Reply to "Comment on `Anisotropic thermopower in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ab</mml:mi></mml:math>plane of an untwinned<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mro

Lowe, Andrew J.; Regan, S E; Ma, Howson

doi:10.1103/physrevb.47.15321

Cited by 10 publications

(4 citation statements)

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“…dergoing a weak singular decrease close to T c0 but remaining on the same order of magnitude as in the normal phase (Howson et al, 1990;Lowe et al, 1993;Ri et al, 1994). These and further similar experiments have sparked the interest in thermomagnetic phenomena beyond the superconducting state.…”

Section: Fluctuation Spectroscopy: Analysis Of Nernst Signal Measumentioning

confidence: 63%

Fluctuation spectroscopy: From Rayleigh-Jeans waves to Abrikosov vortex clusters

2018

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5 We define the FCP concentration in d-dimensional space. This means that it determines the number of pairs per volume in the 3D case, the number of pairs per unit square in the 2D case, and the number of pairs per unit length in 1D. Since both wires and films are actual objects in three dimensional space, we can approximate the 3D concentration of FCPs,Ñ (3) , byÑ (3) = N (1) /s 2 for wires, where s 2 is the wire cross-section andÑ (3) = N (2) /s for films, where s is the thickness of the film, respectively.

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Section: Fluctuation Spectroscopy: Analysis Of Nernst Signal Measumentioning

confidence: 63%

Fluctuation spectroscopy: From Rayleigh-Jeans waves to Abrikosov vortex clusters

2018

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“…In fact this provides a simple, and now widely accepted, explanation, in terms of the oxygen content inhomogeneities, of the S(T) anomalous peaks observed by different groups in Y-123 samples. [36,37] Until the results of Ref. 26, these anomalous S(T) peaks were attributed by various groups to different intrinsic, but not well settled, effects.…”

Section: Anomalous Peaks Of the Thermopower Around T C : A Brief Compmentioning

confidence: 99%

“…26, these anomalous S(T) peaks were attributed by various groups to different intrinsic, but not well settled, effects. [37,38] An example corresponding to the inhomogeneities sketched in Fig. 11(b) and (c), of the influence of the relative amplitude of the inhomogeneity domain on the effective (measured) thermopower peak is represented in Fig.…”

Section: Anomalous Peaks Of the Thermopower Around T C : A Brief Compmentioning

confidence: 99%

“…[26,36] This provides a simple explanation of the anomalous S(T) peaks observed by different groups and attributed in some cases to sophisticated but not well settled intrinsic mechanisms. [36][37][38] In this Section, we will summarize some of our results on the influence of T c -inhomogeneities on the in-plane magnetoconductivity in inhomogeneous HTSC crystals. We will also briefly comment on the thermopower anomalous peaks in YBCO samples with small oxygen content inhomogeneities.…”

Section: T C -Inhomogeneities Non-uniformly Distributedmentioning

confidence: 99%

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On the Interplay Between T c -Inhomogeneities at Long Length Scales and Thermal Fluctuations Around the Average Superconducting Transition in Cuprates

Vidal

Veira

Maza

et al. 2001

High-Tc Superconductors and Related Materials

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We review at an introductory and pedagogical level some aspects of the interplay between inhomogeneities at long length scales (at length scales much bigger than any characteristic length for superconductivity, in particular than the superconducting coherence length amplitude, ξ (T), even at temperatures relatively close to T c ) and the intrinsic fluctuations of Cooper pairs above T c in high temperature cuprate superconductors (HTSC). These inhomogeneities at long length scales do not directly affect the thermal fluctuations, but they may deeply affect, together (and entangled!) with the thermal fluctuations, the measured behaviour of any observable around the transition. The emphasis is centered on the role played by the presence of T cinhomogeneities, as those associated with oxygen content inhomogeneities, at these long length scales and uniformly or non-uniformly distributed in the samples, on the inplane transport properties in inhomogeneous HTSC crystals. For completeness, we will also summarize some results on this interplay when various types of inhomogeneities (i.e., structural and stoichiometric, uniformly and non-uniformly distributed) may be simultaneously present.Thouless for LTSC´s: After having indicated that the observed rounding of ρ (T) around T c in their LaSCO compounds may be due to inhomogeneities, Bednorz and Müller concluded that "the onset (of the ρ (T) drop) can also be due to fluctuations in the superconducting wave functions". In fact, mainly due to the smallness of the superconducting coherence length amplitudes (at 0 K), ξ (0), which are anisotropic but in all directions of the order of the interatomic distances, both effects, those associated with the intrinsic thermal fluctuations and those with the extrinsic inhomogeneities, may be very important in the HTSC. This is mainly due, in the case of the thermal fluctuations, to the fact that a small ξ (T) leads to a small coherent volume, which will contain very few strongly correlated Cooper pairs. These fluctuation effects are also enhanced by the layered nature of the HTSC, which may lead these materials to behave as quasi bi-dimensional superconductors (still reducing, then, their superconducting coherent volume) and their high T c , which increase then the available (gratis!) thermal agitation energy, of the order of k B T c (where k B is the Boltzmann constant) around their superconducting transition. [3] In the case of the inhomogeneities, the smallness of ξ (T) makes the different superconducting properties of these materials very sensitive to the presence of inhomogeneities, even when they have very small characteristic length, of the order of ξ (T). In addition, their layered nature and the complexity of their chemistry enhance the probability of the presence of extrinsic inhomogeneity effects in real HTSC compounds. When they are present at long length scales (i.e., at length scales much bigger than any characteristic length in the system, as the magnetic field penetration length or, mainly, the superconducting coherence le...

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Resistivity anomalies above the superconducting transition in Y1Ba2Cu3O7−δ crystals and non-uniformly distributed critical-temperature inhomogeneities

Mosqueira

Pomar

Díaz

et al. 1994

Physica C: Superconductivity

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Reply to "Comment on `Anisotropic thermopower in theabplane of an untwinnedYBa2Cu

Cited by 10 publications

References 0 publications

Fluctuation spectroscopy: From Rayleigh-Jeans waves to Abrikosov vortex clusters

Fluctuation spectroscopy: From Rayleigh-Jeans waves to Abrikosov vortex clusters

On the Interplay Between T c -Inhomogeneities at Long Length Scales and Thermal Fluctuations Around the Average Superconducting Transition in Cuprates

Resistivity anomalies above the superconducting transition in Y1Ba2Cu3O7−δ crystals and non-uniformly distributed critical-temperature inhomogeneities

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