Electron spin resonance in superconducting melt-textured GdBa2Cu3O7−δ: Evidence against uniform flux entangling
H. A. Blackstead, D. B. Pulling, C. A. Clough
DOI 10.1103/PhysRevB.47.8978 · Physical Review B
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Abstract
Electron-spin-resonance measurements on melt-textured GdBa2Cu3O7−δ as a function of the angle between the rf and static magnetic fields reveal an angular-dependent response that is not consistent with recent proposals that flux entangling is responsible for isotropic or near-isotropic ab-plane resistivity or suppression of flux flow. Microwave surface-resistance data suggest near isotropy at low temperatures, while the resonance intensity varies approximately as sin2(cphi), where cphi is the angle between the static field H and Hrf with both in the ab plane; this is the dependence expected for resonance in normal materials. Uniform flux entangling would lead to an isotropic resonance intensity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| GdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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