Possible Anisotropic Order Parameter in Pyrochlore Superconductor KOs2O6 Probed by Muon Spin Rotation
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概要
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Magnetic penetration depth (λ<SUB>eff</SUB>) in a pyrochlore superconductor KOs<SUB>2</SUB>O<SUB>6</SUB> was studied by means of muon spin rotation (μSR). The temperature dependence of the transverse spin relaxation rate, which is proportional to λ<SUB>eff</SUB><SUP>−2</SUP>, exhibits a considerable deviation from that expected for the empirical two-fluid model (∝<I>T</I><SUP>4</SUP>), obeying a <I>T</I><SUP>2</SUP> tendency. Furthermore, λ<SUB>eff</SUB> apparently increases with increasing applied field, suggesting the presence of nonlinear and nonlocal effects. The present result strongly suggests that the superconducting order parameter in KOs<SUB>2</SUB>O<SUB>6</SUB> is anisotropic or multigapped with a small energy gap.
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THE PHYSICAL SOCIETY OF JAPAN | 論文
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