Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 62: Correlated Electrons – Poster II

TT 62.5: Poster

Mittwoch, 11. März 2026, 15:00–17:00, P4

Locally non Centrosymmetric RRh₂Ga₂ (R=Ce, La) Systems: NMR/NQR as local probe for Magnetism and Superconductivity — •I. Neme¹, A. M. Strydom², D. T. Adroja³, V. K. Anand^3,4, H. Rosner¹, and M. Baenitz¹ — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²Physics Department, University of Johannesburg, South Africa — ³ISIS Facility, Rutherford Appleton Laboratory, Chilton, UK — ⁴Department of Physics, National Institute of Technology Agartala, Tripura, India

CeRh₂Ga₂ belongs to the class of locally non-centrosymmetric (LNC) correlated Ce Kondo systems [1] and is closely related to the recently discovered superconductor CeRh₂As₂ [2]. The non-magnetic reference LaRh₂Ga₂ is superconducting with relatively high T_c of 3.7 K, in contrast with 0.28 K for LaRh₂As₂. We have performed ^69,71Ga, ¹³⁹La NMR and ^69,71Ga NQR studies to probe the magnetism and the superconductivity. For characterization, we present magnetization and heat capacity measurements. Calculations of the band structure and the local electric field gradient at the Ga and La sites support our experimental results. We discuss the magnetic ground state of the Ce system and the occurrence of superconductivity in the La reference on basis of correlations and LNC properties.
[1] V. K. Anand et al., J. Phys. Cond. Matt. 29 (2017)
[2] S. Khim et al., Science 373 (2021)

Keywords: superconductivity; NMR; NQR; Kondo systems