Orbital Non-Fermi-Liquid Behavior in Cubic Ruthenates

Laad, M. S.; Bradarić, I.; Kusmartsev, F. V.

doi:10.1103/physrevlett.100.096402

Cited by 26 publications

(27 citation statements)

References 26 publications

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“…Minimization of the free energy with respect to D will give the expression As for the origin of the symmetry breaking, which gives rise to the vector b in LTO, we propose that there is an onset of orbital ordering, which takes place in LTO below a transition temperature T ch , arising from orbital degeneracy of t 2g sub-band 27,28 .…”

Section: Resultsmentioning

confidence: 99%

Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Jin

Zhang

et al. 2015

Nat Commun

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LiTi 2 O 4 is a unique compound in that it is the only known spinel oxide superconductor. The lack of high quality single crystals has thus far prevented systematic investigations of its transport properties. Here we report a careful study of transport and tunnelling spectroscopy in epitaxial LiTi 2 O 4 thin films. An unusual magnetoresistance is observed which changes from nearly isotropic negative to prominently anisotropic positive as the temperature is decreased. We present evidence that shows that the negative magnetoresistance likely stems from the suppression of local spin fluctuations or spin-orbit scattering centres. The positive magnetoresistance suggests the presence of an orbital-related state, also supported by the fact that the superconducting energy gap decreases as a quadratic function of magnetic field. These observations indicate that the spin-orbital fluctuations play an important role in LiTi 2 O 4 in a manner similar to high-temperature superconductors.

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Section: Resultsmentioning

confidence: 99%

Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Jin

Zhang

et al. 2015

Nat Commun

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“…An interesting question is whether the existence of two scattering rates is limited to strongly correlated electronic systems. It has recently been pointed out that such behavior may also exists in less strongly correlated 4d transition metal oxides such as (Ca,Ru)RuO 3 featuring strong multi-orbital correlations 8 .…”

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Magnetotransport properties of BaRuO3: Observation of two scattering rates

Ying

Liu

et al. 2011

Phys. Rev. B

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We report results of low-temperature magnetotransport and Hall measurements on single crystals of four-layered hexagonal (4H) and nine-layered rhombohedral (9R) BaRuO3 that provide insight into the structure-property relationships of BaRuO3 polymorphs. We found that 4H BaRuO3 possesses Fermi-liquid behavior down to the lowest temperature (T ) of our measurements, 1.8 K. On the other hand, 9R BaRuO3 was found to show a crossover in the temperature dependence of resistivity around 150 K, and the existence of two separate scattering rates at low temperatures. The magnetoresistance in the 9R BaRuO3 was found to be negative while that in the 4H BaRuO3 is positive. We propose that local moments may be present in 9R but not in 4H BaRuO3, which leads to distinctly different behavior in the two forms.

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“…[3][4][5][6] For 4d transition metal oxides, ruthenates, i.e., DRuO 3 where D is the divalent alkaline-earth species, have been extensively investigated. [7][8][9][10][11] It is established that the charge, spin, orbit, and lattice degrees of freedom coexist in these oxides and bring into competitions among multifold interactions which are comparable in energy scale but originate from these different degrees of freedom. These competitions would inevitably result in multi-degenerate states which have similar energy minimal but distinctly different physical properties.…”

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confidence: 99%

Enhanced ferromagnetism, metal-insulator transition, and large magnetoresistance in La1−xCaxMn1−xRuxO3 free of eg-orbital double-exchange

Liu

et al. 2014

Journal of Applied Physics

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Articles you may be interested inStructural, electrical, magnetic, and thermal studies of Cr-doped La 0.7 Ca 0.3 Mn 1 − x Cr x O 3 ( 0 ≤ x ≤ 1 ) manganites J. Appl. Phys. 107, 083905 (2010); 10.1063/1.3342462 Effect of Li doping on the magnetotransport properties of La 0.7 Ca 0.3−y Li y MnO 3 system: Decrease of metal-insulator transition temperature Variable-range hopping conductivity and absence of a true metal-insulator transition in La 0.7−δ Ca 0.3 Mn 1−y Fe y O 3The structure, ionic valences, magnetism, and magneto-transport behaviors of mixed valence oxides La 1Àx Ca x Mn 1Àx Ru x O 3 are systematically investigated. The simultaneous substitutions of La 3þ and Mn 3þ ions by Ca 2þ and Ru 4þ , respectively, are confirmed by the structural and ionic valence characterizations, excluding the presence of Mn 4þ and Ru 3þ ions. The enhanced ferromagnetism, induced metal-insulator transition, and remarkable magnetoresistance effect are demonstrated when the substitution level x is lower than $0.6, in spite of the absence of the Mn 3þ -Ru 4þ e g -orbital double-exchange. These anomalous magnetotransport effects are discussed based on the competing multifold interactions associated with the Mn 3þ -Ru 4þ super-exchange and strong Ru 4þ -Ru 4þ hopping, while the origins for the metal-insulator transition and magnetoresistance effect remain to be clarified. V C 2014 AIP Publishing LLC.

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Orbital Non-Fermi-Liquid Behavior in Cubic Ruthenates

Cited by 26 publications

References 26 publications

Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Magnetotransport properties of BaRuO3: Observation of two scattering rates

Enhanced ferromagnetism, metal-insulator transition, and large magnetoresistance in La1−xCaxMn1−xRuxO3 free of eg-orbital double-exchange

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