Anomalous dissipation in the mixed state of underdoped cuprates close to the superconductor-insulator boundary

Capan, C.; Behnia, Kamran; Li, Z. Z.; Raffy, H.; Marı́n, C.

doi:10.1103/physrevb.67.100507

Cited by 27 publications

(32 citation statements)

References 28 publications

(34 reference statements)

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“…This means that H * c2 (T ) is not a linear function of ǫ as assumed in Eq. (5) and that it exhibits an upward curvature. This may be seen using the full expression in Eq.…”

Section: Crossover Fieldmentioning

confidence: 91%

Upper critical field from normal state fluctuations inBi2Sr2CuO6+δ

et al. 2006

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The in-plane magnetoresistance of an epitaxial Bi2Sr2CuO 6+δ thin film was systematically investigated as a function of doping, above Tc. The orbital magnetoconductance is used to extract the crossover field line H * c2 (T ) in the fluctuation regime. This field is found in good agreement with the upper critical field obtained from resistivity data below Tc, and exhibits a similar upward curvature, thus pointing toward the existence of a critical correlation length. The consequences regarding the nature of the resistive transition are discussed.

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“…This means that H * c2 (T ) is not a linear function of ǫ as assumed in Eq. (5) and that it exhibits an upward curvature. This may be seen using the full expression in Eq.…”

Section: Crossover Fieldmentioning

confidence: 91%

Upper critical field from normal state fluctuations inBi2Sr2CuO6+δ

et al. 2006

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“…Early measurements of Nernst effect in the high-T c cuprates performed in the nineties, apart from a few exceptions [9], focused on vortex dynamics. These studies were complemented by new ones probing the anomalous Nernst response of the pseudogap state [10,11,12,13,14,15,16,17]. This has been the subject of a review by Wang, Li and Ong [18].…”

Section: Introductionmentioning

confidence: 99%

The Nernst effect and the boundaries of the Fermi liquid picture

Behnia

2009

J. Phys.: Condens. Matter

180

240

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Abstract. Following the observation of an anomalous Nernst signal in cuprates, the Nernst effect was explored in a variety of metals and superconductors during the past few years. This paper reviews the results obtained during this exploration focusing on the Nernst response of normal quasi-particles as opposed to the one generated by superconducting vortices or by short-lived Cooper pairs. Contrary to what has been often assumed, the so-called Sondheimer cancellation does not imply a negligible Nernst response in a Fermi liquid. In fact, the amplitude of the Nernst response measured in various metals in the low-temperature limit is scattered over six orders of magnitude. According to the data, this amplitude is roughly set by the ratio of electron mobility to Fermi energy in agreement with the implications of the semi-classical transport theory.

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“…It is argued that the magnitude and the behavior of the Nernst signal observed experimentally in disordered superconducting films can be well-understood on the basis of the superconducting fluctuation theory. PACS numbers: 74.40.+k, 74.25.Fy, 72.15.Jf A series of recent experimental studies has revealed an anomalously strong thermomagnetic signal in the normal state of the high-temperature superconductors [1,2,3,4,5,6,7,8,9] and disordered superconducting films [10,11]. In the pioneering experiment [1], Xu et al observed a sizeable Nernst effect in the La 2−x Sr x CuO 4 compounds up to 130 K, well above the transition temperature, T c .…”

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confidence: 99%

Giant Nernst Effect due to Fluctuating Cooper Pairs in Superconductors

Serbyn

Skvortsov

Varlamov³

et al. 2009

Phys. Rev. Lett.

155

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A theory of the fluctuation-induced Nernst effect is developed for arbitrary magnetic fields and temperatures beyond the upper critical field line in a two-dimensional superconductor. First, we derive a simple phenomenological formula for the Nernst coefficient, which naturally explains the giant Nernst signal due to fluctuating Cooper pairs. The latter is shown to be large even far from the transition and may exceed by orders of magnitude the Fermi liquid terms. We also present a complete microscopic calculation (which includes quantum fluctuations) of the Nernst coefficient and give its asymptotic dependencies in various regions on the phase diagram. It is argued that the magnitude and the behavior of the Nernst signal observed experimentally in disordered superconducting films can be well-understood on the basis of the superconducting fluctuation theory. PACS numbers: 74.40.+k, 74.25.Fy, 72.15.Jf A series of recent experimental studies has revealed an anomalously strong thermomagnetic signal in the normal state of the high-temperature superconductors [1,2,3,4,5,6,7,8,9] and disordered superconducting films [10,11]. In the pioneering experiment [1], Xu et al. observed a sizeable Nernst effect in the La 2−x Sr x CuO 4 compounds up to 130 K, well above the transition temperature, T c . This and further similar experiments on the cuprates have sparked theoretical interest in the thermomagnetic phenomena. Theoretical approaches to the anomalously large Nernst-Ettingshausen effect currently include models based on the proximity to a quantum critical point [12], vortex motion in the pseudogap phase [2,13,14], as well as a superconducting fluctuation scenario [15,16,17]. While the two former theories are specific to the cuprate superconductors, the latter scenario should apply to other more conventional superconducting systems as well. Very recently, a large Nernst coefficient was observed in the normal state of disordered superconducting films [10,11]. These superconducting films are likely to be well-described by the usual BCS model and, hence, the new experimental measurements provide indication that the superconducting fluctuations are likely to be the key to understanding the underlying physics of the giant thermomagnetic response.Various groups have previously calculated the fluctuationinduced Nernst coefficient in the vicinity of the classical transition [15,16,17,18,19]. However, these analyses were limited to the case of very weak magnetic fields and temperatures close to the zero-field transition, when Landau quantization of the fluctuating Cooper pair motion can be neglected. In experiment, however, other parts of the phase diagram (in particular strong fields) are obviously important and how the quantized motion of fluctuating pairs would figure into the thermomagnetic response has remained unclear. In this Letter we clarify this physics, explaining the origin of the giant fluctuation Nernst-Ettingshausen effect, and develop a complete microscopic theory of Gaussian superconducting fluctuations at arbi...

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Anomalous dissipation in the mixed state of underdoped cuprates close to the superconductor-insulator boundary

Cited by 27 publications

References 28 publications

Upper critical field from normal state fluctuations inBi2Sr2CuO6+δ

Upper critical field from normal state fluctuations inBi2Sr2CuO6+δ

The Nernst effect and the boundaries of the Fermi liquid picture

Giant Nernst Effect due to Fluctuating Cooper Pairs in Superconductors

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