Superconductivity at 103 K in CdBa2(Ca0.7Y0.3)Cu2O y

Balchev, N.; Lovchinov, V.; Gattef, E.; Staneva, A.; Konstantinov, Konstantin; Pirov, J.

doi:10.1007/bf00728166

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…Actually there are several reports on similarity in Cd compounds. 34,35) we might be able to say that if additional characters not appear, other dievalent metal atoms in oxides without spin moments, e.g. Hf and W may work.…”

Section: Discussionmentioning

confidence: 99%

Material-Dependent Screening of Coulomb Interaction in Single-Layer Cuprates

2018

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To explore material dependence of cuprate superconductors, we evaluate effective Coulomb interactions for Hg1201 and Tl1201, where Tl1201 having a nearly half value of T c of Hg1201 even at the optimal oxygen concentration. Although structures are similar for these superconductors, there is an apparent difference in the occupied levels below E F . The characteristic difference in the band structure is correlated with oxygen contents in the buffer layer. By using constrained Random Phase Approximation, effective screened Coulomb interactions are estimated for HgBa 2 CuO 4 and TlBa 2 CuO 5 . The results shows that the value of screened on-site Coulomb interaction in Hg1201 is nearly twice bigger than that in Tl1201. In addition, The eigenvalues of the linearized Eliashberg equation of single-band Hubbard model within FLEX can show apparent difference in T c . When we assume that the twice big screened on-site Coulomb for Hg, the material dependent T c might be explained.

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Section: Discussionmentioning

confidence: 99%

Material-Dependent Screening of Coulomb Interaction in Single-Layer Cuprates

2018

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“…28) Cd-based cuprates are synthesized and they show high-T c superconductivity. [29][30][31] Multi-layered cuprates including Al or Ga are reported. 32,33) The determination of materials parameters is also useful for considering additional effects of multi-layer systems.…”

Section: Summary and Discussionmentioning

confidence: 99%

Material Optimization of Potential High-$T_{\text{c}}$ Superconducting Single-layer Cuprates

Teranishi,

Nishiguchi,

Kusakabe

2020

Preprint

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We investigated the material parameters of several single-layer cuprates, including those with fluorinated buffer layers, with the aim of identifying possible high-temperature superconductors. To evaluate the material parameters, we use the Wannierization techniques and the constrained random phase approximation. The obtained single-band Hubbard models are studied using the fluctuation-exchange approximation. Comparison among several cuprates reveals unknown high-T c superconductors. In, Ga, Al, and Cd compounds in particular show the potential to exhibit higher-T c superconductivity than Hg1201.

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“…A new compound, LaBaCaCu,O, with a critical temperature of 25K has been synthe~ized.,~ Further detailed investigation of the system La-Ba-Ca-Cu-0 allowed the preparation of three series with tetragonal triple perovskite structures and nominal compositions of La,-,Ca,Ba,Cu,O, A cadmium analogue of the T1 and Hg series, CdBa2Can-lCun02n+2+a, was obtained in ref. 44. The 1212 phase was found to be non-superconducting, but the substitution of Ca for Y [CdBa,(Ca,~,Y,~,)Cu,O,,] leads to superconductivity with T, = 103 K. 44 The 1223 phase has a critical temperature of 103-107 K.4s…”

Section: New Htsc Compoundsmentioning

confidence: 99%

“…44. The 1212 phase was found to be non-superconducting, but the substitution of Ca for Y [CdBa,(Ca,~,Y,~,)Cu,O,,] leads to superconductivity with T, = 103 K. 44 The 1223 phase has a critical temperature of 103-107 K.4s…”

Section: New Htsc Compoundsmentioning

confidence: 99%