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We have determined the crystal structures and superconducting transitiontemperatures of La1.48Nd0.4Sr0.12CuO4 under nearly hydrostatic pressures indiamond anvil cells to 5.0 GPa and 19.0 GPa, respectively. Synchrotron x-raypowder diffraction measurements were used to establish the pressure-temperaturestructural phase diagram. Under pressure the superconducting transitiontemperature increases rapidly from Tc = 3 K to a maximum value of 22 K at 5GPa, a pressure slightly greater than that required to stabilize theundistorted I4/mmm structure in the superconducting state. Increasing thepressure further to 19 GPa leads to a decrease in Tc to ~12 K. These resultsare discussed in relation to earlier high pressure measurements for similarmaterials.Comment: to appear in Phys. Rev.

physical review. b, condensed matter and materials physics

High-pressure study of structural phase transitions and superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mn>1.48</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Nd</mml:mi><mml:mn>0.4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>0.12</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:…

High-pressure study of structural phase transitions and superconductivity inLa1.48Nd0.4Sr0.12CuO