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Carrier concentration and Tc in HgBa2Ca2Cu3O8+z

✍ Scribed by T. Watanabe; T. Tonozuka; H. Ihara; K. Tokiwa; M. Hirabayashi


Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
218 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis


The correlation between carrier concentrations and Tc's was investigated in HgBa2 Ca2Cua Os+~. The Tc increased linearly with decreasing carrier concentration. The maximum Tc value (133.2 I() w~ obtained at a carrier concentration of 2.0 Γ— 1021 cm -a, which corresponds to 0.16 holes per CuO2 plane. On the other hand, the resistivity increased monotonically with decreasing carrier concentration. :rl,e temperature dependence of inverse Hall mobility shows a T2-dependence below about 240 K. In this range the resistivity of the sample with the highest Tc deviates clearly from linear dependence on the temperature.


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Samples of HgBa2Ca2Cu3Os.6 were successfully prepared and investigated. By examining the X-ray diffraction, mission electron microscopy, magnetization and resistivity, we found that HgBa2CaaCusOs+8 possesses an orthorhombic structure with lattice parameters o--5.451(2) A, b=5.432(2) ,~ and c= 15.826