Prof. Israel Felner Profile

Prof. Israel Felner

at Hebrew Univ of Jerusalem

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Proceedings Article | 30 August 2005 Paper

On the magnetic structure of RuEu1.5Ce0.5Cu2O10 (Ru-1222)

I. Felner

Proceedings Volume 5932, 59321E (2005) https://doi.org/10.1117/12.617140

KEYWORDS: Ruthenium, Magnetism, Copper, Cerium, Strontium, Oxygen, Ions, Fermium, Frequency modulation, Europium

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Two magnetic transitions at T_M~160 K and at T_M2~80-100 K, are observed in the magneto-superconducting RuEu_2-xCe_xSr₂Cu₂O_10-δ (T_C = 32-50 K). Below T_M2, the Ru⁵⁺ moments are weakly-ferromagnetically ordered and wide ferromagnetic hysteresis loops are observed, they become narrow and disappear at ~ 60-70 K. Dc magnetic studies on c-axis oriented epitaxial thin films of Ru-1222 on (100) SrTiO₃ wafers show that the easy axis of the magnetization is in the basal plane and the Ru⁵⁺ ions are in their high-spin state. Above T_M2, (i) small antiferromagnetic-like hysteresis loops reappear with a peak in the coercive fields around 120 K. (ii) A small peak at ~120 K is also observed in the dc and ac susceptibility curves. The two phenomena are absent in the non-superconducting RuEuCeSr₂Cu₂O_10-δ (x=1) samples. Two scenarios are suggested for the phenomena at T_M2M. (i) For x<1, the decrease of the Ce⁴⁺ content, is compensated by non-homogeneous oxygen depletion, which may induce a reduction of Ru⁵⁺ ions to Ru⁴⁺. The higher ordering temperature, T_M, which does not change with x, may result from Ru⁴⁺ nano-size rich clusters, in which the Ru⁴⁺-Ru⁴⁺ exchange interactions are stronger than the Ru⁵⁺-Ru⁵⁺ interactions. Or alternatively,(ii) The presence of nanoparticles of a minor foreign extra Ru⁴⁺ magnetic phase, such as Sr-Cu-Ru-O₃, in which Cu is distributed inhomogeneously in both the Ru and Sr sites.

Proceedings Article | 7 November 2002 Paper

Coexistence of superconductivity and weak ferromagnetism in Eu2-xCexRuSr2Cu2O10-y

Israel Felner

Proceedings Volume 4811, (2002) https://doi.org/10.1117/12.466655

KEYWORDS: Cerium, Magnetism, Copper, Ruthenium, Europium, Atomic force microscopy, Superconductivity, Oxygen, Lanthanum, Superconductors

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Eu_2-xCe_xRuSr₂Cu₂O_10-δ(Ru-2122) is the first Cu-O based system in which superconductivity (SC) in the CuO₂ planes and weak-ferromagnetism (W-FM) in the Ru sublattice coexist. The hole doping in the CuO₂ planes, is controlled by appropriate variation of the Ce concentration and/or increasing the oxygen concentration. SC occurs for Ce contents of 0.4-0.8, with the highest T_C=35 K for Ce=0.6. Due to the granular nature of the materials the magneto-resistance R(H) below T_C is positive and unexpected hysteresis loops are observed. The R(H) curve on decreasing the applied field (H_ext) is much smaller than the R(H) curve for increasing (H_ext). The width of the loops depends strongly on the weak-link properties. The as-prepared non-SC EuCeRuSr₂Cu₂O₁₀ (x=1) sample exhibits magnetic irreversibility below T_irr=125 K and orders anti-ferromagnetically (AFM) at T_M =165 K. Systematic magnetic studies on Eu_2-xCe_xRuSr₂Cu2O_10-δ show that T_M, T_irr and M_sat decrease with x, and the full Ce dependent magnetic-SC phase diagram is presented. A simple model for the SC state is proposed. The interpretation of the magnetic behavior is: (i) the system becomes antiferromagnetically (AFM) ordered at T_M; (b) at T_irr < T_M, W-FM is induced by the canting of the Ru moments, and (c), at lower temperatures the appropriate samples become SC at T_C. The magnetic features are not affected by the SC state, and the two states coexist.

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