P-wave superconductivity

Spin triplet, p-wave superfluidity was discovered in He-3 a quarter of a century ago, and unconventional spin singlet d-wave superconductivity is now known to exist in the high-temperature superconducting cuprates, An established example of a spin triplet superconductor has still however, been lacking, In the past few years, evidence suggesting the existence of triplet pairing has been reported in several correlated electron compounds, with perhaps the most consistent picture emerging in the layered perovskite oxide Sr2RuO4. A brief review is given of the recent developments, stressing the important role played by high-quality samples with long mean free paths. (C) 2000 Elsevier Science B.V. All rights reserved.