Abstract
Superconducting La1.8Sr0.2CuO4 has been investigated under pressure. Its resistiveT c -midpoint was found to be 37 K at ambient pressure. It inductively determinedT c is 33 K monotonically shifting up to 38.4 K at 19.2 kbar. The initial linear increase is 0.295 K/kbar. X-ray investigations in a diamond anvil revealed no phase transformation of the K2NiF4 structure up to about 50 kbar at 300 K, 60 K and 15 K. The bulk modulus of La1.8Sr0.2CuO4 was 1070 kbar at 300 K and 1500 kbar at 15 K. Thec/a ratio decreases and shows pronounced differences between room temperature and low temperature data under pressure. Multi-phase Y−Ba−Cu-Oxide with resistiveT c -onset of 90 K was investigated under pressure, too. The inductive transition starts at 70 K and is completed at 20 K. The superconducting volume fraction was estimated to be about 2% at 10 K.
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Dietrich, M.R., Fietz, W.H., Ecke, J. et al. Structure and superconductivity of La1.8Sr0.2CuO4 and multi-phase Y1.2Ba0.8CuO4 under high pressure. Z. Physik B - Condensed Matter 66, 283–287 (1987). https://doi.org/10.1007/BF01305418
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DOI: https://doi.org/10.1007/BF01305418