Publications (3)41.46 Total impact
- [Show abstract] [Hide abstract] ABSTRACT: We compare the Nernst effect in stripe ordered Eu-doped La2-xSrxCuO4 (Eu-LSCO) and similarly hole-doped LSCO. We show that at high temperatures they have essentially the same temperature dependence, showing an upturn and sign change starting at a temperature Tnu. Relating Tnu to the pseudogap temperature T^, we present a general phase diagram for LSCO showing that T^ decreases as the doping increases until it is driven to zero within the superconducting dome. We compare the phase diagram and the T^ line to the similar ones of YBa2Cu3Oy shown in a recent study .  R. Daou et al., arXiv:0909.4430
- [Show abstract] [Hide abstract] ABSTRACT: The Nernst effect in metals is highly sensitive to two kinds of phase transition: superconductivity and density-wave order. The large, positive Nernst signal observed in hole-doped high-T(c) superconductors above their transition temperature (T(c)) has so far been attributed to fluctuating superconductivity. Here we report that in some of these materials the large Nernst signal is in fact the result of stripe order, a form of spin/charge modulation that causes a reconstruction of the Fermi surface. In La(2-x)Sr(x)CuO(4) (LSCO) doped with Nd or Eu, the onset of stripe order causes the Nernst signal to change from being small and negative to being large and positive, as revealed either by lowering the hole concentration across the quantum critical point in Nd-doped LSCO (refs 6-8) or by lowering the temperature across the ordering temperature in Eu-doped LSCO (refs 9, 10). In the second case, two separate peaks are resolved, respectively associated with the onset of stripe order at high temperature and superconductivity near T(c).
- Nature (1)
The University of Tokyo
Edo, Tōkyō, Japan
- Department of Advanced Materials Science