Lattice Parameter and Its Pressure Dependence of High <I>T</I><SUB>c</SUB> Sr<I><SUB>x</SUB></I>La<SUB>2−<I>x</I></SUB>CuO<SUB>4−<I>y</I></SUB> (<I>x</I>∼0.6) Prepared under Reducing Condition
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Lattice parameters of superconducting Sr<I><SUB>x</SUB></I>La<SUB>2−<I>x</I></SUB>CuO<SUB>4−<I>y</I></SUB> (<I>x</I>∼0.6) with <I>T</I><SUB>c</SUB> onset above 50 K prepared under a reducing condition and pressure dependence of the parameters have been studied. By reducing treatment, the lattice parameter <I>c</I><SUB>0</SUB> at ambient pressure was shortened from 13.25 to 13.20 Å and <I>T</I><SUB>c</SUB> onset was increased from below 10 K to above 50 K. For the high <I>T</I><SUB>c</SUB> specimen, compressibility along <I>c</I>-axis was larger than that along <I>a</I>-axis. These results suggest that the high <I>T</I><SUB>c</SUB> specimen with Sr content <I>x</I> of about 0.6 has a large amount of oxygen vacancies which are likely to be created in vertical sites of CuO<SUB>6</SUB> clusters in K<SUB>2</SUB>NiF<SUB>4</SUB> structure.
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公益社団法人 応用物理学会 | 論文
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