The Strain Derivatives of $T_c$ in HgBa${}_2$CuO${}_{4+\delta }$: CuO${}_2$ Plane Alone is Not Enough

Abstract

The strain derivatives of $T_c$ along the $a$ and $c$ axes have been determined for HgBa${}_2$CuO${}_{4+\delta }$ (Hg1201), the simplest monolayer cuprate with the highest $T_c$ of all monolayer cuprates ($T_c$ = 97 K at optimal doping). The underdoped compound with the initial $T_c$ of 65 K has been studied as a function of pressure up to 20 GPa by magnetic susceptibility and X-ray diffraction (XRD). The observed linear increase in $T_c$ with pressure is the same as previously been found for the optimally-doped compound. The above results have enabled the investigation of the origins of the significantly different $T_c$ values of optimally doped Hg1201 and the well-studied compound La${}_{2-x}$Sr${}_x$CuO${}_4$ (LSCO), the latter value of $T_c$ = 40 K being only about 40% of the former. Hg1201 can have almost identical CuO${}_6$ octahedra as LSCO if specifically strained. When the apical and in-plane CuO${}_2$ distances are the same for the two compounds, a large discrepancy in their $T_c$ remains. Differences in crystal structures and interactions involving the Hg-O charge reservoir layers of Hg1201 may be responsible for the different $T_c$ values exhibited by the two compounds.

5 pages, 3 figures, 1 table, and Appendix

References in corpus (7)

• Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor
• Origin of the material dependence of $T_c$ in the single-layered cuprates
• Demonstrating the model nature of the high-temperature superconductor HgBa${}_2$CuO${}_{4+\Delta }$
• Optical and thermodynamic properties of the high-temperature superconductor HgBa_2CuO_4+delta
• Multiorbital analysis of the effects of uniaxial and hydrostatic pressure on $T_c$ in the single-layered cuprate superconductors
• Optimal T${}_c$ of cuprates: role of screening and reservoir layers
• Bulk and Surface Nanoscale Hole Density Inhomogeneity in HgBa${}_2$CuO${}_{4+\delta }$ and Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Cuprates

Cited by in corpus (10)

• New Perspective on the Phase Diagram of Cuprate High-Temperature Superconductors
• Synchrotron x-ray scattering study of charge-density-wave order in HgBa${}_2$CuO${}_{4+\delta }$
• Drastic suppression of superconducting $T_c$ by anisotropic strain near a nematic quantum critical point
• Strain-Engineering Mott-Insulating La${}_2$CuO${}_4$
• Angle-resolved photoemission spectroscopy study of HgBa${}_2$CuO${}_{4+\delta }$
• Direct Observation of Orbital Hybridisation in a Cuprate Superconductor
• Growth and characterization of HgBa2CaCu2O6+d and HgBa2Ca2Cu3O8+d crystals
• Nanoscale structural correlations in a model cuprate superconductor
• Strain-induced structural change and nearly-commensurate diffuse scattering in the model high-temperature superconductor HgBa${}_2$CuO${}_{4+\delta }$
• Pressure tuning of superconductivity independent of disorder in Tl${}_2$Ba${}_2$CaCu${}_2$O${}_{8+\delta }$