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Jin, Ran; Ott, H. R.

doi:10.1103/physrevb.57.13872

Cited by 34 publications

(35 citation statements)

References 42 publications

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“…The peak in R H around 100 K has been attributed to the change in the T 2 dependence of cotθ. Many studies have suggested that the peak in R H or the change of cot(θ)(T ) is also associated with the opening of the pseudogap 26,33,34,35,36 , but T 1 usually falls between T c and T * (determined from ρ(T )). For our Zn doped YBCO samples, cotθ in normal state can be fitted by the function a + bT n with n close to 2.…”

Section: Resultsmentioning

confidence: 99%

Nernst effect and superconducting fluctuations in Zn-dopedYBa2Cu3O7−δ

Shen

Zhao

et al. 2005

Phys. Rev. B

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We report the measurements of in-plane resistivity, Hall effect, and Nernst effect in Zn doped YBa2Cu3O 7−δ epitaxial thin films grown by pulsed laser deposition technique. The pseudogap temperature, T * , determined from the temperature dependence of resistivity, does not change significantly with Zn doping. Meanwhile the onset temperature (T ν ) of anomalous Nernst signal above Tc0, which is interpreted as evidence for vortex-like excitations, decreases sharply as the superconducting transition temperature Tc0 does. A significant decrease in the maximum of vortex Nernst signal in mixed state is also observed, which is consistent with the scenario that Zn impurities cause a decrease in the superfluid density and therefore suppress the superconductivity. The phase diagram of T * , T ν , and Tc0 versus Zn content is presented and discussed.

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Section: Resultsmentioning

confidence: 99%

Nernst effect and superconducting fluctuations in Zn-dopedYBa2Cu3O7−δ

Shen

Zhao

et al. 2005

Phys. Rev. B

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“…51 At the same time it was pointed out in Ref. 40 that pinning effects cannot be the only reason for the Hall anomaly for YBCO single crystals. All these controversial results show that more work is necessary for better understanding of the mixed-state Hall effect and the influence of disorder on it.…”

Section: Regimesmentioning

confidence: 99%

“…[35][36][37][38] Experimentally the pronounced influence of the doping level on the sign of the Hall voltage close to T c was observed for various high-T c cuprates. 40,41 The sign reversal of the Hall effect disappears for heavily underdoped 40 and strongly overdoped 41 …”

Section: Introductionmentioning

confidence: 99%

Hall effect inLuNi2B2Cand<

et al. 1999

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The Hall effect in LuNi2B2C and YNi2B2C borocarbides has been investigated in normal and superconducting mixed states. The Hall resistivity ρxy for both compounds is negative in the normal as well as in the mixed state and has no sign reversal below Tc typical for high-Tc superconductors. In the mixed state the behavior of both systems is quite similar. The scaling relation ρxy ∼ ρ β xx (ρxx is the longitudinal resistivity) was found with β = 2.0 and 2.1 for annealed Luand Y-based compounds, respectively. The scaling exponent β decreases with increasing degree of disorder and can be varied by annealing. This is attributed to a variation of the strength of flux pinning. In the normal state weakly temperature dependent Hall coefficients were observed for both compounds. A distinct nonlinearity in the ρxy dependence on field H was found for LuNi2B2C in the normal state below 40 K, accompanied by a large magnetoresistance (MR) reaching +90% for H = 160 kOe at T = 20 K. At the same time for YNi2B2C only linear ρxy(H) dependences were observed in the normal state with an approximately three times lower MR value. This difference in the normal state behavior of the very similar Lu-and Y-based borocarbides seems to be connected with the difference in the topology of the Fermi surface of these compounds.

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“…However if transport relaxation time is dependent on temperature differently from point to point on the Fermi surface, the Hall coefficient can depend on temperature. In the normal state of hole-doped cuprate superconductors [3][4][5][6][7][8][9][10], the sign of the Hall coefficient is positive, and the Hall coefficient decreases as the temperature increases for a wide temperature range. Hole-like character of the Fermi surface has been observed by angle-resolved photoemission spectroscopy (ARPES) experiments [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Theory of Hall Effect and Electrical Transport in High-T_cCuprates: Effects of Antiferromagnetic Spin Fluctuations

Kanki

Kontani

1999

J. Phys. Soc. Jpn.

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In the normal state of high-Tc cuprates, the Hall coefficient shows remarkable temperature dependence, and its absolute value is enhanced in comparison with that value simply estimated on the basis of band structure. It has been recognized that this temperature dependence of the Hall coefficient is due to highly anisotropic quasiparticle damping rate on the Fermi surface. In this paper we further take account of the vertex correction to the current vertex arising from quasiparticle interactions. Then the transport current is transformed to a large extent from the quasiparticle velocity, and is no longer proportional to the latter. As a consequence some pieces of the Fermi surface outside of the antiferromagnetic Brillouin zone make negative contribution to the Hall conductivity, even if the curvature of the Fermi surface is hole-like. The Hall coefficient is much larger at low temperatures than the estimate made without the vertex correction. Temperature dependence of the antiferromagnetic spin correlation length is also crucial to cause remarkable temperature dependence of the Hall coefficient. In our treatment the Hall coefficient of the electron-doped cuprates can be negative despite hole-like curvature of the Fermi surface.

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Hall effect ofYBa2Cu3O7−

Cited by 34 publications

References 42 publications

Nernst effect and superconducting fluctuations in Zn-dopedYBa2Cu3O7−δ

Nernst effect and superconducting fluctuations in Zn-dopedYBa2Cu3O7−δ

Hall effect inLuNi2B2Cand<

Theory of Hall Effect and Electrical Transport in High-T_cCuprates: Effects of Antiferromagnetic Spin Fluctuations

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Hall effect ofYBa2Cu3O7−

Cited by 34 publications

References 42 publications

Nernst effect and superconducting fluctuations in Zn-dopedYBa2Cu3O7−δ

Nernst effect and superconducting fluctuations in Zn-dopedYBa2Cu3O7−δ

Hall effect inLuNi2B2Cand<

Theory of Hall Effect and Electrical Transport in High-TcCuprates: Effects of Antiferromagnetic Spin Fluctuations

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Theory of Hall Effect and Electrical Transport in High-T_cCuprates: Effects of Antiferromagnetic Spin Fluctuations