Universal scaling behavior under pressure in the heavy-fermion antiferromagnet CeRh2Si2: 29Si NMR study

The microscopic origin of a magnetic phase diagram under pressure in the heavy-fermion antiferromagnet CeRh2Si2 was investigated using the Si-29 nuclear magnetic resonance (NMR) technique. Owing to the characteristics of the hyperfine form factor at the Si site, which filters specific q-dependent fluctuations around antiferromagnetic q vectors, we investigated the temperature and pressure dependences of q-independent local fluctuations caused by the single-site Kondo effect. A universal scaling behavior observed on the energy scale of the local fluctuations in the entire pressure region demonstrates that the characteristic energy scale T-0 of Kondo interactions monotonically increases by applying pressure without a critical anomaly around the quantum critical pressure P-c of antiferromagnetism. Our NMR result agrees with the Doniach picture of the heavy-fermion phase diagram, where the progressive delocalization of the f electrons occurs across P-c, accompanied by the development of antiferromagnetic correlations among the f electrons.

Automated summary

Investigating the microscopic origin of a magnetic phase diagram under pressure in the heavy-fermion antiferromagnet CeRh2Si2 using the Si-29 nuclear magnetic resonance (NMR) technique revealed characteristics of local fluctuations caused by the single-site Kondo effect, and a universal scaling behavior of the energy scale of these local fluctuations with increasing pressure. This supports the Doniach picture of heavy-fermion phase diagrams, showing the progression of f electron delocalization and development of antiferromagnetic correlations with pressure.