Pressure studies on the pseudogap and critical temperatures of a high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductor

Mello, E. V. L. de; Orlando, M. T. D.; González, Jeanette; Caixeiro, E.S.; Baggio-Saitovich, E.

doi:10.1103/physrevb.66.092504

Cited by 62 publications

(56 citation statements)

References 22 publications

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“…But the proper mechanism of LP pairing still remains unknown. At T pair << T * SBBs transform into fluctuating Cooper pairs (FCPs) [22,23,32,58], thus demonstrating the BEC-BCS transition [9,54] predicted by the theory [50][51][52][53]. This is a specific property of the HTSCs, which is the consequence of the extremely short coherence length in cuprates [2,3,9,10,50].…”

Section: Results and Discussion A Fluctuation Conductivitymentioning

confidence: 99%

“…In accordance with the model, the PG is believed to appear due to the LPs formation at T ≤ T * , accordingly regarded as a pseudogap temperature. At high temperatures T T * the LPs are believed to appear in the form of the so-called strongly bound bosons (SBBs) which obey the theory of Bose-Einstein condensation (BEC) [3,[50][51][52][53]. Note that either of the coupling mechanisms proposed by different aforementioned models can be responsible for the pairing at such high temperatures.…”

Section: Results and Discussion A Fluctuation Conductivitymentioning

confidence: 99%

“…As usual, T * is taken at the point where the experimental resistivity curve starts to dowwnturn from the high-temperature linear behavior [9,[57][58][59][60]. The more precise approach to determine T * with accuracy ±0.5 K is to explore the criterion ρ N (T ) = aT + ρ 0 [52], where a is the slope of the extrapolated ρ N (T ) and ρ 0 is its intercept with the y axis. Apparently, above T * , where ρ = ρ N , [ρ(T ) − ρ 0 ]/aT = 1 and its deviation from unity just determines T * .…”

Section: Results and Discussion A Fluctuation Conductivitymentioning

confidence: 99%

“…In this case, the significant reduction of T c is followed by nonmetallic resistivity temperature dependence [47]. Obviously, to be analyzed in terms of the LP model [9,[50][51][52][53][54] only samples with metallic ρ(T ), like the aforesaid SLs and SDs, have been studied.…”

Section: Methodsmentioning

confidence: 99%

“…The coherence length ξ c (0) also was found to decrease, suggesting the likely decrease of the ab-plane coherence length ξ ab which determines the size of the LPs. It has to result in the noticeable increase of the bonding energy ε b ∝ 1/ξ 2 ab [50][51][52][53], and finally in the observed increase of T * (Figs. 3, 10).…”

Section: B Pseudogap Analysismentioning

confidence: 99%

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Specific temperature dependence of pseudogap in YBa2Cu3O7−δ nanolayers

et al. 2016

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The pseudogap (PG) derived from the analysis of the excess conductivity σ ′ (T ) in superlattices and double-layer films of YBa2Cu3O 7−δ − PrBa2Cu3O 7−δ (YBCO-PrBCO), prepared by pulsed laser deposition, is studied for the first time. The σ ′ (T ) analysis has been performed within the local-pair (LP) model based on the assumption of the paired fermion (LPs) formation in the cuprate highTc superconductors (cuprates) below the representative temperature T * ≫ Tc resulting in the PG opening. Within the model, the temperature dependencies of the PG, ∆ * (T ), for the samples with different number of the PrBCO layers (NP r ) were analyzed in the whole temperature range from T * down to Tc. Near Tc, σ ′ (T ) was found to be perfectly described by the Aslamasov-Larkin (AL) and Hikami-Larkin (HL) [Maki-Thompson (MT) term] fluctuation theories, suggesting the presence of superconducting fluctuations in a relatively large (up to 15 K) temperature range above Tc. All sample parameters were found to change with increase of NP r , finally resulting in the appearance of the pronounced maximum of ∆ * (T ) at high temperatures. The result is most likely due to increasing influence of the intrinsic magnetism of PrBCO (µP r ≈ 4 µB) and suggests the possibility to search in that way the change of interplay between the superconductivity and magnetism in cuprates.

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Section: Results and Discussion A Fluctuation Conductivitymentioning

confidence: 99%

Section: Results and Discussion A Fluctuation Conductivitymentioning

confidence: 99%

Section: Results and Discussion A Fluctuation Conductivitymentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: B Pseudogap Analysismentioning

confidence: 99%

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Specific temperature dependence of pseudogap in YBa2Cu3O7−δ nanolayers

et al. 2016

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New Trends in the Use of Transition Metal–Ligand Complexes for Applications in Electroluminescent Devices

Langeveld²,

2005

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The advantage of using phosphorescent transition metal–ligand complexes in optoelectronic applications such as organic light‐emitting diodes (OLEDs) and light‐emitting electrochemical cells (LECs) are described and evaluated. Additionally, different device constructions utilizing phosphorescent transition‐metal complexes like iridium(III) mixed‐ligand complexes and ruthenium(II) systems are reviewed and specified. Diverse host materials in which the phosphorescent emitters can be placed are discussed, such as small organic molecules and a few polymeric systems, and alternative processing technologies are briefly compared. Recent developments in the synthesis of iridium(III) triplet emitters are discussed. Different device architectures require different kinds of metal–ligand complexes. The different synthetic routes leading to charged and non‐charged complexes are briefly discussed.

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Recent Developments in the Application of Phosphorescent Iridium(III) Complex Systems

et al. 2009

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The recent developments in using iridium(III) complexes as phosphorescent emitters in electroluminescent devices, such as (white) organic light‐emitting diodes and light‐emitting electrochemical cells, are discussed. Additionally, applications in the emerging fields of molecular sensors, biolabeling, and photocatalysis are briefly evaluated. The basic strategies towards charged and non‐charged iridium(III) complexes are summarized, and a wide range of assemblies is discussed. Small‐molecule‐ and polymer‐based materials are under intense investigation as emissive systems in electroluminescent devices, and special emphasis is placed on the latter with respect to synthesis, characterization, electro‐optical properties, processing technologies, and performance.

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Pressure studies on the pseudogap and critical temperatures of a high-Tcsuperconductor

Cited by 62 publications

References 22 publications

Specific temperature dependence of pseudogap in YBa2Cu3O7−δ nanolayers

Specific temperature dependence of pseudogap in YBa2Cu3O7−δ nanolayers

New Trends in the Use of Transition Metal–Ligand Complexes for Applications in Electroluminescent Devices

Recent Developments in the Application of Phosphorescent Iridium(III) Complex Systems

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