On the Electrical Conductivity of PrREBaCuO (RE = Er, Yb, Lu, Tm): Compounds in Orthorhombic Phase

Triberis, G. P.; Guskos, N.; Svoboda, P.; Vašek, P.; Emanova, D.; Koufoudakis, A.; Mitros, C.; Gamari‐Seale, H.; Niarchos, D.

doi:10.1002/pssb.2221710217

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…At low temperatures, the corresponding law is ln σ l ∝ T −1/4 . The behavior of the measured electrical conductivity of a variety of amorphous materials [28][29][30][31][32][33] has been consistently interpreted by various researchers applying these theoretical results. They also reported [26] that generally ln σ ∝ T − /( +r) .…”

Section: Introductionmentioning

confidence: 76%

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The effect of correlations on the non-ohmic behavior of the small-polaron hopping conductivity in 1D and 3D disordered systems

Dimakogianni

Triberis²

2010

J. Phys.: Condens. Matter

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According to percolation theory the investigation of charge transport in disordered systems is equivalent to the study of the possibility of the passage of the carriers through a random network of impedances which interconnect the different lattice sites. When the site energies are not the same, the energy of a site affects the incoming as well as the outgoing impedances connected to the given site and this gives rise to correlations between neighboring impedances. This new condition characterizes the transport process and imposes the evaluation of the average number of sites accessible by a bond from a given site for all possible configurations of sites that satisfy the percolation condition. The generalized molecular crystal model, appropriate for the study of small-polaron hopping transport in disordered systems, and the Kubo formula permit the evaluation of these impedances. Taking correlations into account, theoretical percolation considerations applicable to one-dimensional and three-dimensional disordered systems, lead to analytical expressions for the temperature and electric field dependence of the DC conductivity at high (multi-phonon-assisted hopping) and low (few-phonon-assisted hopping) temperatures. The theoretical analysis reveals the effect of correlations on the non-ohmic behavior of the small-polaron hopping conductivity and permits the evaluation of the maximum hopping distance. Quantitative estimates of this effect are presented comparing the theoretical results, including correlations with those ignoring them, previously reported, applying them to recent experimental data for a wide temperature range and from low up to moderate electric fields.

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Section: Introductionmentioning

confidence: 76%

“…For the temperature range of 120 up to 300 K we apply equation (30), for a representative value of the extent of the small-polaron wavefunction, i.e. α −1 = 2 Å [80,81].…”

Section: Resultsmentioning

confidence: 99%

The effect of correlations on the non-ohmic behavior of the small-polaron hopping conductivity in 1D and 3D disordered systems

Dimakogianni

Triberis²

2010

J. Phys.: Condens. Matter

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“…The agreement of the present experimental data for the non-HTC samples with the small polaron hopping model as well as that reported for the HTC samples [8] allows to attribute the conduction process in the orthorhombic phase of the (Pr, RE)-Ba-Cu-0 series to the hopping motion of thermally activated small polarons. Additionally, the behaviour of the resistivity of the PrBa,Cu, -xGax07-, system with to 0.6 in a wide temperature range has been consistently interpreted with the small polaron hopping model allowing the evaluation of the relevant physical parameters and giving a unified and meaningful explanation of the transport mechanism [4]. In contrast to the scepticism expressed by Radousky [lo] about the possibility of the explanation of the electrical conductivity process for the non-HTC Pr123 compounds we are now allowed to claim that the role of small polarons should be very important.…”

Section: Conductivity Measurementsmentioning

confidence: 97%

Low Temperature EPR Spectra of the (Pr, RE)BaCuO Ceramics in the Orthorhombic Phase

Guskos¹,

Likodimos²,

Patapis³

et al. 1994

Physica Status Solidi (b)

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) in the orthorhombic phase are investigated at low temperature. The EPR spectra arise from two different paramagnetic centers, one from divalent copper ions in orthorhombic local crystal field symmetry and another from exchange coupled pairs of copper ions whose origin is discussed. The EPR spectra essentially depend on the time exposition. The EPR spectra of some divalent and trivalent rare earth ions are recorded. The crystal field analysis is done for the trivalent ytterbium ions. The semiconducting behaviour of the dc conductivity can be attributcd to thcrmally activated small polaron hopping motion.

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XRD EPR studies of ceramics Pr0.5Re0.5Ba2Cu3O7?? in the orthorhombic and tetragonal phase

Guskos¹,

Lyvkodimos²,

Londos³

et al. 1992

J Supercond

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On the Electrical Conductivity of PrREBaCuO (RE = Er, Yb, Lu, Tm): Compounds in Orthorhombic Phase

Cited by 7 publications

References 20 publications

The effect of correlations on the non-ohmic behavior of the small-polaron hopping conductivity in 1D and 3D disordered systems

The effect of correlations on the non-ohmic behavior of the small-polaron hopping conductivity in 1D and 3D disordered systems

Low Temperature EPR Spectra of the (Pr, RE)BaCuO Ceramics in the Orthorhombic Phase

XRD EPR studies of ceramics Pr0.5Re0.5Ba2Cu3O7?? in the orthorhombic and tetragonal phase

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