Effect of uniaxial pressure on the magnetic anomalies of the heavy-fermion metamagnet CeRu 2 Si 2

The effect of uniaxial pressure ${(P}_{u})$ on the magnetic susceptibility $(\ensuremath{\chi}),$ magnetization $(M),$ and magnetoresistance (MR) of the heavy-fermion metamagnet ${\mathrm{CeRu}}_{2}{\mathrm{Si}}_{2}$ 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 ${(T}_{\mathrm{max}}),$ the paramagnetic Weiss temperature $({\ensuremath{\Theta}}_{p}),$ $1/\ensuremath{\chi}$ 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 ${P}_{u}\ensuremath{\Vert}c$ axis ${(P}_{u}\ensuremath{\Vert}a$ axis) can be attributed to a decrease (increase) in the nearest Ce-Ru distance. Consistently in MR and $\ensuremath{\chi},$ 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.