Experimental study of the magnetosuperconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ru</mml:mi><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Eu</mml:mi><mml:mn>1.5</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ce</mml:mi><mml:mn>0.5</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi ma

Awana, V. P. S.; Lal, R. B.; Kishan, H.; Narlikar, A. V.; Peurla, Markus; Laiho, R.

doi:10.1103/physrevb.73.014517

Cited by 14 publications

(14 citation statements)

References 28 publications

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“…A phenomenological theoretical approach to explain this competing behavior is underway. 12 In conclusion, it is shown that substitution of both Co and Mo at Ru-site in RuSr 2 Eu 1.5 Ce 0.5 Cu 2 O 10−δ system takes place iso-structurally in tetragonal structure (space group I4/mmm) with full solubility. With progressive Co substitution at Ru-site both T c (R = 0) and T dia c decrease monotonically and SC is not observed above 7.5% doping level.…”

Section: Resultsmentioning

confidence: 76%

IMPACT OF Co AND Mo SUBSTITUTION AT Ru-SITE IN RuSr₂Eu_1.5Ce_0.5Cu₂O_10-δ MAGNETO-SUPERCONDUCTOR

et al. 2006

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Substitution of both Co and Mo at Ru-site in RuSr 2 Eu 1.5 Ce 0.5 Cu 2 O 10−δ system takes place iso-structurally in tetragonal structure (space group I4/mmm) with full solubility. The resistance versus temperature (R versus T ) behavior of the pristine sample confirmed superconductivity (T R=0 c ) around 25 K. The DC magnetization data (M versus T ) for the same sample revealed magnetic transition (Tmag) at 140 K followed by superconducting transition (T dia c ) at 32 K. With progressive Co substitution at Ru-site both T R=0 c and T dia c decrease monotonically and superconductivity is not observed for x ≥ 0.10 (10 at%). The magnetic behavior of materials with Co up to x = 0.2 preserves the magnetic structure of the parent RuSr 2 Eu 1.5 Ce 0.5 Cu 2 O 10−δ compound. For 0.8 ≥ x ≥ 0.2 a clear antiferromagnetic transition at T N = 31 K is observed regardless of Co content. In the case of Mo-doped ruthenocuprates Ru 1−x MoxSr 2 Eu 1.5 Ce 0.5 Cu 2 O 10−δ , it has been found that the magnetic transition temperature decreases with x. The samples of x = 0.8 and 1.0 are found to have no magnetic or superconducting effects. The values of the superconducting transition temperature obtained from the resistivity versus temperature data increase by 4.5 and 7.0 K for x = 0.2 and 0.4 respectively, and then decrease by 17 K for x = 0.6. The observed variation of Tc with x in case of Mo has been explained in terms of a theory which combines the effects of weakening magnetic behavior and reducing carrier concentration in a phenomenological manner.

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Section: Resultsmentioning

confidence: 76%

IMPACT OF Co AND Mo SUBSTITUTION AT Ru-SITE IN RuSr₂Eu_1.5Ce_0.5Cu₂O_10-δ MAGNETO-SUPERCONDUCTOR

et al. 2006

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“…이들 자성 초전도체의 구성은 일반적으로 RuSr2(R2-yCey)Cu2O10(Ru-1222) 및 RuSr2RCu2O10(Ru-1212) 로 나타낼 수 있으며, R 은 희토류 원소로서 Sm, Eu 및 Gd 의 경우만 상압에서 단 일상이 형성됨이 알려져 왔다 [4]. 특히 Ru-1222 계는 Ru-1212 계에 비해 강자성 특성이 크게 관측되어 [5] 그 원인을 파악하기 위해 많은 치환연구가 수행되어 왔 으며, (Ru1-xMx)Sr2(R2-yCey)Cu2O10((Ru,M)-1222) 조성에 대한 연구에서 M = Fe [6], Co [7], Nb [8,9], Mo [10], Sn [11], Sb [12] …”

Section: 서 론unclassified

Superconductivty and magnetic properties of <TEX>$(Ru_{1-x}Nb_x)Sr_2(Sm_{1.4}Ce_{0.6})Cu_2O_z$</TEX>

Lee¹,

Bae²,

Lee³

2013

Progress in Superconductivity and Cryogenics

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We investigated the effect of Nb substitution for Ru on the structural and magnetic properties of (Ru 1-x Nb x ) Sr 2 (Sm 1.4 Ce 0.6 )Cu 2 O z Samples. X-ray diffraction measurements indicated that nearly single-phase samples are formed in the range from x = 0 to 1.0. The superconducting transition temperature determined from the inflection in the field-cooled magnetic susceptibility decreased only slightly from T c = 25 K for x = 0 to T c = 22 K for x = 1.0, in consistent with the change in room temperature thermopower of the samples. However, the Nb substitution for Ru above x = 0.25 significantly suppressed the weak ferromagnetic component of the field-cooled magnetic susceptibility. It was also found that the Nb substitution for Ru results in an enhanced diamagnetic susceptibility with Nb content above x = 0.5 in both zero field-cooled and field-cooled magnetization measurements, in contrast to the behavior of the samples with x ≤ 0.5 in which the diamagnetic susceptibility decreases as the Nb content increases.

