Temperature dependent tunneling spectroscopy in the heavy fermion CeRu2Si2 and in the antiferromagnet CeRh2Si2

Abstract

CeRu2Si2 and CeRh2Si2 are two similar heavy fermion stoichiometric compounds located on the two sides of the magnetic quantum critical phase transition. CeRh2Si2 is an antiferromagnet below T_N=36 K with moderate electronic masses whereas CeRu2Si2 is a paramagnetic metal with particularly heavy electrons. Here we present tunneling spectroscopy measurements as a function of temperature (from 0.15 K to 45 K). The tunneling conductance at 0.15 K reveals V-shaped dips around the Fermi level in both compounds, which disappear in CeRu2Si2 above the coherence temperature, and above the Néel temperature in CeRh2Si2. In the latter case, two different kinds of V-shaped tunneling conductance dips are found.

References in corpus (12)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Imaging the Fano Lattice to 'Hidden Order' Transition in URu2Si2
• Visualizing heavy fermions emerging in a quantum critical Kondo lattice
• The quantum critical point in CeRhIn_5: a resistivity study
• Antiferromagnetic criticality at a heavy-fermion quantum phase transition
• How Kondo Holes Create Intense Nanoscale Heavy-Fermion Hybridization Disorder
• High-field metamagnetism in the antiferromagnet CeRh${}_2$Si${}_2$
• Decoupling between Field-instabilities of Antiferromagnetism and Pseudo-metamagnetism in Rh-doped CeRu2Si2 Kondo Lattice
• Local Electronic Structure and Fano Interference in Tunneling into a Kondo Hole System
• Collapse of antiferromagnetism in CeRh2Si2 : volume versus entropy
• Gap opening with ordering in PrFe4P12 studied by local tunneling spectroscopy

Cited by in corpus (1)

• Orbital-selective Kondo-lattice and enigmatic f-electrons emerging from inside the antiferromagnetic phase of a heavy fermion