Evolution of the resistivity of single-layer Bi2Sr1.6La0.4CuOy thin films with doping and phase diagram

Konstantinović, Z.; Li, Z.Z.; Raffy, H.

doi:10.1016/s0921-4534(00)01733-0

Cited by 48 publications

(66 citation statements)

References 38 publications

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“…The value of α giving a straight line over the largest temperature interval ( 25K<T<230K) is equal to α = (0.18±0.02). A hopping behaviour of the conduction is also observed for a film on KTO cooled down under gas process (see Fig.1) as well as for a strongly deoxidized hole-doped Bi 2 Sr 1.6 La 0.4 CuO y thin film [13]. The first heat treatment produces a dramatic decrease of the resistance at 300 K, R 300K , which will continue to monotonically decrease after each treatment.…”

Section: Evolution Of a Sr 1-x La X Cuo 2 Film On Dso Substratementioning

confidence: 64%

“…The first heat treatment produces a dramatic decrease of the resistance at 300 K, R 300K , which will continue to monotonically decrease after each treatment. After the third treatment, the low temperature behaviour of the resistance changes from insulating-like by sequential de-oxidation [13] and also under 60 Teslas in Bi(La)-2201 single crystals [16] close to the SIT transition. Starting from step 3, T c increases with increasing treatment index i for 3 ≤i< 13.…”

Section: Evolution Of a Sr 1-x La X Cuo 2 Film On Dso Substratementioning

confidence: 99%

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Influence of oxygen reduction on the structural and electronic properties of electron-doped Sr1−xLaxCuO2 thin films

Jovanović

Raffy

et al. 2009

Physica C: Superconductivity

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Single phase, c-axis oriented, e-doped, Sr 1-x La x CuO 2 thin films were epitaxially grown on KTaO 3 and DyScO 3 substrates by reactive rf sputtering. As-grown films being insulating due to oxygen excess, oxygen reduction is necessary to observe superconductivity. Two different procedures were employed to reach superconductivity.On one hand an in-situ reduction process was conducted on a series of films deposited on both types of substrates. On the other hand, an ex-situ reduction procedure was performed sequentially on a single film deposited on DyScO 3 . The study of the influence of oxygen reduction on the structural and electronic properties of the thin films is presented and discussed.

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Section: Evolution Of a Sr 1-x La X Cuo 2 Film On Dso Substratementioning

confidence: 64%

Section: Evolution Of a Sr 1-x La X Cuo 2 Film On Dso Substratementioning

confidence: 99%

Influence of oxygen reduction on the structural and electronic properties of electron-doped Sr1−xLaxCuO2 thin films

Jovanović

Raffy

et al. 2009

Physica C: Superconductivity

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“…In the case of 15K sample, the non-metallic behavior is absent at low fields but sets in at 12T, indicative of a higher doping level. Using the critical temperature and the roomtemperature resistivity of these samples, one can make a very rough estimate of doping level by comparing them with values obtained in systematic studies of doping dependence of resistivity [17,18] and thermopower [19]. This yields δ ∼ 0.08 for the 9K sample and δ ∼ 0.09 for the 15K sample.…”

