Electrical resistivity of doped EuB6 down to 50 mK

Baťko, I.; Baťková, M.; Flachbart, К.; Macko, D.; Konovalova, E.S.; Paderno, Yu. B.

doi:10.1016/0304-8853(94)00761-6

Cited by 9 publications

(15 citation statements)

References 4 publications

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“…Electric, magnetic, and heat capacity studies of EuB 5.99 C 0.01 support the hypothesis that the dominant scattering process in this material at temperatures below the bulk magnetic transition, T C = 4.3 K [14], has its origin in the mixed magnetic structure [13,14,15]. The anomalous transport properties of the EuB 5.99 C 0.01 can be satisfactorily explained assuming the presence of MPs [14].…”

Section: Introductionsupporting

confidence: 56%

Evidence for magnetic phase separation in colossal magnetoresistance compound EuB5.99C0.01

Baťko

Baťková

Tran

et al. 2014

Solid State Communications

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EuB 5.99 C 0.01 is a low-carrier density ferromagnet that is believed to be intrinsically inhomogeneous due to fluctuations of carbon content. In accordance with our previous studies, electric trasport of EuB 5.99 C 0.01 close above temperature of the bulk ferromagnetic (FM) ordering is governed by magnetic polarons. Carbon-rich regions are incompatible with FM phase and therefore they act as spacers preventing magnetic polarons to link, to form FM clusters, and eventually to percolate and establish a (homogoneous) bulk FM state in this compound, what consequently causes additional (magneto)resistance increase. Below the temperature of the bulk FM ordering, carbon-rich regions give rise to helimagnetic domains, which are responsible for an additional scattering term in the electrical resistivity. Unfortunately, there has not been provided any direct evidence for magnetic phase separation in EuB 5.99 C 0.01 yet. Here reported results of electrical, heat capacity, Hall resistivity and small-angle neutron scattering studies bring evidence for formation of mixed magnetic structure, and provide consistent support for the previously proposed scenario of the magnetoresistance enhancement in EuB 5.99 C 0.01 .

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Section: Introductionsupporting

confidence: 56%

Evidence for magnetic phase separation in colossal magnetoresistance compound EuB5.99C0.01

Baťko

Baťková

Tran

et al. 2014

Solid State Communications

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“…Different types of magnetic order are a consequence of a distinct impact of the RKKY interaction due to distinct carrier densities [15]. The presence of the helimagnetic domains is also believed to be responsible for an additional scattering term in the electrical resistivity below the bulk FM phase transition [1,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of pressure on the electric transport properties of carbon-doped

Baťková

Baťko

Bauer

et al. 2010

Solid State Communications

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We report about influence of external pressure on electrical resistivity of EuB 5.99 C 0.01 , the compound believed to be intrinsically inhomogeneous due to fluctuation of carbon content. Our results show that the low-temperature resistivity maximum shifts to lower temperature with applied pressure, opposite to the behavior reported for stoichiometric EuB 6. The origin of such qualitative difference we associate with the increasing volume fraction of the phase that is not compatible with ferromagnetic ordering (originating in regions with relatively higher carbon concentration) with enhancing pressure. Our results support a recent proposition [1] that carbon-rich regions strongly influence magnetotransport properties of carbon-doped EuB 6 , such as they play a role of "spacers", which prevent percolation of ferromagnetic phase.

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“…Our studies have revealed that the behaviour of this system can be attributed to the effect of fluctuations in carbon concentration. According to our observations, in the bulk ferromagnetic state, carbon--rich regions give rise to helimagnetic domains that are responsible for an additional scattering term in the electrical resistivity [3][4][5]. Above the temperature of the bulk ferromagnetic ordering, T C = 4.3 K, the carbon-rich regions act as spacers that prevent magnetic polarons to link, to form ferromagnetic clusters, and eventually to percolate.…”

Section: Introductionmentioning

confidence: 58%

“…Not long ago we dealt with the ferromagnetic EuB 5.99 C 0.01 [3,4] exhibiting anomalously large negative magnetoresistance. Our studies have revealed that the behaviour of this system can be attributed to the effect of fluctuations in carbon concentration.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Transport Properties of Carbon-Doped EuB₆

et al. 2010

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In the presented work we report electrical, magnetic and thermal properties of EuB 6−x C x single crystals with an estimated value of x ≈ 0.07. Our studies reveal an antiferromagnetic phase transition at T N ≈ 6.7 K. Electrical resistivity at zero magnetic field shows a pronounced resistivity maximum at T M ≈ 7 K, just above the antiferromagnetic phase transition temperature. With increasing applied magnetic field the maximum moves to lower temperature and becomes totally suppressed at the field of 9 T. Observed magnetoresistance is negative in the whole studied temperature range 2-20 K, yielding a ratio of ρ(0 T, 7 K)/ρ(9 T, 7 K) ≈ 2.5. The origin of such magnetoresistance is associated with formation of mixed magnetic structure in the system due to fluctuation of carbon concentration.

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Electrical resistivity of doped EuB6 down to 50 mK

Cited by 9 publications

References 4 publications

Evidence for magnetic phase separation in colossal magnetoresistance compound EuB5.99C0.01

Evidence for magnetic phase separation in colossal magnetoresistance compound EuB5.99C0.01

Effect of pressure on the electric transport properties of carbon-doped

Anomalous Transport Properties of Carbon-Doped EuB₆

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Electrical resistivity of doped EuB6 down to 50 mK

Cited by 9 publications

References 4 publications

Evidence for magnetic phase separation in colossal magnetoresistance compound EuB5.99C0.01

Evidence for magnetic phase separation in colossal magnetoresistance compound EuB5.99C0.01

Effect of pressure on the electric transport properties of carbon-doped

Anomalous Transport Properties of Carbon-Doped EuB6

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Product

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Anomalous Transport Properties of Carbon-Doped EuB₆