1992年
High-pressure transport phenomena in polycrystalline (Pb(1x)/2Cu(1-x)/2) Sr2(Y1-xCax)Cu2O7
Physical Review B
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- 巻
- 45
- 号
- 18
- 開始ページ
- 10713
- 終了ページ
- 10718
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1103/PhysRevB.45.10713
The effect of pressure on Tc for polycrystalline Pb 1:2:1:2-phase material is investigated up to 2 GPa using a piston-cylinder apparatus. The pressure coefficient of Tc is positive and depends strongly on the ambient-pressure Tc. We discuss the relation between d lnTc/dp and Tc. The general trend that d lnTc/dp increases with decreasing Tc can be explained by two phenomenological assumptions: a parabolic relation between Tc and the carrier concentration n in the CuO2 planes and a linear increase of n with increasing pressure. An unusually large logarithmic pressure coefficient of Tc is reported (d lnTc/dp=0.65 GPa-1, Tc=16.8 K at ambient pressure). This result suggests that there is another mechanism for the increase in the carrier concentration with an increase in pressure, besides that due to charge transfer. We propose that this large d lnTc/dp is correlated with the pressure-induced delocalization of holes. © 1992 The American Physical Society.
- ID情報
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- DOI : 10.1103/PhysRevB.45.10713
- ISSN : 0163-1829
- SCOPUS ID : 0009240491