压力对HgBa_2Ca_2Cu_3O_（8＋y）超导转变温度的影响

S PRESSURE EFFECT ON THE CRITICAL TEMPERATURE OF HgBa 2Ca 2Cu 3O 8+y

利用低温超高压装置，测量了Ｈｇ系样品ＨｇＢａ２Ｃａ２Ｃｕ３Ｏ８＋ｙ（Ｈｇ－１２２３）超导转变温度Ｔｃ在压力作用下的增强效应。压力最高达７．８ＧＰａ，超导起始转变温度常压下为１３０Ｋ，加压到５．４ＧＰａ时获得最高温度为１４０Ｋ。在５．４ＧＰａ以下获得ｄＴｃ／ｄｐ为１．８５Ｋ／ＧＰａ。

The critical temperature T c of the superconductor HgBa 2Ca 2Cu 3O 8+ y (Hg 1223) sample is determined by four probe resistivity measurement under quasi hydrostatic pressure up to 7.8GPa. T c increases from 130K at ambient pressure to 141K under a pressure up to 5.4GPa.d T c/d p =1.85K/GPa at pressures below 5 4GPa.The moving of some oxygen atoms and the coupling between CuO 2 planes were used to analysed the pressure effect on T c of the high T c superconductors.