Abstract
Muon spin relaxation measurements in iron-oxypnictide systems have revealed: (1) commensurate long-range order in undoped LaFeAsO; (2) a Bessel function line shape in which indicates possible incommensurate or stripe magnetism; (3) anomalous weak magnetism existing in superconducting LaFePO, , and but absent in superconducting ; and (4) scaling of the superfluid density with in the Ce-, La-, and Nd-FeAs superconductors following a nearly linear relationship found in cuprates.
- Received 14 May 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.087001
©2009 American Physical Society