Paramagnetic Meissner effect in HTSC

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作者：

N Knauf，W Braunisch，G Bauer，A Kock，A Becker，B Freitag，V Kataev，B Roden，DI Khomskii

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摘要：

For certain polycrystalline Bi-HTSC samples, a surprising feature was observed: instead of the usual diamagnetic response of the dc field-cooling (FC) signal, a paramagnetic moment develops below T c for fields < 1 Oe. This effect correlates with an anomaly in the low-field microwave absorption. The data are consistent with spontaneous paramagnetic moments due to spontaneous orbital supercurrents. Such currents may originate in so called π-contacts in the weak link network of polycrystalline material.

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关键词：

Experimental/ bismuth compounds calcium compounds electromagnetic wave absorption high-temperature superconductors Josephson effect magnetic moments Meissner effect paramagnetic properties of substances strontium compounds/ high temperature superconductivity Meissner effect paramagnetic moment low-field microwave absorption spontaneous orbital supercurrents weak link network Bi 2Sr 2CaCu 2O x/ A7430C Magnetic properties of superconductors A7470V Perovskite phase superconductors A7430G Superconductor response to electromagnetic fields A7450 Superconductor tunnelling phenomena, proximity effects, and Josephson effect A7460M Material effects on T c, K, critical currents in type-II superconductors / Bi2Sr2CaCu2O/ss Bi2/ss Cu2/ss Sr2/ss Bi/ss Ca/ss Cu/ss Sr/ss O/ss