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Pressure Dependence of the Resistivity in the Layered Perovskites Sr2RuO4and Sr3Ru2O7

We present resistivity measurements on high-purity single crystals of Sr 2 RuO 4 and Sr 3 Ru 2 O 7 under hydrostatic pressure. The Sr 2 RuO 4 samples have an ambient pressure superconducting transition temperature T s ≈1.5 K. From the rate of decrease of the superconducting transition temperature in Sr 2 RuO 4 with pressure, we deduce a critical pressure of the superconducting phase of the order of 80 kbar. The decrease of the T 2 -coefficient of the resistivity with increasing pressure in both materials suggests a magnetic cross-over at negative rather than at positive pressures.