IN a letter in NATURE of June 22 (p. 945), reference was made to the Ehrenfest hypothesis which ascribes the high diamagnetic susceptibility of bismuth to the existence of closed electron orbits ...

The diamagnetism of the samples decreases as the fineness of the powdering is increased, and at a certain stage the sample becomes para magnetic. The paramagnetic value increases on further powdering.

The loss of superconductivity at Tc arises from the collapse of phase rigidity rather than the closing of a gap. However, its existence is betrayed by a large Nernst effect and a large orbital ...

The journey of Michael Faraday from a poor, self-taught bookbinder to the 'father of electromagnetism' has inspired ...

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