Doping-dependent competition between superconductivity and polycrystalline charge density waves

Abstract

From systematic analysis of the high pulsed magnetic field resistance data of La 2−x Sr x CuO 4 thin films, we extract an experimental phase diagram for several doping values ranging from the very underdoped to the very overdoped regimes. Our analysis highlights a competition between charge density waves and superconductivity which is ubiquitous between x = 0.08 and x = 0.19 and produces the previously observed double step transition. When suppressed by a strong magnetic field, superconductivity is resilient for two specific doping ranges centered around respectively x ≈ 0.09 and x ≈ 0.19 and the characteristic temperature for the onset of the competing charge density wave phase is found to vanish above x = 0.19. At x = 1/8 the two phases are found to coexist exactly at zero magnetic field.

Charge Order and Suppression of Superconductivity in HgBa2CuO4+d at High Pressures

“…Our observations could be in a symmetric region of the p = 0.125 magical number with respect to the QCP, which remains to be understood. The pressure-induced destruction of filamentary superconductivity in analogy to experiments under strong magnetic fields [25] would also provide an explanation for our high-pressure results. Furthermore, the relation of our observations with the CDWs observed at lower temperatures [6,9] remains to be confirmed.…”

Turning charge-density waves into Cooper pairs

“…Obviously, the full picture of tuning the competition between the superconductivity and CDW should include the possible changes of such bosonic spectrum (e.g., phonons). Moreover, the role of the CDW fluctuations has to be clarified, since while the long-range ones definitely compete with superconductivity 36 , their quantum version may favor superconductivity 37,38 and suppress long-range CDW order 39 .…”

A brief review of the physical properties of charge density wave superconductor LaPt2Si2

“…SC appears in the case of pnictide superconductors at the boundary of magnetically ordered and non-ordered state [68][69][70]. The interplay between a CDW and SC has lately got renewed attention after the observation of interesting T-p phase diagram in high T c cuprate superconductors [71][72][73][74][75][76][77]. Recently, pressure-dependent transport studies in the sister compound of LaPt 2 Si 2 , i.e.…”