Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.27: Poster
Donnerstag, 29. März 2012, 15:00–19:00, Poster B
Magnetic order and Spin Dynamics in the Heavy Fermion System YbNi4P2 — •Johannes Spehling1, Marco Günther1, Nicholas Yéche1, Hans-Henning Klauss1, Hubertus Luetkens2, Chris Baines2, Cornelius Krellner3, Christoph Geibel3, and Frank Steglich3 — 1Institut für Festkörperphysik, TU Dresden,Germany — 2Laboratory for Muon-Spin Spectroscopy, PaulScherrer Institut, Villigen, Switzerland — 3Max-Planck-Institutfür Chemische Physik fester Stoffe Dresden, Germany
A longstanding question in the field of quantum criticality relates to the possible existence of a ferromagnetic (FM) quantum critical point (QCP). At a QCP, collective quantum fluctuations tune the system continuously from a magnetically ordered to a non-magnetic ground state. However, so far no 4f-material with a FM QCP is found. Recently, in the HF metal YbNi4P2 with a quasi 1D-electronic structure, FM quantum criticality above a low FM transition temperature of TC=170 mK was suggested. Our zero field muon spin relaxation on YbNi4P2 proves static magnetic order with a strongly reduced ordered Yb3+ moment below TC. Above TC, the muon asymmetry function P(t,B) is dominated by quasi homogeneous spin fluctuations and exhibits a time-field scaling relation P(t,B)=P(t/Bγ) indicating cooperative critical spin dynamics. At T=190 mK, slightly above TC, γ=0.81(5) K suggesting time-scale invariant power-law behavior for the dynamic electronic spin-spin autocorrelation function. The results will be disussed in comparizon with the AFM compound YbRh2Si2. [1] C. Krellner et al., New J. Phys. 13, 103014 (2011).