Ruthenium-based layered cuprates RuSr2LnCu2O8 and RuSr2(Ln1+xCe1−x)Cu2O10 (LnSm, Eu and Gd)

Bauernfeind, L.; Widder, W.; Braun, H. F.

doi:10.1016/0921-4534(95)00574-9

Cited by 438 publications

(237 citation statements)

References 26 publications

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“…Both ruthenium copper oxides were synthesized and studied for their transport propert ies already in 1995 [6] , but magnetic characterization had not been carried out until recently [1][2][3][4][5]. Both Ru-1222 and Ru-1212 phases are structurally related to the In the Ru-1222 structure furthermore, a three-layer fluorite-type block instead of a single oxygen-free R (= rare earth element) layer is inserted between the two CuO2 planes of the Cu-1212 structure [7].…”

Section: Introductionmentioning

confidence: 99%

Magneto-superconductivity of 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10−δ

Awana

Takayama‐Muromachi

Karppinen

et al. 2003

Physica C: Superconductivity

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Section: Introductionmentioning

confidence: 99%

Magneto-superconductivity of 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10−δ

Awana

Takayama‐Muromachi

Karppinen

et al. 2003

Physica C: Superconductivity

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“…Our earlier studies indicate that Dy substitution at (Ln,Ce)O 2 site affects both the superconducting and magnetic transition temperatures [6]. It is known from literature that among Gd 2-x Ce x Sr 2 RuCu 2 O 10 the compound with composition Gd 1.4 Ce 0.6 Sr 2 RuCu 2 O 10 shows the highest of T c [7] . It is also known that the T c and the broadening of transition depends on the synthesis route namely, the compounds synthesized at high pressure oxygen environment show better properties [8] in terms of T c , H c2 and so on in comparison with the ambient pressure oxygen annealed samples.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mn substitution on the delicate balance between structure and properties of Gd1.4Ce0.6Sr2RuCu2O10

Kalavathi

Janaki

Sairam

et al. 2006

Solid State Communications

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Some new members of a Ruthenocuprate (2212) series have been synthesized by Mn substitution for Ru in Gd 1.4C e0.6Sr2RuCu2O10 . Characterisation by XRD phase analysis followed by Rietveld refinement has been carried out. IR spectroscopy studies and Rietveld refinements are consistent with substitution of Mn at Ru site. XRD studies indicate changes in structural features on substitution including a significant change in lattice parameter for a very low substitution level (1mole% of Ru). The pristine compound shows coexistence of superconductivity and magnetism. Four probe resistivity studies indicate a semiconductor like upturn in resistivity and absence of superconductivity even for Mn substitution levels as low as 1 mole%. a. c. susceptibility measurements show a progressive suppression of the magnetic transition temperature as well as a smearing of the magnetic transition as a function of Mn substitution. Possible reasons for absence of superconductivity have been discussed.

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“…[5] Heat capacity measurements and diamagnetic shielding fraction data indicate that SC is a bulk property, coexisting in a microscopic scale with magnetism in these materials. [6,7] The crystal structure of the RuSr 2 LnCu 2 O 8 compound (Ru-1212) is closely related to the one of the LnBa 2 Cu 3 O 7 (Ln-123), [1] in which the intermediate layer consists of vertex sharing RuO 6 octahedra replacing the CuO 4 squares of the Ln-123 structure. [4,5] The coexistence of SC and FM can be sustained possibly because of the weak coupling between the Ru-O magnetically ordered layers and the SC Cu-O planes.…”

Section: Introductionmentioning

confidence: 99%

“…[1,2] The interest in these materials was triggered by the observation of coexisting superconductivity (SC) and long-range magnetic order, including weak-ferromagnetism (wFM), at moderately high temperatures (T). [3,4] The occurrence of long-range magnetic order has been determined by means of magnetic susceptibility, and muon spin relaxation, while details of the magnetic and crystal structure have been studied by neutron diffraction.…”

Section: Introductionmentioning

confidence: 99%

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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Ruthenium-based layered cuprates RuSr2LnCu2O8 and RuSr2(Ln1+xCe1−x)Cu2O10 (LnSm, Eu and Gd)

Cited by 438 publications

References 26 publications

Magneto-superconductivity of 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10−δ

Magneto-superconductivity of 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10−δ

Effect of Mn substitution on the delicate balance between structure and properties of Gd1.4Ce0.6Sr2RuCu2O10

Superconductivity in magnetically ordered Ru1-xIr xSr2GdCu2O8 compounds

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