Positive muon sites and possibility of anyons in the YBa2Cu3Ox system

Possible positive muon sites in YBa2Cu3Ox were determined from the observed μ+ hyperfine fields in antiferromagnetically ordered YBa2Cu3Ox and GdBa2Cu3O7. After determining the μ+ sites, the possibility of anyons or chiral spin ordering in the superconducting YBa2Cu3O7 is discussed. Positive muon implanted in YBa2Cu3O7 feel static magnetic fields of average 1.4 G, which are explicable in terms of nuclear magnetic dipolar fields. Non observation of static local magnetic fields of electronic origin (the upper limit is the order of 0.1 G) means that anyons or chiral spin ordering might not exist in superconducting YBa2Cu3O7. (orig.)