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.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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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).
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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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.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
User Contributions:
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