Relation between cuprate superconductivity and magnetism: A Raman study of (CaLa)(BaLa)${}_2$Cu${}_3$O${}_y$

Abstract

We present an investigation of charge-compensated antiferromagnetic (Ca${}_x$La${}_{1-x}$)(Ba${}_{1.75-x}$La${}_{0.25+x}$)Cu${}_3$O${}_y$ single crystals using Raman scattering as well as muon spin rotation. In this system the parameter $x$ controls the Cu-O-Cu superexchange interaction via bond distances and buckling angles. The oxygen content $y$ controls the charge doping. In the absence of doping the two-magnon peak position is directly proportional to the superexchange strength $J$. We find that both $x$ and $y$ affect the peak position considerably. The Néel temperature determined from muon spin rotation on the same samples independently confirms the strong dependence of the magnetic interaction on $x$ and $y$. We find a considerable increase in the maximum superconducting transition temperature $T_c^{max}$ with $J$. This is strong evidence of the importance of orbital overlap to superconductivity in this family of cuprates.

References in corpus (4)

• A magnetic analog of the isotope effect in cuprates
• Universal doping dependence of the ground state staggered magnetization in cuprates
• 17O-NMR Knight shift study of the interplay between superconductivity and pseudogap in (Ca_xLa_{1-x})(Ba_{1.75 - x}La_{0.25 + x})Cu_3O_y
• Linking Dynamic and Thermodynamic Properties of Cuprates; an ARPES study of (CaLa)(BaLa)${}_2$Cu${}_3$O${}_y$

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• Relevance of magnetism to cuprate superconductivity: Lanthanides versus charge-compensated cuprates
• Systematic Raman study of optical phonons in $R$Ba${}_2$Cu${}_3$O${}_{6+\delta }$ ($R$ = Y, Dy, Gd, Sm, Nd): Antiferromagnetic coupling strength versus lattice parameters