Correlation between electronegativity and high temperature superconductivity

Jayaprakash, R.; Shanker, J.

doi:10.1016/0022-3697(93)90270-2

Cited by 6 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result is basically confirmed in Ref. [21]. Tendencies for T C to be increasing with (χ a -χ c ) and [χ c /(χ c + χ a )] above threshold levels of 1.90 and 0.176, respectively, were also indicated [22,51].…”

Section: Electronegativity and The Charge-regulating Type I Cationssupporting

confidence: 78%

“…In earlier work [19][20][21][22], the average electronegativities of the cations (χ c ) and/or anions (χ a ) of various high-T C compounds, calculated using several different methods (arithmetic or geometric averaging, ionization potentials, etc. ), were considered and compared to corresponding transition temperatures.…”

Section: Electronegativity and The Charge-regulating Type I Cationsmentioning

confidence: 99%

“…In contrast with earlier investigations of possible correlations between T C and electronegativities [19][20][21][22], the approach presented herein places the focus on individual atoms. Specific to the cations in the type I inner layers, the additional influence of an element's electronegativity χ on fractional charge σ is considered.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Superconducting interaction charge in thallium-based high-TC cuprates: Roles of cation oxidation state and electronegativity

Harshman

Fiory

2015

Journal of Physics and Chemistry of Solids

View full text Add to dashboard Cite

Superconductivity in the Tl-based cuprates encompasses a notably broad range of measured optimal transition temperatures T C0 , ranging from lowest in the charge-depleted Tl-1201 compounds (Tl 1-x (Ba/Sr) 1+y La 1-y CuO 5-δ ), such as Tl 0.7 LaSrCuO 5 (37 K) and TlBa 1.2 La 0.8 CuO 5 (45.4 K), to highest in the Tl-1223 compound TlBa 2 Ca 2 Cu 3 O 9±δ (133.5 K). Seven Tl-based cuprates are considered and compared using the model of superconductive pairing via electronic interactions between two physically separated charge reservoirs, whereis determined by the superconducting interaction charge fraction σ, the number η of CuO 2 layers, and the basal-plane area A, each per formula unit, and the transverse distance ζ between interacting layers. Herein it is demonstrated that σ follows from the elemental electronegativity and the oxidation state of Tl, and other structurally analogous cations. The comparatively lower elemental electronegativity of Tl, in conjunction with its oxidation state, explains the higher σ and T C0 values in the Tl-based compounds relative to their Bi-based cuprate homologues. A derivation of σ is introduced for the optimal Tl 2 Ba 2 Ca η-1 Cu η O 2η+4 (for η = 1, 2, 3) compounds, which exhibit a Tl oxidation state at or near +3, obtaining the fundamental value σ 0 = 0.228 previously established for YBa 2 Cu 3 O 6.92 . Also reported is the marked enhancement in σ associated with Tl +1 and analogous inner-layer cations relative to higher-valence cations. For a model proposition of σ = σ 0 , the fractional Tl +1 content of the mixed-valence compound, TlBa 2 Ca 2 Cu 3 O 9±δ , is predicted to be 1/3 at optimization, in agreement with existing data. Charge depletion is illustrated for the two Tl-1201 compounds, where σ < σ 0 values are determined according to substitution of Ba , and/or Tl depletion. Additionally, statistical analysis of calculated and experimental transition temperatures of 48 optimal superconductors shows an absence of bias in determining σ, A, and ζ.

show abstract

Section: Electronegativity and The Charge-regulating Type I Cationssupporting

confidence: 78%

Section: Electronegativity and The Charge-regulating Type I Cationsmentioning

confidence: 99%

See 1 more Smart Citation

Superconducting interaction charge in thallium-based high-TC cuprates: Roles of cation oxidation state and electronegativity

Harshman

Fiory

2015

Journal of Physics and Chemistry of Solids

View full text Add to dashboard Cite

show abstract

“…This also supports the validity of calculated values of B. On the basis of Table2 we can also say that the Murnaghan equation works well for high-temperature superconductors [22].…”

Section: Resultssupporting

confidence: 85%