Magnetic order and spin dynamics in the proximity of a ferromagnetic quantum critical point: a &lt;em&gt;μ&lt;/em&gt;sR study of YbNi&lt;sub&gt;4&lt;/sub&gt;P&lt;sub&gt;2&lt;/sub&gt;

Spehling, J.; Günther, M.; Krellner, C.; Yèche, N.; Luetkens, H.; Baines, C.; Geibel, C.; Klauss, H.-H.

doi:10.1103/PhysRevB.85.140406

Magnetic order and spin dynamics in the proximity of a ferromagnetic quantum critical point: a μsR study of YbNi₄P₂

Spehling J, Günther M, Krellner C, Yèche N, Luetkens H, Baines C, Geibel C & Klauss H-H

Citation

Spehling, J., Günther, M., Krellner, C., Yèche, N., Luetkens, H., Baines, C., … Klauss, H. H. (2012). Magnetic order and spin dynamics in the proximity of a ferromagnetic quantum critical point: a μsR study of YbNi₄P₂. Physical Review B, 85(14), 140406 (5 pp.). https://doi.org/10.1103/PhysRevB.85.140406

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:12509

The local 4f-electronic spin dynamics and magnetic order in YbNi₄P₂ were studied by means of muon-spin relaxation measurements. Zero-field muon-spin relaxation proves static magnetic order with a strongly reduced ordered Yb³⁺ moment of (2.5-4.6)×10^-2μ_B, below T_C = 140 mK. Above T_C, the muon-spin polarization P(t,B) is dominated by quasihomogeneous spin fluctuations and exhibits a time-field scaling relation P(t,B) = P(t/B^γ), indicating cooperative critical spin dynamics in the system. At T = 190 mK, slightly above T_C, γ = 0.81(5), suggesting time-scale invariant power-law behavior for the dynamic electronic spin-spin autocorrelation function.