Static Magnetic Order and Superfluid Density of $R\mathrm{FeAs}\mathbf{(}\mathbf{O},\mathbf{F}\mathbf{)}$ ($R\mathbf{=}\mathrm{La},\mathrm{Nd},\mathrm{Ce}$) and LaFePO Studied by Muon Spin Relaxation: Unusual Similarities with the Behavior of Cuprate Superconductors

Static Magnetic Order and Superfluid Density of $R FeAs (O, F)$ ( $R = La, Nd, Ce$ ) 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, and N. L. Wang

Phys. Rev. Lett. 102, 087001 – Published 23 February 2009

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 $LaFeAs (O_{0.97} F_{0.03})$ which indicates possible incommensurate or stripe magnetism; (3) anomalous weak magnetism existing in superconducting LaFePO, $CeFeAs (O_{0.084} F_{0.16})$ , and $NdFeAs (O_{0.88} F_{0.12})$ but absent in superconducting $LaFeAs (O_{0.92} F_{0.08})$ ; 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.

Received 14 May 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.087001

Authors & Affiliations

J. P. Carlo¹, Y. J. Uemura^1,*, T. Goko^1,2,3, G. J. MacDougall², J. A. Rodriguez², W. Yu², G. M. Luke², Pengcheng Dai⁴, N. Shannon⁵, S. Miyasaka⁶, S. Suzuki⁶, S. Tajima⁶, G. F. Chen⁷, W. Z. Hu⁷, J. L. Luo⁷, and N. L. Wang⁷

¹Department of Physics, Columbia University, New York, New York 10027, USA
²Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
³TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., V6T 2A3, Canada
⁴Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
⁵H. H. Wills Physics Laboratory, University of Bristol, BS8 1TL Bristol, United Kingdom
⁶Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
⁷Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China

^*To whom correspondences should be addressed. tomo@lorentz.phys.columbia.edu

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Vol. 102, Iss. 8 — 27 February 2009

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Physical Review Letters

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, and N. L. Wang

Phys. Rev. Lett. 102, 087001 – Published 23 February 2009

Abstract

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Static Magnetic Order and Superfluid Density of $R FeAs (O, F)$ ( $R = La, Nd, Ce$ ) and LaFePO Studied by Muon Spin Relaxation: Unusual Similarities with the Behavior of Cuprate Superconductors