably, all the studied samples exhibit a unique resistivity minimum at T = T-min, below which rho shows a logarithmic increment with T (for T-C < T < T-min) due to the Kondo scattering of 4d(1) itinerant electrons of Nb by the localized 4f moments of Eu2+ which suppresses strongly with applied magnetic field. In the paramagnetic state, T-2 and T-3/2 dependence of the resistivity have been observed, suggesting an unusual crossover from a Fermi-liquid to a non-Fermi-liquid behavior with increasing T.

【 授权许可】

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