Enhancement of the anomalous Hall effect and spin glass behavior in the bilayered manganite La2−2xSr1+2xMn2O7

Hirobe, Y.; Ashikawa, Y.; Kawasaki, R.; Noda, Kohei; Akahoshi, Daisuke; Kuwahara, H.

doi:10.1016/j.ssc.2005.11.016

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…Among the more recent results obtained in other materials, one can mention the value of n = 1.9 between the two limits of n = 1 and 2 in the models above, found for heterostructures (In, Mn) As/(Ga, Al) Sb [10], and n ≈ 0.6 outside these limits, as determined in granulated films of Fe/SiO 2 [24]. On the other hand, neither the laws R s ∼ ρ n with n = 1 or 2, nor their combination R s = (aρ + bρ 2 ) were found to interpret the AHE in the colossal magnetoresistive oxides La 1−x Ca x CoO 3 [18] and La 2−2x Sr 1+2x Mn 2 O 7 [19].…”

Section: Resultsmentioning

confidence: 89%

“…Generally, the anomalous Hall effect (AHE) is observed not only in purely FM compounds, and so the observation of this phenomenon cannot be regarded as a proof of an FM state [9]. At this point, the utilization of equation ( 1) for the interpretation of the Hall effect, which has been done (sometimes with modifications) in a variety of diluted magnetic semiconductors [9-11, 16, 17] or other types of magnetic materials, as, e.g., the colossal magnetoresistive oxides [17][18][19], should be performed with a certain caution, regarding it only as a phenomenological equation with limited applicability. Such applicability in our case of evidently non-FM compound can partially be substantiated by saturation of the magnetization when B is increased taking place already at 300 K (see section 1), so that the second term in equation (1) becomes independent of B and the plots of ρ H versus B should tend to linear functions.…”

Section: Resultsmentioning

confidence: 99%

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The Hall effect in Ni-doped p-CdSb in a strong magnetic field

Laiho¹,

Lashkul²,

Лисунов³

et al. 2008

Semicond. Sci. Technol.

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The Hall effect in single crystals of the group II-V semiconductor p-CdSb doped with 2 at% of Ni is investigated between T = 1.5 and 300 K in pulsed magnetic fields up to B = 25 T. The Hall resistivity, ρ H , exhibits a nonlinear dependence on B, which is strongly pronounced below ∼10 K but is still observed even up to 300 K. The analysis of ρ H (B) gives evidence for the presence of a positive normal and a negative anomalous contribution, ρ N = R 0 B and ρ A , respectively. The temperature dependence of the (normal) Hall coefficient R 0 is determined by the activation of holes into the valence band with a small contribution of the itinerant holes from the acceptor band at lowest T. The dependence of ρ A on T is quite different within two temperature intervals, being weak between ∼50 and 300 K and very strong below ∼50 K, the latter resembling that of the resistivity, ρ. Analysis of ρ A below ∼77 K demonstrates that it scales approximately as ρ n with n = 1.6 ± 0.1 within four decades of ρ A and more than two decades of ρ. The anomalous Hall effect in p-CdSb:Ni is attributable to the presence of magnetic Ni-rich nanoclusters, whose properties have previously been investigated by the analysis of the magnetization data.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

The Hall effect in Ni-doped p-CdSb in a strong magnetic field

Laiho¹,

Lashkul²,

Лисунов³

et al. 2008

Semicond. Sci. Technol.

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“…In layered manganites La 2−x Sr 1+x Mn 2 O 7 an additional contribution to the AHE is observed possibly related to the intrinsic inhomogeneity resulting from the spin glass state [381,382]. In contrast to the manganites, the pyrochlore Tl 2 Mn 2 O 7 exhibits a negligible AHE and its CMR near T C is governed by a change in charge carrier density [383].…”

