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TT: Fachverband Tiefe Temperaturen

TT 42: Poster: Correlated Electrons I

TT 42.5: Poster

Mittwoch, 29. März 2023, 15:00–18:00, P2/OG2

Spin excitations in the field-induced phase of Ce₂Bi — •Nikolai Pavlovskii¹, Anton Kulbakov¹, Aleksandr Sukhanov¹, Michael Smidman², Federico Mazza³, and Dmytro Inosov¹ — ¹TU Dresden, Dresden, Germany — ²Zhejiang University, Hangzhou, China — ³Vienna University of Technology, Austria

The compound Ce₂Bi represents a rare example of the heavy fermion materials that exhibit the coexistence of an antiferromagnetic magnetic (AFM) order and a tricritical point (TCP) in their temperature-magnetic field phase diagram. This combination is unusual because the TCP typically occurs in the ferromagnetic (FM) heavy fermion materials. In AFMs, the magnetic order can in many cases be continuously suppressed to zero temperature at a quantum critical point (QCP) by tuning pressure, magnetic fields, or chemical substitution. In the case of FMs, the situation is usually different. There, a QCP is generally avoided by changing the character of the magnetic phase transition from the second order to the first order, which induces a TCP. Using neutron time-of-flight spectroscopy, we observed two weakly-dispersed magnetic excitations modes in Ce₂Bi below Neel temperature that seem to show a nontrivial response to the applied magnetic field.