Nernst Effect in NdBa_2[Cu_{1-y}Ni_y]_3O_{7-δ}

Abstract

In NdBa_2[Cu_{1-y}Ni_y]_3O_{7-δ}, magnetic Ni-impurities suppress Tc but at the same time the pseudogap is strongly enhanced. This unique feature makes it an ideal system to study possible relations between the anomalous Nernst effect, superconductivity and the pseudogap. We present Nernst effect measurements on a series of optimally doped (O_7) and underdoped (O_{6.8}) samples with Ni contents ranging from y=0 to 0.12. In all samples an onset of the Nernst signal is found at T^ν> Tc. For the optimally doped samples T^νand Tc decrease simultaneously with increasing Ni content. The underdoped samples show a different behavior, i.e. the onset of the Nernst signal is hardly affected by increasing the Ni content from y=0 to 0.03. Irrespective of the oxygen content, T^νclearly does not track the enhanced pseudogap temperature T*.

References in corpus (11)

• Hidden Order in the Cuprates
• The Nernst effect in high-$T_c$ superconductors
• Theory of Underdoped Cuprates
• Interplay of magnetism and high-Tc superconductivity at individual Ni impurity atoms in Bi2Sr2CaCu2O8+d
• The onset of the vortex-like Nernst signal above Tc in La_{2-x}Sr_xCuO_4 and Bi_2Sr_{2-y}La_yCuO_6
• Nernst effect and disorder in the normal state of high-T_{c} cuprates
• Nernst effect, quasiparticles, and d-density waves in cuprates
• Ni impurity induced enhancement of the pseudogap in cuprate high T_c superconductors
• Temperature variation of the pseudogap in underdoped cuprates
• Nernst Effect and Superconducting Fluctuations in Zn-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$
• Correlation between incoherent phase fluctuations and disorder in Y${}_{1-x}$Pr${}_x$Ba${}_2$Cu${}_3$O${}_{7-\delta }$ epitaxial films from Nernst effect measurements

Cited by in corpus (6)

• Anisotropic superconductivity in the two-dimensional electron-phonon system
• The toy model for the high-Tc superconductivity
• Enhancement of superconducting fluctuation under the coexistence of a competing pseudogap state in Bi2Sr2-xRxCuOy
• Magneto-thermal evidence of a partial gap at the Fermi surface of UPt_2Si_2
• Resistance noise in Bi_2Sr_2CaCu_2O${}_{8+\delta }$
• Precursor superconducting diamagnetism in YBa2Cu3O7-d with in-plane or intercalated magnetic impurities