Partial Substitution Effects of the La Site in Two-Leg Ladder Compound LaCuO2.5.

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  • 酸化物超伝導体の合成と特性  はしご化合物LaCuO2.5の希土類サイトの置換効果
  • ハシゴ カゴウブツ LaCuO2.5 ノ キドルイ サイト ノ チカン コウカ

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Abstract

We have studied the effects of partial substitution of La for Y and Sc in two-leg ladder compound LaCuO2.5 synthesized under high pressure by using XRD-Rietveld structural refinements and magnetic susceptibility measurements. The antiferro-magnetic transition temperature(TN) of LaCuO2.5 is 120 K, and is increased to-300 K for the Y substitution, while the Sc substitution reduces TN to-15 K. These substitutions can control the interladder interaction by changing the Cu-O-Cu bond angle bridging two adjacent ladders.

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