p-wave superconductivity

Spin triplet, p-wave superfluidity was discovered in He-3 a quarter of a ce ntury ago, and unconventional spin singlet d-wave superconductivity is now known to exist in the high-temperature superconducting cuprates, An establi shed example of a spin triplet superconductor has still however, been lacki ng, In the past few years, evidence suggesting the existence of triplet pai ring has been reported in several correlated electron compounds, with perha ps the most consistent picture emerging in the layered perovskite oxide Sr2 RuO4. A brief review is given of the recent developments, stressing the imp ortant role played by high-quality samples with long mean free paths. (C) 2 000 Elsevier Science B.V. All rights reserved.