EVIDENCE AGAINST HOLE FORMATION BY CA IN YBA2CU4O8

被引:23
作者
KNUPFER, M [1 ]
NUCKER, N [1 ]
ALEXANDER, M [1 ]
ROMBERG, H [1 ]
ADELMANN, P [1 ]
FINK, J [1 ]
KARPINSKI, J [1 ]
KALDIS, E [1 ]
RUSIECKI, S [1 ]
JILEK, E [1 ]
机构
[1] SWISS FED INST TECHNOL, FESTKORPERPHYS LAB, CH-8093 ZURICH, SWITZERLAND
来源
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1991年 / 182卷 / 1-3期
关键词
D O I
10.1016/0921-4534(91)90457-A
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report on electron energy-loss studies of Ca-doped YBa2Cu4O8. O 1s and Ca 2p absorption edges indicate that there is almost no change of the hole concentration upon Ca doping and that a major fraction of the Ca enters the Ba site. This suggests that the increase of T(c) upon Ca doping is not caused by a formation of additional holes as expected for the replacement of trivalent Y by divalent Ca.
引用
收藏
页码:62 / 66
页数:5
相关论文
共 42 条
[21]   PRESSURE-DEPENDENCE OF SUPERCONDUCTING TRANSITION-TEMPERATURE IN CA-DOPED YBA2CU4O8 [J].
MIYATAKE, T ;
KOSUGE, M ;
KOSHIZUKA, N ;
TAKAHASHI, H ;
MORI, N ;
TANAKA, S .
PHYSICA C, 1990, 167 (3-4) :297-300
[22]   CALCIUM-SUBSTITUTED Y-BA-CU-O SUPERCONDUCTORS WITH ENHANCED TC SYNTHESIZED AT ELEVATED OXYGEN PRESSURES [J].
MORRIS, DE ;
NARWANKAR, P ;
SINHA, APB ;
TAKANO, K ;
FAYN, B ;
SHUM, VT .
PHYSICAL REVIEW B, 1990, 41 (07) :4118-4122
[23]   THE CRYSTAL-STRUCTURE OF YBA2CU4O8 AS A FUNCTION OF PRESSURE UP TO 5 GPA [J].
NELMES, RJ ;
LOVEDAY, JS ;
KALDIS, E ;
KARPINSKI, J .
PHYSICA C, 1990, 172 (3-4) :311-324
[24]   EXPERIMENTAL ELECTRONIC-STRUCTURE STUDIES OF LA2-XSRXCUO4 [J].
NUCKER, N ;
FINK, J ;
RENKER, B ;
EWERT, D ;
POLITIS, C ;
WEIJS, PJW ;
FUGGLE, JC .
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1987, 67 (01) :9-14
[25]   EVIDENCE FOR HOLES ON OXYGEN SITES IN THE HIGH-TC SUPERCONDUCTORS LA2-XSRXCUO4 AND YBA2CU3O7-Y [J].
NUCKER, N ;
FINK, J ;
FUGGLE, JC ;
DURHAM, PJ ;
TEMMERMAN, WM .
PHYSICAL REVIEW B, 1988, 37 (10) :5158-5163
[26]  
NUCKER N, 1990, STUDIES HIGH TEMPERA, V6, P145
[27]  
NUCKER N, IN PRESS
[28]   ELECTRONIC BAND-STRUCTURE OF YBA2CU4O8 [J].
OGUCHI, T ;
SASAKI, T ;
TERAKURA, K .
PHYSICA C, 1990, 172 (3-4) :277-281
[29]   APEX OXYGEN AND CRITICAL-TEMPERATURE IN COPPER-OXIDE SUPERCONDUCTORS - UNIVERSAL CORRELATION WITH THE STABILITY OF LOCAL SINGLETS [J].
OHTA, Y ;
TOHYAMA, T ;
MAEKAWA, S .
PHYSICAL REVIEW B, 1991, 43 (04) :2968-2982
[30]   THE PRESSURE-DEPENDENCE OF THE TRANSPORT-PROPERTIES OF YBA2CU3O7-DELTA [J].
PARKER, ID ;
FRIEND, RH .
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1988, 21 (11) :L345-L352