<p>The compound <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\hbox {La}_{1-x}\hbox {Sr}_x\hbox {MnO}_3\)</EquationSource> </InlineEquation> exhibits a charge order (CO) state at <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(x\approx 1/8\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(T&lt;T_{co}\)</EquationSource> </InlineEquation>, which recalls the CO state with a decrease in the temperature of the superconducting transition, <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(T_c\)</EquationSource> </InlineEquation>, observed in all cuprates at this doping value. Local excitations of lattice and magnetic origins measured in the two-dimensional metallic state of <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(\hbox {La}_{7/8}\hbox {Sr}_{1/8}\hbox {MnO}_3\)</EquationSource> </InlineEquation> reveal the existence of bipolarons of size 4<i>a</i> resulting from structural and antiferromagnetic pairings of hole-rich orbital polarons of size 2<i>a</i>. They are intertwined with hole-poor domains in a disordered state at <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(T&gt;T_{co}\)</EquationSource> </InlineEquation> which become ordered on a chessboard organized in a 3D-order state of ferromagnetically paired polarons at <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(T&lt;T_{co}\)</EquationSource> </InlineEquation>. Applied to the <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(\hbox {CuO}_2\)</EquationSource> </InlineEquation> planes of the cuprates of the “214” family, this model produces stripes of bipolarons intertwined with stripes of antiferromagnetically arranged spins, hole-poor, both of size 4<i>a</i>, leading to a spin density wave with a wave vector <InlineEquation ID="IEq11"> <EquationSource Format="TEX">\(\delta =1/8\)</EquationSource> </InlineEquation>, a charge density wave with <InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(q=1/4\)</EquationSource> </InlineEquation>, the Yamada laws <InlineEquation ID="IEq13"> <EquationSource Format="TEX">\(\delta (x)=x\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq14"> <EquationSource Format="TEX">\(T_c\propto \delta\)</EquationSource> </InlineEquation> and a decrease of <InlineEquation ID="IEq15"> <EquationSource Format="TEX">\(T_c\)</EquationSource> </InlineEquation> at x=1/8. This work invokes relevance of a bipolaronic origin of high <InlineEquation ID="IEq16"> <EquationSource Format="TEX">\(T_c\)</EquationSource> </InlineEquation> superconductivity, in which bipolarons of size 4<i>a</i> can play a major role.</p>

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

From chessboard of bipolarons of size 4a in cubic \(\hbox {La}_{7/8}\hbox {Sr}_{1/8}\hbox {MnO}_3\) to stripes of the same bipolarons in layered high \(T_c\) cuprates

  • Martine Hennion,
  • Alexandre Ivanov,
  • Claudine Lacroix,
  • Bernard Hennion

摘要

The compound \(\hbox {La}_{1-x}\hbox {Sr}_x\hbox {MnO}_3\) exhibits a charge order (CO) state at \(x\approx 1/8\) and \(T<T_{co}\) , which recalls the CO state with a decrease in the temperature of the superconducting transition, \(T_c\) , observed in all cuprates at this doping value. Local excitations of lattice and magnetic origins measured in the two-dimensional metallic state of \(\hbox {La}_{7/8}\hbox {Sr}_{1/8}\hbox {MnO}_3\) reveal the existence of bipolarons of size 4a resulting from structural and antiferromagnetic pairings of hole-rich orbital polarons of size 2a. They are intertwined with hole-poor domains in a disordered state at \(T>T_{co}\) which become ordered on a chessboard organized in a 3D-order state of ferromagnetically paired polarons at \(T<T_{co}\) . Applied to the \(\hbox {CuO}_2\) planes of the cuprates of the “214” family, this model produces stripes of bipolarons intertwined with stripes of antiferromagnetically arranged spins, hole-poor, both of size 4a, leading to a spin density wave with a wave vector \(\delta =1/8\) , a charge density wave with \(q=1/4\) , the Yamada laws \(\delta (x)=x\) and \(T_c\propto \delta\) and a decrease of \(T_c\) at x=1/8. This work invokes relevance of a bipolaronic origin of high \(T_c\) superconductivity, in which bipolarons of size 4a can play a major role.