Possible competition between superconductivity and magnetism in RuSr2Gd1.5Ce0.5Cu2O10−δ ruthenocuprate compounds

V. P. S. Awana; M. A. Ansari; Anurag Gupta; R. B. Saxena; H. Kishan; Devendra Buddhikot; S. K. Malik

doi:10.1103/PhysRevB.70.104520

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Possible competition between superconductivity and magnetism in RuSr2Gd1.5Ce0.5Cu2O10−δ ruthenocuprate compounds

V. P. S. Awana, M. A. Ansari, Anurag Gupta, R. B. Saxena, H. Kishan, Devendra Buddhikot, S. K. Malik

DOI 10.1103/PhysRevB.70.104520 · Physical Review B

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Abstract

The RuSr2Gd1.5Ce0.5Cu2O10−δ (Ru-1222) compounds, with varying oxygen content, crystallize in a tetragonal crystal structure (space group I4∕mmm). Resistance (R) versus temperature (T) measurements show that the air-annealed samples exhibit superconductivity with superconduting transition temperature (Tc) onset at around 32K and R=0 at 3.5K. On the other hand, the N2-annealed sample is semiconducting down to 2K. Magneto-transport measurements on an air-annealed sample in applied magnetic fields of 3 and 6 T (Tesla) show a decrease in both Tc onset and TR=0. Magnetoresistance of up to 20% is observed in the N2-annealed sample at 2K and 3T applied field. The dc magnetization data (M vs T) reveal magnetic transitions (Tmag) at 100K and 106K, respectively, for both air- and N2-annealed samples. Ferromagnetic components in the magnetization are observed for both samples at 5K and 20K. The superconducting transition temperature (Tc) seems to compete with the magnetic transition temperature (Tmag). Our results suggest that the magnetic ordering temperature (Tmag) of Ru moments in RuO6 octahedra may have direct influence/connection with the appearance of superconductivity in Cu−O2 planes of Ru−1222 compounds.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
RuSr2Gd1.5Ce0.5Cu2O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	Pressure not reported	onset
RuSr2Gd1.5Ce0.5Cu2O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.5	Pressure not reported	zero_resistance
RuSr2GdCu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	unknown