Interplay of structure and magnetism in ruthenocuprates: a Raman scattering and dilatometry study

Fainstein, A.; Ramos, C.A.; Pregliasco, R. G.; Butera, A.; Trodahl, H. J.; Williams, G. V. M.; Tallon, J. L.

doi:10.1016/s0921-4526(02)00727-5

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…In the magnetization M-applied field H curve shown in figure 1(b), a slight hysteresis cycle is observed, even at 100 K, as definite as at 5 K. The magnetization at 5 K is not saturated at 5 T, which is similar to SrRuO 3 [9] but contrasts with Sr 3 Ru 2 O 7 , which has a saturation field at as low as 0.2 T [7]. These behaviours typical for the superconducting Ru-1212 compounds [12][13][14][15][16][17][18][19][20][21] are also observed here.…”

Section: Resultsmentioning

confidence: 99%

“…The Ru-1212 compound contains Ru 5+ with a 4d 3 configuration instead of the 4d 4 of the Sr n+1 Ru n O 3n+1 compounds [13]. Well oxidized samples display coexisting ferromagnetism and superconductivity [12][13][14][15][16][17][18][19][20][21]. In this study, we have investigated the magnetic and the magneto-transport properties of the nonsuperconducting Ru-1212 compounds with its characteristic low-dimensional structure and electronic configuration.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and magneto-transport properties of RuSr₂GdCu₂O₈

Matsubara

Kida

Funahashi

2001

J. Phys.: Condens. Matter

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We have investigated the magnetic and the magneto-transport properties of non-superconducting RuSr2GdCu2O8 (Ru-1212). The Ru sublattice shows a magnetic ordering at Tc = 148 K. An antiferromagnetic ordering of the Gd sublattice is clearly observed at 2.8 K. The ρ-T behaviour is semiconducting with a kink in the vicinity of the Tc due to the reduction of spin scattering. Negative magnetoresistance due to a suppression of spin-flip scattering is relatively large, ~4% at H = 4 T, even in the highly two-dimensional system.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic and magneto-transport properties of RuSr₂GdCu₂O₈

Matsubara

Kida

Funahashi

2001

J. Phys.: Condens. Matter

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“…In the first term the Curie constant C Gd was taken as the theoretical value of 7.9 emu K mol −1 and the Curie temperature as Gd = −9 K. This value for Gd was used by Butera et al [23,24], and was obtained performing EPR measurements. In the second term we included the Curie constant C Ru , the Curie temperature ( Ru ), and the susceptibility χ 0 which is temperature independent because of the nonlinearity of the inverse susceptibility data in the measured range (170-300 K) as seen in figure 7.…”

Section: Resultsmentioning

confidence: 99%

Structural analysis, magnetic and transport properties of the (Ru_1−xCo_x)Sr₂GdCu₂O₈system

Escamilla¹,

Durán²,

Escudero³

2005

Supercond. Sci. Technol.

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The effects of Co substitution on the structural and superconducting properties of the RuSr 2 GdCu 2 O 8 compound have been studied. Rietveld refinements of the x-ray diffraction patterns indicate that the cobalt ion progressively replaces ruthenium sites. This replacement induces significant changes on the crystal structure and on the magnetic and superconducting properties. The effects of Co substitution on the superconducting behaviour, and more particularly on the changes induced by the hole doping mechanism, were investigated in (Ru 1−x Co x )Sr 2 GdCu 2 O 8 by a 'bond valence sum' analysis with Co content from x = 0.0 to 0.2. The weak ferromagnetic transition at T M = 138.2 K is shifted to lower temperature, and suppressed at higher Co content. From the crystallographic point of view the Ru-O(1)-Cu bond angle, associated to the rotation of the RuO 6 octahedra around the c-axis, remains essentially constant when Ru is substituted by Co. Furthermore, increasing Co content has the effect of increasing the weak ferromagnetic moment, which may be interpreted as the main feature responsible for breaking the delicate balance between magnetic and superconducting ordering.

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“…We know from the structural studies [7,8] that the O-Cu-O buckling angle decreases with temperature, leading to a shortening of the Cu-O Cu bond length. A contraction of the lattice associated with the magnetic transition has been observed in the dilatometric measurements by Fainstein et al [22]. While this may account for the hardening of the mode, since the increased hardening of the planar oxygen mode is occurring approximately below the magnetic transition temperature, we have fitted these data using an additional term similar to the one used for the spin-phonon interaction of the ruthenium mode.…”

Section: Infrared Absorption Measurements On Gdsrmentioning

confidence: 90%

Temperature and composition dependence of phonon modes in GdSr₂Ru_1 xCu_2+xO₈

Sairam

Premila

Janaki

et al. 2004

J. Phys.: Condens. Matter

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Low temperature infrared absorption measurements have been carried out on GdSr 2 RuCu 2 O 8 between 300 and 10 K. With the lowering of temperature, below the magnetic transition temperature, T M , the modes corresponding to vibrations of ruthenium and planar oxygen atoms are observed to harden significantly, over and above that determined by anharmonicity, and this is attributed to the spinphonon interaction. The mode corresponding to the vibrations of the apical oxygen has an asymmetric (Fano) lineshape, and the asymmetry parameter is seen to decrease sharply below T M , and a similar behaviour is also seen for Cu-doped GdSr 2 Ru 1−x Cu 2+x O 8 (x = 0.0-0.20). This has been understood in terms of the coupling of this phonon mode with the charge carriers. A plot of the phonon linewidth with the square of the Fano asymmetry parameter shows a linear correlation, with a slope dependent on the density of carriers. This slope and the mode frequencies of the various Cu doped samples are seen to correlate with the observed non-monotonic variation of T c with Cu content with a maximum for x = 0.1.

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Interplay of structure and magnetism in ruthenocuprates: a Raman scattering and dilatometry study

Cited by 4 publications

References 8 publications

Magnetic and magneto-transport properties of RuSr₂GdCu₂O₈

Magnetic and magneto-transport properties of RuSr₂GdCu₂O₈

Structural analysis, magnetic and transport properties of the (Ru_1−xCo_x)Sr₂GdCu₂O₈system

Temperature and composition dependence of phonon modes in GdSr₂Ru_1 xCu_2+xO₈

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Interplay of structure and magnetism in ruthenocuprates: a Raman scattering and dilatometry study

Cited by 4 publications

References 8 publications

Magnetic and magneto-transport properties of RuSr2GdCu2O8

Magnetic and magneto-transport properties of RuSr2GdCu2O8

Structural analysis, magnetic and transport properties of the (Ru1−xCox)Sr2GdCu2O8system

Temperature and composition dependence of phonon modes in GdSr2Ru1 xCu2+xO8

Contact Info

Product

Resources

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Magnetic and magneto-transport properties of RuSr₂GdCu₂O₈

Magnetic and magneto-transport properties of RuSr₂GdCu₂O₈

Structural analysis, magnetic and transport properties of the (Ru_1−xCo_x)Sr₂GdCu₂O₈system

Temperature and composition dependence of phonon modes in GdSr₂Ru_1 xCu_2+xO₈