Incoherent superconductivity well above in high- cuprates—harmonizing the spectroscopic and thermodynamic data
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Transcript: English(auto-generated)
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Hi, I'm James Storey from the Robinson Research Institute at Victoria University of Wellington here in New Zealand, and today I'd like to introduce you to my paper, Incoherent Superconductivity Well Above TC in High-TC Coupe Rates, Harmonising the Spectroscopic
00:22
and Thermodynamic Data. This work was supported by the Marsden Fund. This paper addresses a decades-long dispute concerning the origin of a partial energy gap in copper oxide-based high-temperature superconductors.
00:42
This energy gap is known as the pseudogap. Typically, when a material is cooled below its superconducting transition temperature, or TC, an energy gap opens, and we call this gap the superconducting gap. The pseudogap, on the other hand, is unusual because it extends far above the superconducting
01:05
transition temperature. We study the pseudogap to determine its relevance to high-temperature superconductivity. Roughly speaking, there are two possibilities which can be distinguished by their temperature-doping
01:21
phase diagrams. The first is that the pseudogap is a precursor to the superconducting gap, and arises from phase-incoherent superconducting correlations. Here, the boundary of the pseudogap phase merges smoothly with the superconducting TC dome.
01:42
The alternative picture is that the pseudogap is unrelated to the superconducting gap, and coexists and competes with superconductivity. In this case, the pseudogap phase opens below a critical doping point inside the superconducting dome.
02:01
The problem we have is that there is considerable experimental support for both phase diagrams. To sort this out, I modelled a range of physical properties focusing on the slightly overdoped region near TC.
02:21
Here, any competing order gap should be absent. I found that a superconducting gap extending above TC, combined with a steep increase in pair-breaking scattering, simultaneously explains the unusual temperature dependencies observed
02:41
by five different experimental techniques. These have long defied explanation in terms of conventional mean field theories. Incorporating this result with existing evidence for a competing order gap at lower dopings, I conclude that the phase diagram is a blend of the two leading proposals, with both precursor
03:05
pairing and competing order elements. But note, at high dopings, the gap above TC originates from the superconducting gap. The superconducting transition seems to be governed by a strong increase in pair-breaking
03:24
scattering near TC. This is fundamentally different to what happens in conventional low-temperature superconductors, where the superconducting gap closes at TC and scattering is small. Strongly temperature-dependent scattering is expected to occur when superconductivity
03:43
is coupled to spin fluctuations, hinting that this might be the cause of superconductivity in these materials. I hope to look into this further in future work. Thanks for watching.