Thermopower anisotropy of lightly-doped and optimally-doped Bi2Sr2−xLaxCaCu2O8+δ single crystals

Out-of-plane thermopower of strongly correlated layered systems: An application toBi2(Sr,La)2CaCuSilk1, Terasaki2, Fujii3 et al. 2009Phys. Rev. BSelf Cite140140View full textAdd to dashboardCite

“…Figure 3 shows S c and S ab for the parent ͑T =0͒ insulator Bi 2 ͑Sr, La͒ 2 CaCu 2 O 8 , reproduced from Ref. 17. Remarkably, the thermopower of the parent compound is nearly isotropic, which suggests that the mechanism of transport in the insulating state is the same in and out of plane.…”

“…5͑c͒. The monotonic increase in the entropy with temperature is very different from the in-plane thermopower 17 pendent of temperature and equal to p, the number of charge carriers per Cu. Figure 5͑c͒ shows that the ratio is nearly independent of temperature above around 100 K although deviates strongly as the transition is approached.…”

“…II we analyze experimental measurements of the c-axis thermopower in Bi2212 single crystals from Ref. [17]. The calculation of the c-axis thermopower is given in Sec.…”

Extreme Thermopower Anisotropy and Interchain Transport in the Quasi-One-Dimensional MetalLi0.9Mo6O17Cohn1, Moshfeghyeganeh2, Santos3 et al. 2014Phys. Rev. Lett.180120View full textAdd to dashboardCite

“…Much less is known about the TEP transverse to the planes or chains of such materials, partly because TEP measurements are difficult to perform in small single crystals for which the transverse transport directions have very small dimensions (e.g., thin platelet or needlelike habits). In the few compounds where transverse TEP measurements have been reported [13][14][15][16][17][18], high anisotropy has not been observed.…”

“…The nearly constant TEP at low-T is a characteristic of narrow-band hopping [34]. As for the increase in S c to very large values at higher T , it is instructive to compare with the behavior found for the interplane (c-axis) TEPs of the q2D metals [16,17], YBa 2 Cu 3 O 7 and Bi 2 Sr 2 CaCu 2 O 8 [ Fig. 1 (b)].…”