Magnetoresistance of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors in the fluctuation regime

Bieri, J.B.; Maki, Kazumi

doi:10.1103/physrevb.42.4854

Cited by 61 publications

(40 citation statements)

References 14 publications

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“…An analysis within both the dirty and clean-limit phenomenological models revealed several inconsistencies regarding the resulting value for ¿ u [117,154,162,163]. This additional magnetoconductivity is suppressed in Zn-doped YBCO [6,117], partially Pr-substituted YBCO [179] and in the more impure compounds 2223-BSCCO [147,158] and oxygen-depleted YBCO [174].…”

Section: Dos¯uctuations In High T C Superconductors 727mentioning

confidence: 95%

“…To overcome the above-mentioned problems with the unknown transport properties of the normal-state in HTS, an analysis of the in-plane¯uctuation magnetoconductivity above Tc has been proposed [160,167]. Early studies of the in-plane¯uctuation magnetoconductivity on YBCO ceramics, thin ® lms, and single crystals [109, 117, 143, 154, 156, 157, 167± 173], in oxygen-de® cient YBCO with Tc = 55 K [174], 2212-BSCCO [146,149,151,173,175,176], 2223-BSCCO [147,158], Tl2Ba2CaCu2Ox [177], and La2 xSrxCuO4 [150] were interpreted within the then available phenomenological dirty-limit [160,161,165,178] and clean-limit theories [162] and reanalysed including non-local corrections [163].…”

Section: In-plane Magnetoresistancementioning

confidence: 99%

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The role of density of states fluctuations in the normal state properties of highT_csuperconductors

Varlamov

Balestrino

Milani

et al. 1999

Advances in Physics

144

112

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Section: Dos¯uctuations In High T C Superconductors 727mentioning

confidence: 95%

Section: In-plane Magnetoresistancementioning

confidence: 99%

The role of density of states fluctuations in the normal state properties of highT_csuperconductors

Varlamov

Balestrino

Milani

et al. 1999

Advances in Physics

144

112

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“…The at-present most complete microscopic theory 14 calculates several diagonal elements ii f l (T,B) for direct and indirect contributions and for arbitrary ratios of the mean-free-path and the coherence lengths. The formulas are valid between the clean and the dirty limit 15,8 approximations, and therefore account optimally for the situation in the cuprates, in particular for BSCCO. In this context only the orbital ͑O͒ contributions for Bʈc have been considered and spin interactions, i.e., the Zeeman ͑Z͒ effect, 16 were neglected.…”

mentioning

confidence: 99%

Positive in-plane and negative out-of-plane magnetoresistance in the overdoped high-temperature superconductorBi2Sr2
Heine
¹
,
Lang
²
,
Wang
³

et al. 1999
Phys. Rev. B
27
10
14
0
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“…Indeed, at r = 10 −4 , the ratio f (DOS) (ǫ = 0.002)/f (DOS) (ǫ = 0.01) ≃ 1.3 shows that the DOS contribution has not changed much in that temperature range while the corresponding ratio for aMT is f (aMT ) (ǫ = 0.002)/f (aMT ) (ǫ = 0.01) ≃ 5 for the same r and in the relevant range of γ φ . In other words, the logarithmic asymptotics (29) of the DOS diagram at r/ǫ → 0 wins over the power-law dependencies of the aMT term (33).…”

Section: Discussionmentioning

confidence: 99%

Superconducting fluctuation corrections to ultrasound attenuation in layered superconductors

2004

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We consider the temperature dependence of the sound attenuation and sound velocity in layered impure metals due to s-wave superconducting fluctuations of the order parameter above the critical temperature. We obtain the dependence on material properties of these fluctuation corrections in the hydrodynamic limit, where the electron mean free path ℓ is much smaller than the wavelength of sound and where the electron collision rate τ −1 is much larger than the sound frequency. For longitudinal sound propagating perpendicular to the layers, the open Fermi surface condition leads to a suppression of the divergent contributions to leading order, in contrast with the case of paraconductivity. The leading temperature dependent corrections, given by the Aslamazov-Larkin, Maki-Thompson and density of states terms, remain finite as T → Tc. Nevertheless, the sensitivity of new ultrasonic experiments on layered organic conductors should make these fluctuations effects measurable.PACS numbers: 74.25. Ld, 74.25.Fy, 74.40.+k The problem of fluctuations of the superconducting order parameter above the critical temperature began to attract the attention of researchers more than three decades ago. [1, 2, 3] Considerable work has been done from both the theoretical and experimental points of view. Conductivity, thermoconductivity, magnetoconductivity as well as tunneling properties and nuclear magnetic resonance characteristics are amongst the various transport phenomena where fluctuation contributions were predicted and experimentally observed. Ref. [4] contains an extensive review of the field and references.In the present paper, we concentrate on the superconducting fluctuation corrections to the sound velocity and sound attenuation in layered superconductors above T c . As usual, superconducting fluctuations manifest themselves in three different ways.[4] a) The effective number of normal carriers is reduced because some of the electrons exist as transient Cooper pairs. This is the so-called density of states contribution. b) The single-particle excitations are Andreev reflected off the superconducting fluctuations, as described by the so-called Maki-Thompson term. c) Some of the electrons behave like Cooper pairs for a time given by the Ginzburg-Landau time. This is the famous AslamazovLarkin contribution. Layered organic superconductors, in particular, are an ideal class of materials to study fluctuation phenomena. This is because the relatively low charge-carrier concentration and the strong electronic anisotropy enhance the effect of superconducting fluctuations and increase the size of the fluctuation regime. The manifestation of superconducting fluctuations in organic materials was found in a number of experimental works on dc-magnetoconductivity, thermoconductivity, ac-susceptibility, specific heat and torque magnetometry. [5] Preliminary ultrasonic experiments in the κ-phase layered organic materials [6] (BEDT-Cl and (BEDT-TTF) 2 Cu(NCS) 2 suggest that the sound attenuation coefficient is decreased by superconducting...

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Magnetoresistance of high-Tcsuperconductors in the fluctuation regime

Cited by 61 publications

References 14 publications

The role of density of states fluctuations in the normal state properties of highT_csuperconductors

The role of density of states fluctuations in the normal state properties of highT_csuperconductors

Positive in-plane and negative out-of-plane magnetoresistance in the overdoped high-temperature superconductorBi2Sr2
Heine
¹
,
Lang
²
,
Wang
³

et al. 1999
Phys. Rev. B
27
10
14
0
View full text Add to dashboard Cite

Superconducting fluctuation corrections to ultrasound attenuation in layered superconductors

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Magnetoresistance of high-Tcsuperconductors in the fluctuation regime

Cited by 61 publications

References 14 publications

The role of density of states fluctuations in the normal state properties of highTcsuperconductors

The role of density of states fluctuations in the normal state properties of highTcsuperconductors

Positive in-plane and negative out-of-plane magnetoresistance in the overdoped high-temperature superconductorBi2Sr2Heine1, Lang2, Wang3 et al. 1999Phys. Rev. B2710140View full textAdd to dashboardCite

Superconducting fluctuation corrections to ultrasound attenuation in layered superconductors

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The role of density of states fluctuations in the normal state properties of highT_csuperconductors

The role of density of states fluctuations in the normal state properties of highT_csuperconductors

Positive in-plane and negative out-of-plane magnetoresistance in the overdoped high-temperature superconductorBi2Sr2
Heine
¹
,
Lang
²
,
Wang
³

et al. 1999
Phys. Rev. B
27
10
14
0
View full text Add to dashboard Cite