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Mandal, P.; Hassen, A.; Krimmel, A.; Loidl, A.

doi:10.1103/physrevb.65.144506

Cited by 32 publications

(30 citation statements)

References 25 publications

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“…At temperatures below 40 K the M(T) curves show an increase due to the paramagnetic contribution of the Gd ions. The Gd sublattice remains in the paramagnetic state when the Ru sublattice is ordered ferromagnetically, and orders antiferromagnetically at T N = 2.8 K [19]. However it is worth to note that in a recent study, the possibility that the net ferromagnetic moment of the Ru sublattice can induce a small component of ferromagnetic ordering at the Gd sites that would contribute to the total magnetic moment of the system [27].…”

Section: Resultsmentioning

confidence: 98%

“…Several studies of cation substitutions in the Ru-1212 compound have been reported in the literature [13][14][15][16][17][18][19][20]. Their effects in the superconducting and magnetic properties depend on the type of cation and the substitutional site.…”

Section: Introductionmentioning

confidence: 99%

“…Studies of La substitution in Sr sites [19] have been performed and the results show that T M increases slightly, but superconductivity is strongly reduced by doping, due to a hole trapping mechanism by disorder defects. Substitution of Zn in Cu sites [20], as in others high-T c cuprate superconductors, rapidly suppress the superconductivity due to pair breaking mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Study of the crystal structure, superconducting and magnetic properties of Ru_1−xFe_xSr₂GdCu₂O₈

Escamilla¹,

Morales²,

Akachi³

et al. 2005

Supercond. Sci. Technol.

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Samples of the Ru 1-x Fe x Sr 2 GdCu 2 O 8 system with x = 0, 0.025, 0.05, 0.075, 0.1, and 0.2, were prepared and their structural, superconducting and magnetic properties were studied.Rietveld refinement of the X-ray diffraction patterns show that the Fe substitution occurs in both Ru and Cu sites. An increase of Fe concentration produces no significant changes in the bond angle Ru-O(3)-Ru, which is a measure of the rotation of the RuO 6 octahedra around the c-axis, and also in the bond angle φ, (Ru-O(1)-Cu), which is a measure of the canting of the RuO 6 octahedra. On the other hand, the bond angle Cu-O(2)-Cu, which is a measure of the buckling of the CuO 2 layer, has a slight tendency to decrease with the increase of Fe content. We found that both ferromagnetic and superconducting transition temperatures are reduced with the increase of Fe concentration. Analysis related to the decay of the superconducting and ferromagnetic states is presented.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of the crystal structure, superconducting and magnetic properties of Ru_1−xFe_xSr₂GdCu₂O₈

Escamilla¹,

Morales²,

Akachi³

et al. 2005

Supercond. Sci. Technol.

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show abstract

“…However, further results from x-ray absorption [38] and NMR studies [39,40] indicated that the Ru ions appear as a mixture of 40% Ru 4+ (low-spin, S = 1) and 60% Ru 5+ (high-spin, S = 3/2), being antiferromagnetically coupled via the superexchange mechanism. The mixed valence is most likely caused by a charge transfer from the CuO2 sheets to the RuO2 layers [40,41]. Due to this mixed valence a double exchange mechanism inside the RuO2 sheets was proposed [42,43], mediated by the small canting of the Ru octahedra [44].…”

