The effect of uniaxial pressure on the magnetic anomalies of the heavy-fermion metamagnet CeRu2Si2

TL;DR

This study investigates how uniaxial pressure influences magnetic properties and anomalies in the heavy-fermion compound CeRu2Si2, revealing that pressure modulates key physical quantities related to the Kondo effect and hybridization anisotropy.

Contribution

It demonstrates that uniaxial pressure linearly affects magnetic anomalies and susceptibility in CeRu2Si2, linking these effects to changes in the hybridization and Kondo temperature.

Findings

Physical quantities scale with uniaxial pressure, indicating a common energy scale.

Pressure along the c axis decreases, while along the a axis increases, the relevant physical quantities.

Uniaxial pressure controls the anisotropic hybridization affecting the metamagnetic anomaly.

Abstract

The effect of uniaxial pressure (P_u) on the magnetic susceptibility (X), magnetization (M), and magnetoresistance (MR) of the heavy-fermion metamagnet CeRu2Si2 has been investigated. For the magnetic field along the tetragonal c axis, it is found that characteristic physical quantities, i.e., the temperature of the susceptibility maximum (T_max), the pagamagnetic Weiss temperature (Q_p), 1/X at 2 K, and the magnetic field of the metamagnetic anomaly (H_M), scale approximately linearly with P_u, indicating that all the quantities are related to the same energy scale, probably of the Kondo temperature. The increase (decrease) of the quantities for P_u || c axis (P_u || a axis) can be attributed to a decrease (increase) in the nearest Ce-Ru distance. Consistently in MR and X, we observed a sign that the anisotropic nature of the hybridization, which is believed to play an important role in the metamagnetic anomaly, can be controlled by applying the uniaxial pressure. PACS numbers: 75.20.Hr, 71.27.+a, 74.62.Fj