Spin-triplet superconductivity in Sr(sub2)RuO(sub4) identified by (super17)O Knight shift

Article Abstract:

The discovery of unconventional superconducting materials such as heavy-fermion, organic and the high-transition-temperature copper oxide superconductors has challenged superconductivity. The only known spin-triplet superconductor is the heavy-fermion compound UPt(sub3). The spin state of Cooper pairs can be identified from measurements of their spin susceptibility, determined by the Knight shift. Knight-shift measurements of Sr(sub2)RuO(sub2) have been made using (super17)O NMR, and no change in spin susceptibility when passing through the superconducting transition temperature was found.

Usage, Observations, Superconductivity, Nuclear magnetic resonance, Cooper pairs

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Electrostatically driven charge-ordering in Fe(sub2)OBO

Article Abstract:

The phenomenon of charge-ordering is important in conducting metal oxides, resulting in metal-insulator transitions in manganite perovskites. Charge-ordered stripes are seen in certain manganites and copper superconductors. The issue of whether charge-ordering in oxides is fuelled by electrostatic repulsions or by strains coming from electron-lattice interactions, is unresolved. The electrostatic repulsion charge-ordering mechanism is supported following measurements on iron oxoborate, FE(sub2)OBO(sub3).

Metallic oxides, Metal oxides, Perovskite

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Cation effects in doped La(sub2)CuO(sub4) superconductors

Article Abstract:

The critical temperatures of (Ln(sub1-x)Mx)(sub2)CuO(sub4) superconductors where Ln(super3+) and M(super2+) cations are distributed randomly amongst type A lattices, are dependent on the doping level x and the mean A-site cation radius (rA). It is shown that the critical temperature reduces linearly with rising A-site disorder. This illustrates that the critical temperature should rise quadratically with (rA), in the absence of disorder, for superconductors having a single CuO(sub2) layer.

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