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Communication Dans Un Congrès Année : 2007

Screening of transverse ac fields and influence of supercurrent on NMR Knight shift in high-Tc crystals

Résumé

In the Nuclear Magnetic Resonance (NMR) configuration with perpendicular constant (dc) field and radiofrequency (rf) magnetic field, a strong screening supercurrent is generated by the rf field. In order to estimate this current which may influence Knight shift data, we performed a model experiment in the NMR configuration on a YBa2Cu4O8 single crystal. The differential magneto-optical imaging technique is used to determine the ac screening current distribution in the sample. We find that at T > 20 K, NMR experiments can be straightforwardly interpreted. At T < 20 K, the rf field is completely excluded. In this situation, NMR only probes the crystal edges; moreover, the Knight shift may be affected by the supercurrent flow.
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Dates et versions

hal-00142485 , version 1 (19-04-2007)

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Feng Yang, Cornelis Jacominus van Der Beek, Takasada Shibauchi, Yuji Matsuda, Bogdan Dabrowski. Screening of transverse ac fields and influence of supercurrent on NMR Knight shift in high-Tc crystals. Materials and Mechanisms of Superconductivity - High Temperature Superconductivity VIII, Jul 2006, Dresden, Germany. pp.929-930, ⟨10.1016/j.physc.2007.03.386⟩. ⟨hal-00142485⟩
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