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We have found that the quasi-two-dimensional superconductor Sr 2 RuO 4 with the intrinsic transition temperature T c 1.5 K exhibits a remarkable enhancement in T c up to 3 K, if lamellar microdomains of ruthenium metal are embedded. Measurements of the anisotropy in the upper critical fields indicate that the 3-K superconductivity is sustained essentially in the layered structure of Sr 2 RuO 4 . We suggest that the enhanced interlayer coherence provided via metallic Ru plays a key role in the doubling of T c .[S0031-9007(98)

A miniature torquemeter for use in a pulsed magnetic field is developed by utilizing a commercially available piezoresistive microcantilever. The high sensitivity of ∼5×10−13 Am2 at 38 T is achieved. The response to faster signals were considerably improved due to high eigenfrequency of the cantilever (f∼250–300 kHz). In this article, we successfully demonstrate the magnetic torque data of samples of sub-μg order in pulsed magnetic fields up to 38 T with pulse duration of less than 60 ms. We also found that the de Haas–van Alphen data are in good agreement with the previous reports obtained in steady magnetic fields.

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