Emergent transition for superconducting fluctuations in antiferromagnetic ruthenocuprates

A. C. Mclaughlin; J. P. Attfield

doi:10.1103/PhysRevB.90.220509

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Emergent transition for superconducting fluctuations in antiferromagnetic ruthenocuprates

A. C. Mclaughlin, J. P. Attfield

DOI 10.1103/PhysRevB.90.220509 · Physical Review B

T1

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Abstract

The emergence of carrier pairing from the electronically inhomogeneous phase of lightly hole-doped copper oxides has been investigated through magnetoresistance measurements on 1222-type ruthenocuprates RuSr2(R,Ce)2Cu2O10−δ, principally with R=Gd, Sm, Nd. A well-defined transition at which superconducting fluctuations emerge is discovered at a remarkably low critical doping, pc=0.0084, deep within the antiferromagnetic phase. Systematic variations of the low-temperature fluctuation density with doping and cell volume demonstrate the intrinsic nature of the electronic inhomogeneity and provide new support for bosonic models of the superconducting mechanism.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
RuSr2(R,Ce)2Cu2O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	28	Pressure not reported	onset
RuSr2Gd1.8-xY0.2CexCu2O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	27	Pressure not reported	onset
RuSr2Sm1.8-xY0.2CexCu2O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	onset