TC-xPhase Diagrams and Infrared Spectra Due to Axial Charge-Transfer Modes in La2-xSrxCuO4: a Composite-Boson Model

Mihailov, L.M.; Ivanovich, M.; Georgiev, M.

doi:10.1143/jpsj.62.2431

Cited by 9 publications

(8 citation statements)

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“…The crossover (polaron binding) energy ε C ≈ ε B being inversely proportional to the polaron size, an ultimate axial conversion is implied from smaller polarons to larger polarons as the carrier concentration x goes to the overdoped range. This expectation converges with our earlier two-fluid boson-fermion model for the T c − p phase diagrams of La 2−x Sr x CuO 4 [20]. A similar trend of increasing the polaron size may be deduced from the in-plane data.…”

Section: Discussionsupporting

confidence: 91%

“…Parameter data from earlier literature are summarized in Table II [7,20,28,29]. For comparison, we present a summary of vibronic-polaron parameters reported in earlier papers, as derived from optical and transport data on La 1−x Sr x CuO 4 .…”

Section: Discussionmentioning

confidence: 99%

“…Figure 2), which implies that the Cu(P)-O(A) step is the bottleneck of the axial transport. p is an electric dipole associated with the Cu(P)-O(A) CT [20]. The temperature dependence of ρ c is basically carried by k 12 (T ) which is a dynamically-coupled, barrier-controlled CT rate described at length elsewhere [7,21,22].…”

Section: Axial Resistivitymentioning

confidence: 99%

“…2 pd )}, where the lower (upper) sign refers to the separation between the B-NB and NB-AB states, respectively [7,20]. Alternatively, the gap may take another form if the electronic correlations are essential: ε gap = U − ∆ CT , where U is the correlation energy and ∆ CT is the charge transfer gap.…”

Section: + 8tmentioning

confidence: 99%

“…The energy spectrum of that molecule is well-known: It consists of "bonding" (B), "non-bonding" (NB), and "antibonding" (AB) energy levels, as follows (cf. [20]): Fig.6(a).…”

Section: The O(a)-cu(p)-o(a) Triatomic Moleculementioning

confidence: 99%

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Polarons in axial transport in single-layer high-Tc superconductors

Andreev¹,

Tsintsarska

Dimitrova-Ivanovich

et al. 2004

Open Physics

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The temperature T dependencies ρ(T ) of normal state electric resistivities ρ c (axial) and ρ ab (in plane) of single-layer high-T c superconductors show common trends: As T is raised, the resistivity first drops steeply before it starts rising ∝ T above an apparent semiconductor-to-metal crossover T cross . To analyze ρ(T ) we plott T /ρ against T at various dopings x for both ρ c and ρ ab . T/ρ is inversely proportional to the traversal time across a potential barrier as an ionic particle drifts in an electric field. We find T/ρ in good agreement with the T dependence of the quantum rate of migrating particles: As T is raised, a zero-point rate at the lowest T is extended to a nearly flat plateau before a thermally activated branch sets in. We also find evidence for the admixture of 1-& 2-phonon absorptions below the Arrhenius range. These features shape the semiconductorlike branch below T cross . Above T cross a metallic-like branch sets in, its ∝ T character deriving from the field coupling of the migrating particle. Our analysis suggests that metal physics may not suffice if ionic features play a role in transport. We attribute our conclusions to the drift of strong-coupling polarons along Cu-O bonds. These "bond polarons" originate from carrier scattering by double-well potentials associated with the bonds. A bond polaron dissociates to a free hole as it passes onto a neighboring O-O link.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Axial Resistivitymentioning

confidence: 99%

Section: + 8tmentioning

confidence: 99%

“…The energy spectrum of that molecule is well-known: It consists of "bonding" (B), "non-bonding" (NB), and "antibonding" (AB) energy levels, as follows (cf. [20]): Fig.6(a).…”

Section: The O(a)-cu(p)-o(a) Triatomic Moleculementioning

confidence: 99%

See 3 more Smart Citations

Polarons in axial transport in single-layer high-Tc superconductors

Andreev¹,

Tsintsarska

Dimitrova-Ivanovich

et al. 2004

Open Physics

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Vibronic polarons: Self‐trapping, local rotation, and band features

Andreev

Ivanovich

Georgiev

2002

Int J of Quantum Chemistry

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ABSTRACT:We revisit basic theoretical concepts of local and itinerant vibronic polarons in crystals. The following results may be regarded as novel: (1) The electron self-trapping rate to a small polaron is calculated via the reaction rate method; subsequently, self-trapped on-center small polarons relax to an off-center vibronic polaron state. (2) The general vibronic Hamiltonian is redefined so as to incorporate both local and itinerant behavior and pairing into bipolarons or Cooper pairs. (3) The planar rotation and diametral tunneling of an off-center polaron around and across its centrosymmetrical site are dealt with to adiabatic approximation. (4) Variational calculations are made for vibronic polarons itinerant along 1-D chains by means of a two-band extension of Merrifield's ansatz. This investigation of vibronic polarons is undertaken in view of their presumed role in high-temperature superconductivity and colossal magnetoresistance.

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