Fig. 3: Temperature dependence of resistance (R) under various pressures for tetragonal La3Ni2O7-δ. | Nature Communications

Fig. 3: Temperature dependence of resistance (R) under various pressures for tetragonal La3Ni2O7-δ.

From: Spin density wave rather than tetragonal structure is prerequisite for superconductivity in La3Ni2O7-δ

Fig. 3

a and b Temperature-dependent resistance for tetragonal La3Ni2O7-δ under various pressures for two samples. The R(T) curves show a metallic behavior without any trace originating from superconducting transition or SDW under the pressure up to 30.3 GPa in the whole temperature range. All the above measurements were conducted on a DAC using Helium gas as the pressure-transmitting medium so as to get a more homogeneous pressure environment. c and d The R(T) curves for tetragonal La3Ni2O7-δ at various pressures using NaCl as the pressure-transmitting medium. The resistance continually decreases with increasing pressure, and no anomaly arising from the superconductivity or SDW is observed. To compare the two different pressure-transmitting media, R(T) shows some difference due to pressure inhomogeneity, especially a slight upturn shows up at low temperature below 20 K under high pressure above 40 GPa for the case of using NaCl as the pressure-transmitting medium.

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