Low-temperature anomalous spin correlations and Kondo effect in ferromagnetic SrRuO3/LaNiO3/La0.7Sr0.3MnO3

Abstract

A systematic comparative study of the electronic transport and ferromagnetic resonance of ultrathin trilayers (TLs) of SrRuO3/LaNiO3/ La0.7Sr0.3MnO3 on (001)-and (111)-oriented SrTiO3 (STO) substrates has been reported. An unusual upturn in resistivity ρ(T) at low-temperature (so called Kondo-like behaviour) accompanied by the negative magneto-resistance has been observed. For temperatures larger than the Kondo temperature (TK), ρ(T) is in good agreement with the Hamann's impurity resistivity model ρ(T >TK) ∝ (ln(T /TK)) −2 for spin S=1/2 and 3/2 for the TLs on (001)-STO and (111)-STO, respectively. At the temperatures T ≫ TK, electron-electron (ρ(T)∝ T 2) contribution dominates over those appearing due to the electron-phonon interaction (ρ(T)∝ T 5) and 2-Magnon scattering. Using the ferromagnetic resonance near the Curie temperature of La0.7Sr0.3MnO3, we evaluated the contribution of surface anisotropies (Ks) as well as in-plane volume anisotropies (Kν) : Ks ∼ −9.57 × 10 −4 J/m 2 (-6.68 ×10 −4 J/m 2) and Kν ∼ 4.04 × 10 5 J/m 3 (3.31×10 5 J/m 3) for the TLs on (001)-STO (TLs on (111)-STO). In addition, the Gilbert damping constant is determined which varies between 0.32 (0.23) and 0.16 (0.19) having spin mixing conductance, g ↑↓ = 5.2×10 19 m −2 (13.38×10 19 m −2) for TLs on (001)-STO ((111)-STO).

Electronic properties in itinerant ferromagnet SrRu1−x Ti x O3

“…As evident, both the parameters do not change appreciably and remain nearly constant within the limit of error bar. This field-independent nature of coefficient C is further regarded as typical feature of Kondo behavior [52,53,54]. Therefore, this low temperature minimum in ρ(T ) in present series (x ≤ 0.3) is likely due to Kondo-like behavior.…”

“…Recently, the possibility of Kondo behavior has been discussed in SrRuO 3 films. [52] The parameters (ρ 0K and C) obtained from fitting of Eq. 8 are given in Table II in 0 and 8 T field for x ≤ 0.3.…”

Probing the strongly correlated magnetic state of Co2C nanoparticles at low temperatures using μSR

“…The sharp fall below T EB and the consequent resistivity upturn at lower temperatures is fit using two forms. The solid yellow curve in figure 1(d) is a fit to the data in regime II using the equation [42,43]…”

Interfacial reconstruction in La0.7Sr0.3MnO3 thin films: giant low-field magnetoresistance

“…The resistivity at T < T Min for the LSMO films [Fig. S5 † ] was fitted using the following expression: 29 where ρ 0 is the residual resistivity, the second term is due to the contribution of electron–electron scattering, the third term is the spin-dependent Kondo-like effect, and the last term is related to the inelastic scattering. The fitting result as denoted by the solid lines in Fig.…”