Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.6: Poster

Thursday, March 29, 2012, 15:00–19:00, Poster B

Inelastic Neutron Scattering on the heavy-fermion compound YbNi₄P₂ — •Zita Huesges¹, Oliver Stockert¹, Cornelius Krellner¹, Micheal Koza², Christoph Geibel¹, and Frank Steglich¹ — ¹Max Planck Institute CPfS, Dresden, Germany — ²Institut Laue-Langevin, Grenoble, France

It was recently discovered that the strongly correlated electron compound YbNi₄P₂ is one of the few heavy-fermion systems exhibiting a ferromagnetic phase transition at very low temperature (T_C=0.17 K) because of strong Kondo screening. It is thus a very promising candidate to study a Kondo system close to ferromagnetic quantum criticality. While nickel is nonmagnetic in YbNi₄P₂, the ytterbium moments are located on chains along the c-direction of the tetragonal unit cell so that the magnetic interaction is mainly one-dimensional. Together with geometrical frustration in the ab-plane , YbNi₄P₂ is therefore prone to enhanced quantum fluctuations.

Here, we present time-of-flight neutron spectroscopy measurements on polycrystalline YbNi₄P₂ to study the magnetic excitations. This gives insight into the particular magnetic interactions, such as the crystalline electric field and the Kondo fluctuations.