Section: Colossal Magnetoresistive Manganitesmentioning

confidence: 99%

Hall effect in heavy fermion metals

Nair

Wirth

Friedemann

et al. 2012

Advances in Physics

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The heavy fermion systems present a unique platform in which strong electronic correlations give rise to a host of novel, and often competing, electronic and magnetic ground states. Amongst a number of potential experimental tools at our disposal, measurements of the Hall effect have emerged as a particularly important one in discerning the nature and evolution of the Fermi surfaces of these enigmatic metals. In this article, we present a comprehensive review of Hall effect measurements in the heavy-fermion materials, and examine the success it has had in contributing to our current understanding of strongly correlated matter. Particular emphasis is placed on its utility in the investigation of quantum critical phenomena which are thought to drive many of the exotic electronic ground states in these systems. This is achieved by the description of measurements of the Hall effect across the putative zero-temperature instability in the archetypal heavy-fermion metal YbRh 2 Si 2 . Using the CeM In 5 (with M = Co, Ir) family of systems as a paradigm, the influence of (antiferro-)magnetic fluctuations on the Hall effect is also illustrated. This is compared to prior Hall effect measurements in the cuprates and other strongly correlated systems to emphasize on the generality of the unusual magnetotransport in materials with non-Fermi liquid behavior. Advances in Physics Hallreview7x 7. Comparison to Hall effect of other correlated materials 62 7.1. Copper oxide superconductors and related systems 62 7.1.1. Cuprates 62 7.1.2. Comparison of cuprates and heavy-fermion systems 67 7.1.3. Hall effect in oxy-pnictides and related systems 69 7.2. Other systems of related interest 70 7.3. Colossal magnetoresistive manganites 70 8. Summary 73 9. AppendixAdvances in Physics Hallreview7x 6 a) b) T N SDW non-FL LFL δ T c δ T 0 T T N antiferromagnetic order * LFL T non-FL LFL δ T c δ T 0 Figure 1. Comparison of quantum criticality in a) the spin-density wave (SDW) and b) the locally critical scenario.δ refers to an external control parameter for tuning the material to its QCP at δc. The hatched areas indicate phase space regions within which the heavy quasi-particles are formed, whereas the arrows illustrate the existence of local magnetic moments. In the local scenario (b) the quasi-particles themselves break apart at δc. At finite temperatures the quasiparticles disintegrate within a crossover range indicated by the T * line. T LFL marks the temperature below which LFL behavior is found, whereas T 0 denotes the onset temperature for initial Kondo screening.

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Effect of Ca substitution on transport and magnetic properties of double‐layered manganite La_1.2Sr_1.8Mn₂O₇

Reddy

Kumar

Rawat

et al. 2007

Physica Status Solidi (b)

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The resistivity, magnetoresistance (MR) and magnetization of double-layered manganite La 1.2 Sr 1.8-x Ca x Mn 2 O 7 (0.0 ≤ x ≤ 0.4) are studied to investigate the effect of substitution of Ca 2+ for Sr 2+ on the transport and magnetic properties. The resistivity data suggest that Ca doping results in the decrease of insulator-tometal transition temperature, T IM . The conduction mechanism above T IM is found to be of Mott variable range hopping type. The highest MR ratios (∆ρ/ρ 0 ) of 73% (H = 1.5 T) and 93% (H = 4 T) are observed for x = 0.3 sample at ~25 K. The variation of MR with temperature and applied magnetic field is discussed. A secondary transition at T * is observed in all the samples, which may be due to the twodimensional short-range ferromagnetic ordering.

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Enhancement of the anomalous Hall effect and spin glass behavior in the bilayered manganite La2−2xSr1+2xMn2O7

Cited by 5 publications

References 19 publications

The Hall effect in Ni-doped p-CdSb in a strong magnetic field

The Hall effect in Ni-doped p-CdSb in a strong magnetic field

Hall effect in heavy fermion metals

Effect of Ca substitution on transport and magnetic properties of double‐layered manganite La_1.2Sr_1.8Mn₂O₇

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Enhancement of the anomalous Hall effect and spin glass behavior in the bilayered manganite La2−2xSr1+2xMn2O7

Cited by 5 publications

References 19 publications

The Hall effect in Ni-doped p-CdSb in a strong magnetic field

The Hall effect in Ni-doped p-CdSb in a strong magnetic field

Hall effect in heavy fermion metals

Effect of Ca substitution on transport and magnetic properties of double‐layered manganite La1.2Sr1.8Mn2O7

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Product

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Effect of Ca substitution on transport and magnetic properties of double‐layered manganite La_1.2Sr_1.8Mn₂O₇