Upper critical field of the magnetic superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">RuGd</mml:mi></mml:mrow><mml:mrow><mml:mn>1.4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ce</mml:mi></mml:mrow><mml:mrow><mml:mn>0.6</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:

Escote, M. T.; Meza, V. A.; Jardim, R. F.; Ben‐Dor, L.; Torikachvili, M. S.; Lacerda, A.

doi:10.1103/physrevb.66.144503

Cited by 36 publications

(41 citation statements)

References 24 publications

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“…Some of these features are described and corroborated separately [15]. [17,18]. The ρ (T) behavior of the compound is found to be semiconductor like, as expected for any other under-doped rutheno-cuprate system.…”

Section: Methodssupporting

confidence: 70%

Synthesis and physical characterization of superconductivity–magnetism crossover compound RuSr2EuCeCu2O10−δ

Awana¹,

Balamurugan²,

Chandra³

et al. 2006

Solid State Communications

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We carefully studied the nonsuperconducting sample of the magneto-superconducting RuSr 2 (Eu 1-x Ce x )Cu 2 O 10-δ series with composition RuSr 2 EuCeCu 2 O 10-δ. This compound seems to exhibit a complex magnetic state as revealed by host of techniques like resistivity, thermopower, magnetic susceptibility and MR measurements. The studied compound exhibited ferromagnetic like M(H) loops at 5, 20 and 50 K, and semiconductor like electrical conduction down to 5 K, with -MR 7Tesla of up to 4% at low temperatures.The -MR 7Tesla decreases fast above 150 K and monotonically becomes close to zero above say 230 K.Below, 150 K -MR 7Tesla decreases to around 3% monotonically down to 75 K, with further increase to 4%at around 30K and lastly having a slight decrease below this temperature. The thermopower S(T) behavior closely followed the -MR 7Tesla steps in terms of d(S/T)/dT slopes. Further, both MR 7Tesla steps and d(S/T)/dT slopes are found in close vicinity to various magnetic ordering temperatures (T mag. ) of this compound.PACS No. 74.72. Jt, 74.25. Bt, 75.80. +q

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Section: Methodssupporting

confidence: 70%

Synthesis and physical characterization of superconductivity–magnetism crossover compound RuSr2EuCeCu2O10−δ

Awana¹,

Balamurugan²,

Chandra³

et al. 2006

Solid State Communications

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“…3, which also exhibits the H c2 vs T data for the Ru-1222 for comparison. [22] The Ru 1−x Ir x Sr 2 GdCu 2 O 8 curves show the same behavior with a steeper increase at low T in samples with high Ir content. The observed features in the ρ(T) data correlate well with the magnetization data.…”

Section: Resultssupporting

confidence: 50%

Superconductivity in magnetically ordered Ru1-xIr xSr2GdCu2O8 compounds

et al. 2003

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We have performed a systematic study of the structural, transport, and magnetic properties of polycrystalline samples of the magnetic superconductors Ru1−xIrxSr2GdCu2O8; x = 0, 0.02, 0.05, 0.10, and 0.15. The samples were prepared by solid state reaction and sintered at 1060 • C for 72 h under O 2 flow. X-ray diffraction analysis shows that all samples are nearly single phase and that the lattice parameters are independent of Ir content. Transport properties measurements revealed that the Ru substitution by Ir results in a decrease of Tc,onset from ∼ 50 K (x = 0) to ∼ 30 K (x = 0.10). Further addition of Ir (x > 0.10) causes an evolution from metallic to nonmetallic behavior of ρ(T). We have also found that magnetic order develops in the undoped Ru-1212 materials near T M ∼ 130 K. This temperature decreases linearly with increasing Ir content at the rate of ∼ -1.6 K / Ir at.%, suggesting that Ir effectively substitutes Ru in the RuO planes. A subtle drop in ρ(T) is observed close to T M , probably due to the suppression of the spin-flip scattering. The magnetoresistivity measurements revealed that the temperature T c,zero , in which ρ(T) ∼ 0, decreases rapidly for low applied magnetic fields (H < 2 T), and that this drop becomes much less pronounced in higher magnetic fields (2 ≤ H ≤ 18 T). The appreciable broadening of ρ(T) curves at low magnetic fields is reminiscent of the behavior in high-T c materials showing granular behavior, as for example in Sm1.85Ce0.15CuO4−y.

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“…Also, values comparable with the one obtained for the sample P5 have been estimated in other High-T c materials as λ tr = 0.1 -0.6 in Y-123, [7,23,24] λ tr ∼ 0.3 in LaSrCuO, [7] and λ tr ∼ 0.17 in Ru-1222. [25] Values of λ tr in this range indicate a weak electron-phonon interaction in Bi-2223.…”

Section: Discussionmentioning

confidence: 92%

Normal-state properties of uniaxially pressed Bi1.65Pb0.35Sr2Ca2Cu3O10+delta ceramics

2005

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We have studied the effects of the uniaxial compacting pressure on the physical properties of polycrystalline Bi 1.65 Pb 0.35 Sr 2 Ca 2 Cu 3 O 10+δ (Bi-2223) superconductors. Powders of this material were pressed at different uniaxial compacting pressures ranging from ∼ 90 to ∼ 600 MPa and heat-treated at the same temperature. A characterization of samples by using Scanning Electron Microscopy and X-ray diffractometry indicated an appreciable improvement of the degree of texture with increasing pressure. The temperature dependence of the electrical resistivity ρ(T) exhibits a T -linear behavior at temperatures higher than T * ∼ 235 K. The deviation of ρ(T) from the linear behavior below T * indicates the opening of the pseudogap, a feature confirmed by magnetic susceptibility measurements performed in powder samples. From linear fittings of the normal-state electrical resistivity we were able to separate contributions to ρ(T) arising from both the grain misalignment and microstructural defects. The results suggest that the grain orientation and the connectivity between them are improved with increasing compacting pressure. Also, based on the linearity of the electrical resistivity data both the transport electron-phonon coupling constant, λ tr , and the mean free path, l, were estimated. We have found that in the sample with the highest degree of texture λ tr ∼ 0.53, a value comparable with the one obtained in Bi-2223 single crystals. However, the result for l ∼ 12.7Å at 300 K, in the same ceramic sample, is close to 3 times lower than the single crystal value. The influence of the intergranular electrical resistivity in determining band-theory parameters was analyzed within the framework of a current conduction model for granular superconducting materials.

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Upper critical field of the magnetic superconductorRuGd1.4Ce0.6Sr

Cited by 36 publications

References 24 publications

Synthesis and physical characterization of superconductivity–magnetism crossover compound RuSr2EuCeCu2O10−δ

Synthesis and physical characterization of superconductivity–magnetism crossover compound RuSr2EuCeCu2O10−δ

Superconductivity in magnetically ordered Ru1-xIr xSr2GdCu2O8 compounds

Normal-state properties of uniaxially pressed Bi1.65Pb0.35Sr2Ca2Cu3O10+delta ceramics

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