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TT: Fachverband Tiefe Temperaturen
TT 52: Heavy Fermions
TT 52.4: Vortrag
Mittwoch, 11. März 2026, 15:45–16:00, HSZ/0103
Tuning the ground state of CePdAl by hydrogenation — Hailiang Xia, Jitong Song, He Sun, Zhaotong Zhuang, Junsen Xiang, Shuai Zhang, and •Peijie Sun — Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
CePdAl is an antiferromagnetic heavy-fermion compound crystallizing in a geometrically frustrated Kagome lattice. We have succeeded in hydrogen doping the bulk single-crystalline CePdAl by an ionic liquid gating technique, resulting in a large lattice expansion of the c axis by more than 20%. The hydrogen-doped sample CePdAlHx is stable in air, and can be subject to various ex-situ transport, magnetic and thermodynamic measurements down to very low temperatures. Hydrogen distribution in CePdAl significantly alters the crystal electric field, reducing the Ising-like magnetic anisotropy, and the antiferromagentic transition temperature TN is reduced from 2.7 K to 1.1 K. Intriguingly, the Kondo effect remains almost intact. We discuss the results in view of a local and anisotropic negative pressure effect realized by hydrogenation.
Keywords: heavy fermion; Kondo lattice; frustration; hydrogenation