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TT: Fachverband Tiefe Temperaturen

TT 65: Quantum-Critical Phenomena II

TT 65.9: Vortrag

Mittwoch, 14. März 2018, 17:15–17:30, HFT-FT 131

CeRh₂As₂: a Ce-based Kondo-lattice system very close to a possible multipolar quantum critical point — •Seunghyun Khim¹, Jacintha Banda¹, Daniel Hafner¹, Dongjin Jang^1,2, Manuel Brando¹, and Christoph Geibel¹ — ¹Max Planck Institut für Chemische Physik fester Stoffe, Dresden, Germany — ²Max Planck-POSTECH/KOREA Center for Complex Phase Materials, Pohang, Republic of Korea

We have recently grown single crystals of the new compound CeRh₂As₂ and studied its physical properties. Resistivity, specific heat (C_p) and magnetic susceptibility results evidence a strong Kondo interaction with T_K ∼ 25 K. At zero field, two transitions occur at T₁ ∼ 0.2 K and T₂ ∼ 0.3 K. T₁ and T₂ much smaller than T_K place this system very close to a hybridization induced quantum critical point (QCP). With magnetic fields T₁ is gradually suppressed, suggesting its magnetic origin. T₂, on the other hand, increases slowly with fields, similar to the quadrupolar order in CeB₆. The suggestive quadrupolar order at T₂ is compatible with high-T C_p data that imply an effective quasi-quartet ground state which provides a quadrupolar degree of freedom. Therefore our result indicate CeRh₂As₂ to be a unique Kondo-lattice system of strong potential relevance for the multipolar QCPs.