Out-of-Plane Disorder Effects on the Energy Gaps and Electronic Charge Order in Bi₂Sr_1.7R_0.3CuO_6+δ (R = La and Eu)

Ultrafast transient reflectivity measurements of optimally doped Bi2+xSr2−xCaCu2O8+Toda1, Tsuchiya2, Oda3 et al. 2021Phys. Rev. B6220View full textAdd to dashboardCite

“…3(f), we also see that the temperature dependence of τ PG observed in the OPD sample with x = 0.25 is almost identical to that of the UD sample, as is the case for F PG th , suggesting that spatial inhomogeneity plays an important role in the enhancement of PG in the UD sample. This result corresponds well with the observations from the STM/STS of Bi2212, where the PG enhancement is correlated with spatial inhomogeneity [7,26,27].…”

“…3(d)]. Similar trends were observed in R-Bi2201 (R=Eu, La) using ARPES and STM/STS, where the PG energy was significantly enhanced by increasing the disorder (La → Eu) compared to the suppression of the SC gap, and the magnitude of the enhancement (suppression) of the PG (SC gap) is in good agreement with the underdoping of La-Bi2201 [24][25][26]. Note that in contrast to the Bi2201 case, the decrease in T c by x in the OPD Bi2212 is smaller than the decrease in T c in the UD sample, while the increase in T * in the disordered OPD is comparable to that in the UD.…”

“…In Bi-based cuprates, the PG can also be manipulated by controlling an out-of-plane disorder, which is caused by a substitution at Sr in the Sr-O plane by other atoms [22,23]. For example, in Bi 2 Sr 2−x R x CuO 6+δ (R-Bi2201), by the substitution of Sr with lanthanides (R) from La to Eu, the Fermi arc shrinks and the PG energy and its spatial inhomogeneity increase, as observed by ARPES and STM/STS, respectively [24][25][26]. The correlation between spatial inhomogeneities and the PG has also been observed through STM/STS experiments in Bi2212, wherein the PG energy gap is spatially inhomogeneous, unlike the spatially uniform SC gap [7,27,28].…”

Influence of the spatially inhomogeneous gap distribution on the quasiparticle current inc-axis junctions involvingd-wave superconductors with charge density waves

“…At the same time, the intentional replacement of La by Eu in Bi 2 Sr 1.7 R 0.3 CuO 6 δ + ( R-Bi2201, R = La or Eu) [76] leads to an additional out-of-plane disorder, which substantially influences the checkerboard CDW ordering there. This effect, being very interesting per se, is not covered by our approach.…”

“…A real problem consists in the 'soft' character of CDW manifestations, which is a result of the short-range or fluctuation-like CDW appearance and the crucial role of the intrinsic disorder in cuprates [62][63][64][65][66][67][68][69][70][71][72][73][74][75][76]. All those factors lead to wide distributions of the apparent energy gap values successfully felt by tunnel spectroscopy [68,[77][78][79][80][81][82][83][84].…”