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MgB₂; low-pressure synthesis; superconductivity.

MgB₂ superconductor has been synthesized using a simple technique at ambient pressure. The synthesis was carried out in helium atmosphere over a wide range of temperatures. Magnesium was employed in excess to the stoichiometry to prevent the decomposition of MgB₂. Samples of MgB₂ thus prepared have been almost free from MgO as compared to other methods. Resistivities of the samples are quite low with residual resistivity ratio (RRR) of around 3. 𝑇_c (𝑅 = 0) is 38.2–38.5 K with 𝛥𝑇_c of 0.6–1.0 K. Comparative studies of various methods of low pressure synthesis have been presented.

A Talapatra¹ S K Bandyopadhyay¹ Pintu Sen¹ A Sarkar¹ P Barat¹

1. Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700 064, India

Published

October 2004

Manuscript received

1 April 2004