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

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

2007-06-11

arxiv.org/abs/0706.1463v1

Phys. Rev. B 76, 020512(R) (2007)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.76.020512

In NdBa_2[Cu_{1-y}Ni_y]_3O_{7-\delta}, 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^\nu > Tc. For the optimally doped samples T^\nu and 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^\nu clearly does not track the enhanced pseudogap temperature T*.

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