Section: Ru-1212: Electronic Properties Of the Ru Sublatticementioning

confidence: 99%

The ruthenocuprates: natural superconductor–ferromagnet multilayers

Nachtrab

Bernhard

Lin

et al. 2006

Comptes Rendus. Physique

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The recently discovered ruthenocuprates have attracted great interest because of the microscopic coexistence of superconducting and ferromagnetic order. Typically, these materials become magnetically ordered at temperatures around 125-145 K and superconductivity sets in between 15 and 50 K. While superconductivity arises in the CuO2 layers the RuO2 layers in between order magnetically. In this paper we summarize some of the crystallographic, magnetic and superconducting properties of the ruthenocuprates, as obtained from investigations on polycrystalline samples as well as single crystals. RésuméDécouverts récemment, les ruthenocuprates ont suscité un intérêténormeà cause de la coexistence d'un ordre supraconducteur et ferromagnétique. Dans ces matériaux, la phase magnétique apparaît autour de 125-145 K et la phase supraconductrice entre 15 et 50 K. Les couches de CuO2 sont supraconductrices et ce sont les couches interstitielles de RuO2 qui sont ordonnées magnétiquement. Dans cet article nous résumons quelques-unes des propriétés cristallographiques, magnétiques et supraductrices des ruthenocuprates déduites desétudes sur deś echantillons polycristallins ainsi que sur des monocristaux.

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“…In the strive to find new superconductor materials, many studies have been done in which one or more of the elements present in the different superconductor families are substituted by others. It has been found that the substitution of a fraction of the Cu atoms by other 3d-metals rapidly downgrades the T c of the RE-123 and RE-124 families, especially if the substitution takes place in the CuO 2 planes [7,[15][16][17][18][19][20], so it is important to determine where the 3d-metal atoms go to in the superconductor structure.…”

mentioning

confidence: 99%

Mössbauer study of the (Ru1-xFex)Sr2GdCu2O8-δ system and two of its possible impurities: SrRuO3 and Gd2CuO4

et al. 2006

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Mössbauer spectra of a series of samples of the weak ferromagnetic ðRu 1Àx Fe x Þ Sr 2 GdCu 2 O 8Àδ system reveal the existence of three dissimilar sites where the Fe atoms can go into the structure. The Mössbauer parameters of the three observed quadrupole doublets, together with the relative population on each site, allow the following site assignment for the iron atoms: Fe 3+ in four-fold planar coordination at Ru sites; Fe 3+ in five-fold pyramidal coordination also at Ru sites and Fe 2+ or Fe 3+ in five-fold coordination at Cu sites. This assignment implies the formation of oxygen-vacancies at the charge reservoir (the RuO 2 planes) that affect the structure and the superconducting and magnetic properties of the undoped system. Moreover, a close correlation between the oxygen content, calculated through the Mössbauer data, and the measured cell volume is established. We also report the Mössbauer spectra of two compounds (SrRu 0.95 Fe 0.05 O 3 and Gd 2 Cu 0.95 Fe 0.05 O 4 ) that could be formed as impurities during the synthesis of our samples.

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Structural, transport, and magnetic properties of pure and La-dopedRuSr2GdCu2O

Cited by 32 publications

References 25 publications

Study of the crystal structure, superconducting and magnetic properties of Ru_1−xFe_xSr₂GdCu₂O₈

Study of the crystal structure, superconducting and magnetic properties of Ru_1−xFe_xSr₂GdCu₂O₈

The ruthenocuprates: natural superconductor–ferromagnet multilayers

Mössbauer study of the (Ru1-xFex)Sr2GdCu2O8-δ system and two of its possible impurities: SrRuO3 and Gd2CuO4

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Structural, transport, and magnetic properties of pure and La-dopedRuSr2GdCu2O

Cited by 32 publications

References 25 publications

Study of the crystal structure, superconducting and magnetic properties of Ru1−xFexSr2GdCu2O8

Study of the crystal structure, superconducting and magnetic properties of Ru1−xFexSr2GdCu2O8

The ruthenocuprates: natural superconductor–ferromagnet multilayers

Mössbauer study of the (Ru1-xFex)Sr2GdCu2O8-δ system and two of its possible impurities: SrRuO3 and Gd2CuO4

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Study of the crystal structure, superconducting and magnetic properties of Ru_1−xFe_xSr₂GdCu₂O₈

Study of the crystal structure, superconducting and magnetic properties of Ru_1−xFe_xSr₂GdCu₂O₈