Nernst effect in the electron-doped cuprates
نویسندگان
چکیده
We calculate the normal state Nernst signal in the cuprates resulting from a reconstruction of the Fermi surface due to spin density wave order. An order parameter consistent with the reconstruction of the Fermi surface detected in electron-doped materials is shown to sharply enhance the Nernst signal close to optimal doping. Within a semiclassical treatment, the obtained magnitude and position of the enhanced Nernst signal agrees with Nernst measurements in electron-doped cuprates. Our result is mainly caused by the role of Fermi surface geometry under influence of a spin density wave gap. We discuss also possible roles of short-ranged magnetic order in the normal state Nernst effect and the Fermi surface reconstruction observed by photoemission spectroscopy.
منابع مشابه
Title of Dissertation: SPECIFIC HEAT AND NERNST EFFECT OF ELECTRON-DOPED CUPRATE SUPERCONDUCTORS
Title of Dissertation: SPECIFIC HEAT AND NERNST EFFECT OF ELECTRON-DOPED CUPRATE SUPERCONDUCTORS Hamza Balci, Doctor of Philosophy, 2004 Dissertation directed by: Professor Richard L. Greene Department of Physics This thesis consists of two separate studies on Pr2−xCexCuO4 (PCCO), a member of the electron-doped high temperature cuprate superconductor family: specific heat and the Nernst effect....
متن کاملNernst Effect in Electron-doped Pr 2−x Ce X Cuo 4
The Nernst effect of Pr 2−x Ce x CuO 4 (x=0.13, 0.15, and 0.17) has been measured on thin film samples between 5-120 K and 0-14 T. In comparison to recent measurements on hole-doped cuprates that showed an anomalously large Nernst effect above the resistive T c and H c2 [1–4], we find a normal Nernst effect above T c and H c2 for all dopings. The H c2 (T) determined from the Nernst effect shows...
متن کاملعدم تقارن الکترون-حفره در کوپراتهای دمای بالا از دید نظری
Asymmetric features of various physical quantities in the normal and superconducting states between hole- and electron-doped cuprate high-temperature superconductors have been an issue of debate for a long time. Their exploration is very important for the understanding not only of the mechanism of high-Tc superconductivity but also of the nature of doped-Mott insulators. Presented in this rev...
متن کاملSpin dynamics of the electron-doped high-T(c) superconducting cuprates.
We show that a basic difference between the electron- and hole-doped cuprates is their proximity to two different quantum critical points in a 2D free fermion system on a square lattice and that the spin dynamics observed recently for the first time in the electron-doped Nd2-xCexCuO4, very different from that in the hole-doped cuprates, can be understood as a consequence of this effect.
متن کاملQuestioning the Universality of the Charge Density Wave Nature in Electron- doped Cuprates
Since the discovery of unconventional high-temperature superconductivity (HTSC) in cuprates, one of the central questions in high Tc research is the nature of the “normal state” which develops into HTSC. As one of the pursuits of normal state properties, the recent observation of charge density wave (CDW) order is expected to shed light on the nature of the competing phases in high Tc cuprates....
متن کامل