Lack of Evidence for Orbital-Current Effects in the High-Temperature Y2Ba4Cu7O15−δ Superconductor using Y89 Nuclear Magnetic Resonance

S. Strässle; J. Roos; M. Mali; H. Keller; T. Ohno

doi:10.1103/PhysRevLett.101.237001

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Lack of Evidence for Orbital-Current Effects in the High-Temperature Y2Ba4Cu7O15−δ Superconductor using Y89 Nuclear Magnetic Resonance

S. Strässle, J. Roos, M. Mali, H. Keller, T. Ohno

DOI 10.1103/PhysRevLett.101.237001 · Physical Review Letters

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Abstract

We have performed NMR measurements at the Y site on a c-axis-oriented powder sample of the cuprate superconductor Y2Ba4Cu7O15−δ to search for the possible orbital-current phase. The temperature dependence of the Y linewidth and relaxation behavior in the normal-conducting phase were studied down to 100 K. These measurements give upper limits for a static magnetic field and the amplitude of a fluctuating magnetic field at the Y site of ≲0.15 and ≲0.7 mT, respectively. These values provide significant constraints on possible static or quasistatic orbital currents.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Y2Ba4Cu7O15-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95	Pressure not reported	unknown