English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Due to their proximity to an antiferromagnetic phase and to the mysteriouspseudogap, underdoped cuprates have attracted great interest in the high Tccommunity for many years. A central issue concerns the role of quantum andthermal fluctuations of the phase of the superconducting order parameter. Theevolution of superfluid density ns with temperature and doping is a powerfulprobe of this physics. Here, we report superfluid density measurements onunderdoped Bi2Sr2CaCu2O8+x (Bi-2212) films at much lower dopings than have beenachieved previously, and with excellent control on doping level - Tc rangesfrom Tc,min ~ 6K to Tc,max ~ 80K in steps of about 5K. Most famous studies onBi-2212 like angle-resolved photoemission and scanning probe microscopy aresurface-sensitive while superfluid density measurements are bulk-sensitive. Wefind that strong two-dimensional quantum fluctuations are evident in theobserved linear scaling of Tc with ns(0) when Tc is below about 45 K, whichcontrasts with three-dimensional quantum fluctuations evident in the squareroot scaling, Tc $\propto \sqrt$ns(0), seen in the much less anisotropiccuprate, YBa2Cu3O7 (YBCO). On the other hand, consistent with YBCO, ns(T) inseverely underdoped Bi-2212 loses its strong downward curvature near Tc,becoming quasi-linear without any obvious critical behavior near Tc. We arguethat the quasi-linear T dependence arises from thermal phase fluctuations,although the current theory needs modification in order to understand somefeatures.

Superfluid density in Bi2Sr2CaCu2O8+x from optimal doping to severe underdoping and its implications