2011/08/22 by C Krellner, S Lausberg, A Steppke +7 · 80 citations
Materials Science · Physics and Astronomy · #Criticality #Electrical resistivity and conductivity #Electron #Fermion #Ferromagnetism #Magnetic moment #Metal #Metallurgical and Alloy Processes #Quantum #Rare-earth and actinide compounds #Topological Materials and Phenomena #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1088/1367-2630/13/10/103014
published in New Journal of Physics 13(10), 103014 (IOP Publishing) · 14 pages, 6 figures
arxiv created 2011/08/22 · openalex publication_date 2011/10/12 · arxiv updated 2011/10/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a new Kondo-lattice system, YbNi 4 P 2 , which is a clean heavy-fermion metal with a severely reduced ferromagnetic (FM) ordering temperature at T C = 0.17 K, evidenced by distinct anomalies in susceptibility, specific heat and resistivity measurements. The FM nature of the transition, with only a small ordered moment of ∼0.05 μ B , is established by a diverging susceptibility at T C with huge absolute values in the ferromagnetically ordered state, severely reduced by small magnetic fields. Furthermore, YbNi 4 P 2 is a stoichiometric system with a quasi-one-dimensional crystal and electronic structure and strong correlation effects which dominate the low-temperature properties. This is reflected by a stronger-than-logarithmically diverging Sommerfeld coefficient and a linear-in- T resistivity above T C , which cannot be explained by current theoretical predictions. These exciting characteristics are unique among all correlated electron systems and make this an interesting material for further in-depth investigations.