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Direct observation of multiple spin zeroes in the underdoped high temperature superconductor YBa2Cu3O6+x

By Suchitra E. Sebastian, N. Harrison, M. M. Altarawneh, F. F. Balakirev, C. H. Mielke, Ruixing Liang, D. A. Bonn, W. N. Hardy and G. G. Lonzarich


We report the direct observation of multiple `spin zeroes' in angle-dependent magnetic quantum oscillations measured up to 85T in YBa2Cu3O6+x, at which the amplitude falls to a deep minimum accompanied by a phase inversion of the measured quantum oscillations, enabling the product of the effective mass and effective g-factor m*g* to be tightly constrained. We find an evolution of the location of the spin zeros with applied magnetic field, and suggest that this effect and the absence of a spin zero at low angles can be produced by more than one Fermi surface component, and an effective g-factor with a subtle anisotropy between in-plane and out-of-plane crystalline directions.Comment: 4 pages, 4 figure

Topics: Condensed Matter - Superconductivity
Year: 2011
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