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“…It is possible to control relevant parameters that affect the superconducting properties of the sample by studying chemically altered compounds, with proper chemical substitutions, and thus it is possible to obtain a better understanding on the mechanisms of superconductivity. Specially, substitutions in the Ru site can be used to investigate superconductivity, for example, Mo [15], Co [16], Sn [17], Sb [18], and Pb [19] substitutions affect the carrier density in the CuO 2 planes. Nb substitution for Ru is more interesting because Nb is a nonmagnetic ion, and both Nb and Ru ions have valence close to 5 + , and changes in the carrier density should be smaller than in previous examples.…”

Section: Introductionmentioning

confidence: 99%

Nb Substitution Effects on Superconducting Properties ofRu_1−xNb_xSr₂Eu_1.4Ce_0.6Cu₂O_10−δ

Maldonado-Mejía

Quiz-Celestino

Botello-Zubiate

et al. 2013

Advances in Condensed Matter Physics

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In order to gain further insight into the role of substitution of Ru by Nb on superconductivity, polycrystalline samples of Ru1−xNbxSr2Eu1.4Ce0.6Cu2O10−δ (0.0 ≤x≤ 1.0) have been synthesized by solid-state reaction method. Substitution of Nb at the Ru site in the system takes place isostructurally in the tetragonal structure (space groupI4/mmm) with full solubility (x= 1.0). Superconductivity exists for all compositions. Resistivity measurements in function of temperature from 0 to 300 K were done using the four-probe technique. It is found that the substitution of Ru5+for Nb5+depresses the superconductivity of samples fromTc = 29 K forx= 0.0 toTc = 5 K forx= 1.0 (whereTcis the critical temperature, when resistivity becomes equal to zero). In the normal state, the dependence of resistivity with temperature, for compositions withx = 0.0 and 0.2, shows a metallic behavior, while for compositions betweenx= 0.4 andx= 1 it shows a semiconducting behavior. In that way, the density of charge carriers is reduced with niobium doping, leading to the semiconducting behavior. The resistive transition to the superconducting state of all samples is found to be affected by granularity. Samples undergo double superconducting transition.

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Experimental study of the magnetosuperconductorRuSr2Eu1.5Ce0.5Cu2

Abstract: has been explained in terms of a theory which combines the effects of weakening magnetic behavior and reducing carrier concentration in a phenomenological manner. The resulting theory is found to provide a good agreement with the observed value of T c .

Cited by 14 publications

References 28 publications

IMPACT OF Co AND Mo SUBSTITUTION AT Ru-SITE IN RuSr₂Eu_1.5Ce_0.5Cu₂O_10-δ MAGNETO-SUPERCONDUCTOR

IMPACT OF Co AND Mo SUBSTITUTION AT Ru-SITE IN RuSr₂Eu_1.5Ce_0.5Cu₂O_10-δ MAGNETO-SUPERCONDUCTOR

Superconductivty and magnetic properties of <TEX>$(Ru_{1-x}Nb_x)Sr_2(Sm_{1.4}Ce_{0.6})Cu_2O_z$</TEX>

Nb Substitution Effects on Superconducting Properties ofRu_1−xNb_xSr₂Eu_1.4Ce_0.6Cu₂O_10−δ

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Experimental study of the magnetosuperconductorRuSr2Eu1.5Ce0.5Cu2

Abstract: has been explained in terms of a theory which combines the effects of weakening magnetic behavior and reducing carrier concentration in a phenomenological manner. The resulting theory is found to provide a good agreement with the observed value of T c .

Cited by 14 publications

References 28 publications

IMPACT OF Co AND Mo SUBSTITUTION AT Ru-SITE IN RuSr2Eu1.5Ce0.5Cu2O10-δ MAGNETO-SUPERCONDUCTOR

IMPACT OF Co AND Mo SUBSTITUTION AT Ru-SITE IN RuSr2Eu1.5Ce0.5Cu2O10-δ MAGNETO-SUPERCONDUCTOR

Superconductivty and magnetic properties of <TEX>$(Ru_{1-x}Nb_x)Sr_2(Sm_{1.4}Ce_{0.6})Cu_2O_z$</TEX>

Nb Substitution Effects on Superconducting Properties ofRu1−xNbxSr2Eu1.4Ce0.6Cu2O10−δ

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IMPACT OF Co AND Mo SUBSTITUTION AT Ru-SITE IN RuSr₂Eu_1.5Ce_0.5Cu₂O_10-δ MAGNETO-SUPERCONDUCTOR

IMPACT OF Co AND Mo SUBSTITUTION AT Ru-SITE IN RuSr₂Eu_1.5Ce_0.5Cu₂O_10-δ MAGNETO-SUPERCONDUCTOR

Nb Substitution Effects on Superconducting Properties ofRu_1−xNb_xSr₂Eu_1.4Ce_0.6Cu₂O_10−δ