A Bianconi et al 2000 J. Phys.: Condens. Matter 12 10655 doi:10.1088/0953-8984/12/50/326
The stripe critical point for cuprates
A Bianconi1, G Bianconi2, S Caprara1, D Di Castro1, H Oyanagi3 and N L Saini1
Show affiliationsThe experimental determination of the quantum critical point (QCP) that triggers the self-organization of charged striped domains in cuprate perovskites is reported. The phase diagram of doped cuprate superconductors is determined by a first variable, the hole doping δ, and a second variable, the micro-strain ε of the Cu-O bond length, obtained from the Cu K-edge extended x-ray absorption fine structure. For a fixed optimum doping, δc = 0.16, we show the presence of the QCP for the onset of local lattice distortions and stripe formation at the critical micro-strain εc. The critical temperature Tc(ε,δ) reaches its maximum at the quantum critical point (εc,δc) for the formation of bubbles of superconducting stripes. The critical charge, orbital and spin fluctuations near this strain QCP provide the interaction for the pairing.
- PACS
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74.72.-h Cuprate superconductors (high-Tc and insulating parent compounds)
74.62.Dh Effects of crystal defects, doping and substitution
74.25.Dw Superconductivity phase diagrams
74.25.Ld Mechanical and acoustical properties, elasticity, and ultrasonic attenuation
- Subjects
- Dates
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Issue 50 (18 December 2000)
Received 21 September 2000, in final form 10 November 2000
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The stripe critical point for cuprates
A Bianconi et al 2000 J. Phys.: Condens. Matter 12 10655
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