Static magnetic order and superfluid density of RFeAs(O,F) (R=La,Nd,Ce) and LaFePO studied by muon spin relaxation: unusual similarities with the behavior of cuprate superconductors

J P Carlo; Y J Uemura; T Goko; G J Macdougall; J A Rodriguez; W Yu; G M Luke; Pengcheng Dai; N Shannon; S Miyasaka; S Suzuki; S Tajima; G F Chen; W Z Hu; J L Luo; N L Wang

doi:10.1103/PhysRevLett.102.087001

Static magnetic order and superfluid density of RFeAs(O,F) (R=La,Nd,Ce) and LaFePO studied by muon spin relaxation: unusual similarities with the behavior of cuprate superconductors

Phys Rev Lett. 2009 Feb 27;102(8):087001. doi: 10.1103/PhysRevLett.102.087001. Epub 2009 Feb 23.

Authors

J P Carlo¹, Y J Uemura, T Goko, G J Macdougall, J A Rodriguez, W Yu, G M Luke, Pengcheng Dai, N Shannon, S Miyasaka, S Suzuki, S Tajima, G F Chen, W Z Hu, J L Luo, N L Wang

Affiliation

¹ Department of Physics, Columbia University, New York, New York 10027, USA.

PMID: 19257776
DOI: 10.1103/PhysRevLett.102.087001

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 LaFeAs(O0.97F0.03) which indicates possible incommensurate or stripe magnetism; (3) anomalous weak magnetism existing in superconducting LaFePO, CeFeAs(O0.084F0.16), and NdFeAs(O0.88F0.12) but absent in superconducting LaFeAs(O0.92F0.08); and (4) scaling of the superfluid density with T_{c} in the Ce-, La-, and Nd-FeAs superconductors following a nearly linear relationship found in cuprates.