Abstract
We compare the cross-over from a magnetically ordered to a non-magnetic spin liquid state as a function of hydrostatic pressure in the related heavy-fermion antiferromagnets CePd 2Si 2 and CeRh 2Si 2. Both materials exhibit superconductivity at pressures close to the critical pressure p c at which their magnetic ordering temperatures extrapolate to zero. However, in CePd 2Si 2 the normal state resistivity varies according to ϱ ∼ T x (1.1 < x < 1.3) near p c, while CeRh 2Si 2 returns to the Fermi-liquid form ϱ ∼ T 2. This discrepancy between the two materials may be connected to the rapid destruction of the magnetic state in CeRh 2Si 2 with hydrostatic pressure.
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