Normal-State Diamagnetism of Charged Bosons in Cuprate Superconductors

Abstract

Normal state orbital diamagnetism of charged bosons quantitatively accounts for recent highresolution magnetometery results near and above the resistive critical temperature T c of superconducting cuprates. Our parameter-free descriptions of normal state diamagnetism, T c , upper critical fields and specific heat anomalies unambiguously support the 3D Bose-Einstein condensation of preformed real-space pairs with zero off-diagonal order parameter above T c at variance with phase fluctuation scenarios of cuprates.

Bose–Einstein condensation of strongly correlated electrons and phonons in cuprate superconductors

“…Our CTQMC simulations show that with realistic values for the coupling constant, λ ≃ 1, and phonon frequencies, ω ≃ T (a) one can avoid overlap of pairs and get the bose-condensation temperature T c about the room temperature. We believe that the following recipe is worth investigating to look for room-temperature superconductivity [33]: There are strong arguments in favor of 3D bipolaronic BEC in cuprates [3] drawn using parameter-free fitting of experimental T c with BEC T c [41], unusual upper critical fields [42] and the specific heat [43], and, more recently normal state diamagnetism [44], the HallLorenz numbers [45,46], the normal state Nernst effect [47,48], and the giant proximity effect (GPE) [49] as discussed below.…”

“…More recently the model has been extended to high magnetic fields taking into account the magnetic pair-breaking of singlet bipolarons and the anisotropy of the energy spectrum [44].…”

Structural andTcinhomogeneities inherent to doping inLa2−xSrxMosqueira1, Cabo2, Vidal3 2009Phys. Rev. B2811670View full textAdd to dashboardCite

“…4,[16][17][18][19][20][21][22][23][24][25][26] Nevertheless, these authors propose very different origins for such anomalous precursor diamagnetism, including the presence of superconducting phase fluctuations up to the pseudogap temperature or the existence in the bulk of intrinsic inhomogeneities with short characteristic lengths, as those observed by using surface probes.…”

Superfluidity of strongly correlated bosons in two- and three-dimensional traps

“…20 Furthermore, the 3D CBG of spatially bound electron pairs (small bipolarons) is discussed in the context of high T c superconductivity in cuprates. [21][22][23][24] Finally, applications also extend to macroscopic 3D bosonic Coulomb systems in the inner regions of neutron stars (proton pairing) [25][26][27] and the core of helium white dwarfs.…”