Amit Keren 2009 New J. Phys. 11 065006 doi:10.1088/1367-2630/11/6/065006
Evidence of magnetic mechanism for cuprate superconductivity
Focus on Superconductors with Exotic SymmetriesAmit Keren
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A proper understanding of the mechanism for cuprate superconductivity can emerge only by comparing materials in which physical parameters vary one at a time. Here, we present a variety of bulk, resonance and scattering measurements on the (CaxLa1−x) (Ba1.75−xLa0.25+x) Cu3Oy high temperature superconductors, in which this can be done. We determine the superconducting, Néel, glass and pseudopage critical temperatures. In addition, we clarify which physical parameter varies, and, equally important, which does not, with each chemical modification. This allows us to demonstrate that a single energy scale, set by the superexchange interaction J, controls all the critical temperatures of the system. J, in turn, is determined by the in plane Cu–O–Cu buckling angle.
- PACS
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74.62.Dh Effects of crystal defects, doping and substitution
74.25.Nf Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)
- Subjects
- Dates
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Issue 6 (June 2009)
Received 27 December 2008
Published 30 June 2009
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Evidence of magnetic mechanism for cuprate superconductivity
Amit Keren 2009 New J. Phys. 11 065006
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