Fluctuation conductivity of Tl-Ba-Ca-Cu-O thin films

Kim, D. H.; Goldman, A. M.; Kang, Joonhee; Gray, K. E.; Kampwirth, R. T.

doi:10.1103/physrevb.39.12275

Cited by 91 publications

(29 citation statements)

References 21 publications

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“…To evaluate the paraconductivity, we follow the procedure outlined in [37]. In this paper, it has been shown that a better fit may be obtained by evaluating the conductivity σ (T ),…”

Section: Resultsmentioning

confidence: 99%

Paraconductivity of the K-doped SrFe₂As₂superconductor

Marra

Nigro

et al. 2012

New J. Phys.

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Paraconductivity of the optimally K-doped SrFe2As2 superconductor is investigated within existing fluctuation mechanisms. The in-plane excess conductivity has been measured in high quality single crystals, with a sharp superconducting transition at Tc=35.5 K and a transition width less than 0.3 K. The data have been also acquired in external magnetic field up to 14 T. We show that the fluctuation conductivity data in zero field and for temperatures close to Tc, can be explained within a three-dimensional Lawrence-Doniach theory, with a negligible Maki-Thompson contribution. In the presence of the magnetic field, it is shown that paraconductivity obeys the three-dimensional Ullah-Dorsey scaling law, above 2 T and for H c. The estimated upper critical field and the coherence length nicely agree with the available experimental data.

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“…To evaluate the paraconductivity, we follow the procedure outlined in [37]. In this paper, it has been shown that a better fit may be obtained by evaluating the conductivity σ (T ),…”

Section: Resultsmentioning

confidence: 99%

Paraconductivity of the K-doped SrFe₂As₂superconductor

Marra

Nigro

et al. 2012

New J. Phys.

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“…The parameters obtained are compared with the parameters for YBa2Cu3Ov_y (Veira and Vida11989), T12122 (Krishnan 1990) and oriented thin film ofT12122 (Kim et al 1989). It is seen that the intragrain parameters C2g are comparable to the values 11-67 ~ Vidal (1989) 29.30 Krishnan (1990) 11…”

Section: Resultsmentioning

confidence: 78%

Fluctuation-induced excess conductivity in the compounds CaREBaCu3O7−y (RE=La and Sm)

et al. 1991

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The compounds CaREBaCu307_r (RE = La and Sm) are tetragonal at room temperature with T~ between 60 and 70 K. The single-phase compounds were prepared by solid-state reaction. The resistivity was measured by a four-probe technique in a continuous flow cryostat with the temperature being controlled to an accuracy of 10 mK. The resistivity vs temperature showed a break in slope around 180 K in CaLaBaCu30 7 _ r and around 220 K in CaSmBaCu3OT_r The results were analysed for fluctuation conductivity from 180K downwards. A plot ofdp/dT vs T showed a sharp peak at T,, = 69.69 K for La compound and 66.00 K for the Sm compound. Detailed analysis of the resistivity in the region To. to 180 K was carried out using the procedure due to Veira and Vidal. The results are discussed in this paper.

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“…On the other hand the crossover from 2D to 3D dimensional uctuation in the polycrystalline HgTl 1223 superconductors was also noticed [40]. The measurements of the conductivity of c-axis oriented TlBaCaCuO (1223) and (2212) thin lms in the paper [41] show only two-dimensional uctuations without crossover to 3D, whereas in TlBaCa CuO (2212) single crystals [42] the crossover from 2D to 3D was observed near the transition temperature in some samples. The critical exponents evaluated for the temperatures below T c (for instance, in the region III for the (Tl 0.5 Pb 0.5 )Sr 2 (Ca 0.8 Gd 0.2 )Cu 2 O y superconductor) characterize rather extrinsic behavior of the sample fabricated at certain preparation conditions but not the intrinsic physical properties of the superconducting material in general.…”

Section: Thermal Uctuationsmentioning

confidence: 93%