Superconductivity and anomalous magnetic properties of the double-doping La1.85−2xSr0.15+2xCu1−xRuxO4 (0⩽x⩽0.3) compounds

Jing Xie; Jiyu Fan; Shun Tan; Yuheng Zhang

doi:10.1103/PhysRevB.73.174515

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Superconductivity and anomalous magnetic properties of the double-doping La1.85−2xSr0.15+2xCu1−xRuxO4 (0⩽x⩽0.3) compounds

Jing Xie, Jiyu Fan, Shun Tan, Yuheng Zhang

DOI 10.1103/PhysRevB.73.174515 · Physical Review B

T1

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Abstract

The effect of Ru4+ substitution for Cu2+ in the double-doped La1.85−2xSr0.15+2xCu1−xRuxO4 (0⩽x⩽0.30) samples have been investigated by means of IR, Raman, the temperature dependence of resistivity, and magnetization under field cooling and zero field cooling. It is surprisingly found that the critical dopant level is higher than that by the single-doping method; even up to x=0.3, it is still pure phase because the valence unbalance has been compensated through the double-doping method. With Ru4+ doping, the evolution of IR and Raman spectra are correspondent with the anomalous magnetic properties. The superconductive transition survives until x=0.03, and there exists spin glass freezing in 0.04⩽x⩽0.06 samples, the cluster glass state in 0.08⩽x⩽0.175 samples, and the imperfect long range antiferromagnetic state in 0.20⩽x⩽0.30 samples. The origin of the suppressing superconductivity is ascribed to the localization of hole carriers in the Cu-O planes caused by Ru4+ ions rather than their spins.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37	Pressure not reported	onset
La1.83Sr0.17Cu0.99Ru0.01O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	onset
La1.79Sr0.21Cu0.97Ru0.03O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	onset
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown