Spin susceptibility of underdoped cuprate superconductors: Insights from a stripe-ordered crystal
M. Hücker, G. D. Gu, J. M. Tranquada
DOI 10.1103/PhysRevB.78.214507 · Physical Review B
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Abstract
We report a detailed study of the temperature and magnetic-field dependence of the spin susceptibility for a single crystal of La1.875Ba0.125CuO4. From a quantitative analysis, we find that the temperature-dependent anisotropy of the susceptibility, observed in both the paramagnetic and stripe-ordered phases, directly indicates that localized Cu moments dominate the magnetic response. A field-induced spin-flop transition provides further corroboration for the role of local moments. Contrary to previous analyses of data from polycrystalline samples, we find that a commonly assumed isotropic and temperature-independent contribution from free carriers, if present, must be quite small. Our conclusion is strengthened by extending the quantitative analysis to include crystals of La2−xBaxCuO4 with x=0.095 and 0.155. On the basis of our results, we present a revised interpretation of the temperature and doping dependence of the spin susceptibility in La2−x(Sr,Ba)xCuO4.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.875Ba0.125CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | onset |
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