Superconducting and structural properties of PrBa2Cu3Ox under high pressure

T-c and lattice parameters of the superconducting PrBa2Cu3,O-x, were invest igated as a function of pressure up to 10 GPa. It was found that T-c's of t he compounds were enhanced significantly with increase of pressure. The pre ssure coefficient of T-c, dT(c)/dP, decreased with increase of the oxygen c ontent of the compound. X-ray diffraction using a diamond anvil cell reveal ed that lattice parameters a, b, c were compressed linearly as a function o f pressure. The results contradict with the expectation from the "hybridiza tion model". (C) 1999 Elsevier Science B.V. All rights reserved.