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Synthesis, structure, and superconductivity of La7+2 Sr1-4 K Na Cu4O16-
Deyang Xu1, Guohong Cai2, Peiliang Huang3
1MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology Guilin 541004 People's Republic of China.
Abstract:
Sodium and potassium have been doped into La7SrCu4O16- to form La7+2 Sr1-4 K Na Cu4O16- solid solutions by a solid-state reaction, which crystallizes in the I4/mmm space group when 0 ≤ x < 0.16 and Fmmm when 0.16 < x ≤ 0.25. With the equivalent replacement of four Sr2+ by one Na+, one K+ and two La3+, it is very interesting to find that T zero c (the definition is presented in the introduction part) of La7+2 Sr1-4 K Na Cu4O16- does not remain constant with an increase in x but first increases from 14.8 K for x = 0.00 to 33.9 K for x = 0.10 and then decreases to 18.5 K for x = 0.175.
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