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

Capan

Behnia

et al. 2003

Phys. Rev. B

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We present a comparative study of Nernst effect and resistivity in underdoped samples of Bi2Sr2CuO 6+δ and La2−xSrxCuO4. The Nernst effect presents a peak in a region of the H-T diagram where resistivity shows a non-metallic temperature dependence. Our results illustrate that the mechanism of dissipation in the mixed state of underdoped cuprates is poorly understood. Large quantum superconducting fluctuations and vanishing vortex viscosity are among suggested explanations for an enhanced Nernst signal close to the superconductor-insulator boundary.PACS numbers: 72.15. Jf, 74.25.Fy, 74.40.+k, 74.60.Ge Recently, the peculiar behavior of Nernst effect in copper oxide superconductors has become a subject of growing attention [1,2,3,4,5,6,7,8,9]. In conventional superconductors, Nernst effect, namely the transverse component of the thermopower in a magnetic field, is known to be associated with vortex movement [10]. However, Xu et al. [1] reported that in underdoped La 2−x Sr x CuO 4 a large residual signal persists in the normal state and well above T c . This observation has been confirmed in other families of cuprate superconductors including Bi 2 Sr 2 CuO 6+δ and YBa 2 Cu 3 O 6+y [2,3]. The normalstate Nernst signal is present over a wide doping range, but attenuates as one moves towards the superconductorinsulator boundary or the overdoped regime in the phase diagram [2]. Remarkably, the temperature scale up to which such an anomalous Nernst signal extends is about 130K, regardless of the particular system studied. Moreover, the Nernst signal is found to persist at magnetic fields as high as 30T both in overdoped [3] and in underdoped [4] compounds.The debate on the origin of this residual Nernst signal in the normal state of underdoped cuprates is still open and has stimulated a number of theoretical works during the past months. Fluctuations of the superconducting order parameter above T c are considered to be the most plausible explanation for such a signal. Ussishkin, Sondhi and Huse [5], for example, used a TimeDependent-Ginzburg-Landau(TDGL) approach. Within gaussian approximation and subtracting magnetization currents, they found a sizeable Nernst signal due to superconducting fluctuations. Weng and Muthukumar [7] have suggested that in a Resonant-Valence-Bond(RVB) picture, the coupling of spinon vortices to holons, can give rise to an enhanced Nernst effect above T c in the so-called spontaneous vortex phase. A different route has been taken by Kontani[6] who calculated Nernst coefficient beyond the Relaxation Time Approximation. By taking a self-consistent account of vertex corrections for currents, he found that the quasi-particle contribution to Nernst effect is no longer negligible in presence of antiferromagnetic and superconducting fluctuations. These studies point to the presence of strong superconducting fluctuations in the pseudogap regime and suggest that the superconducting transition is not a meanfield transition[11] but rather a vortex-antivortex unbinding type of transition [12]. It is ...

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“…The temperature dependence of the resistivity is one of the normal-state property which points out to unusual electronic structure in cuprates. It was observed in Bi 2 Sr 2 CaCu 2 O y [2,3] and Bi 2 Sr 1 . 6 La 0.…”

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confidence: 90%

Observation of the superconducting-insulating transition in a BiSr(La)CuO thin film tuned by varying the oxygen content

Matei

Raffy

2009

J. Phys.: Conf. Ser.

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We have conducted a highly precise doping controlled experiment on a thin film of the single layer cuprate Bi 2 Sr 2-x La x CuO y (x = 0.6), in order to observe the superconducting insulating transition (SIT). Sr 2+ /La 3+ substitution (x = 0.6) allowed us to start from a doping state in the vicinity of the SIT, which was further finely-tuned by varying the oxygen content in very small amounts through a vacuum anneal process. Measurements of the Hall effect at 300K and of the resistance vs. T, R(T), have been performed after each treatment. Approaching the SIT from the metallic side, and with decreasing T, R(T) exhibits a high T metallic behaviour down to a temperature T min , followed by a non metallic increase (dR/dT< 0) up to a maximum at T p before the superconducting transition at T c . This re-entrant behaviour in R(T), commonly observed in cuprates close to the SIT, is attributed to a phase segregation phenomenon in the presence of strong electronic correlations and inhomogeneities. We present our results extracted from R(T) and Hall effect studies in the region close to the SIT and in the insulating region. A phase diagram shows the characteristic temperatures versus doping.

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Evolution of the resistivity of single-layer Bi2Sr1.6La0.4CuOy thin films with doping and phase diagram

Cited by 48 publications

References 38 publications

Influence of oxygen reduction on the structural and electronic properties of electron-doped Sr1−xLaxCuO2 thin films

Influence of oxygen reduction on the structural and electronic properties of electron-doped Sr1−xLaxCuO2 thin films

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

Observation of the superconducting-insulating transition in a BiSr(La)CuO thin film tuned by varying the oxygen content

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