Static Magnetic Order and Superfluid Density of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi><mml:mi>FeAs</mml:mi><mml:mo mathvariant="bold" stretchy="false">(</mml:mo><mml:mi mathvariant="bold">O</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="bold">F</mml:mi><mml:mo mathvariant="bold" stretchy="false">)</mml:mo></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi><mml:mo mathvariant="bold">=</mml:mo><mml:mi>La</mml:mi><mml:mo>,</mml:mo><mml:mi>Nd</mml:mi><mml:mo>,</mml:mo><mml:mi>Ce</mml:mi></mml:math>) and LaFePO Studied by Muon Spin Relaxation: Unusual Similarities with the Behavior of Cuprate Superconductors

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.

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