A new approach to the design of high-Tc superconductors: Metallised interlayers

Tallon, J. L.; Bernhard, C.; Niedermayer, Ch.; Shimoyama, Jun–ichi; Hahakura, S.; Yamaura, Kazunari; Hiroi, Zenji; Takano, Mikio; Kishio, K.

doi:10.1007/bf00753892

Cited by 29 publications

(19 citation statements)

References 10 publications

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“…28,29 This has been ascribed to the improved metallicity of the ͓BiO͔ ϱ layers ͑ c decrease͒ as the oxygen content increases. 30 We indeed observed a c decrease from c ϭ6Ϯ2 ⍀ cm to c ϳ0.9 ⍀ cm after heavily doping a xϭ0 crystal, in agreement with results of Refs. 28 and 29.…”

Section: A Doping State In the Bi 2 Sr 2 Ca 1؊x Y X Cu 2 O 8؉␦ Crystalssupporting

confidence: 92%

Doping dependence of the in-plane penetration depth and fishtail inBi2Sr2Ca
Villard
¹
,
Pelloquin
²
,
Maignan
³

1998
Phys. Rev. B
32
4
16
0
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We report on the London penetration depth ab (0), measurements, and second peak H determination in Bi 2 Sr 2 Ca 1Ϫx Y x Cu 2 O 8ϩ␦ ͑Bi-2212͒ crystals with different doping levels. By combining cationic substitutions and oxygen pressure annealings, crystals with a doping state going from the underdoped to overdoped regime have been obtained. The corresponding ab (0) values, deduced from reversible magnetization measurements have allowed us to evidence a ''boomerang'' shape for the T c ͓1/ ab 2 (0)͔ curve in the 0.8рT c /T c max р1 region. Moreover, other T c ͓1/ ab 2 (0)͔ values for superconducting crystals of Hg-and Tl-based cuprates are found to fit well with this boomerang path, demonstrating its universal nature. The overdoped side of the boomerang for the Bi-2212 crystals clearly shows that 1/ ab 2 (0) decreases as the doping level is increased. Since by the same time the characteristic field of the fishtail H monotonously increases, we have thus established that H increases with 1/ ab 2 (0) decreasing. Consequently, the linear relation H ϭ⌽ 0 / ab 2 (0) predicted by the electromagnetic model cannot account alone for the present experimental results in the overdoped regime.

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Section: A Doping State In the Bi 2 Sr 2 Ca 1؊x Y X Cu 2 O 8؉␦ Crystalssupporting

confidence: 92%

Doping dependence of the in-plane penetration depth and fishtail inBi2Sr2Ca
Villard
¹
,
Pelloquin
²
,
Maignan
³

1998
Phys. Rev. B
32
4
16
0
View full text Add to dashboard Cite

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“…Proximity-induced superconductivity in the interlayer results in a strongly enhanced superfluid density with a consequent halving of the effective interlayer spacing. The exponential dependence on d b may result in a 20-to 50-fold enhancement in H irr [4]. Examples include full oxygenation of the CuO 1-δ chains in Y-123 and Y-247 and the substitution of 25% Re for Hg in Hg-1212 or Hg-1223.…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the optimal design of high-Tc superconductors — the pseudogap and critical doping

Tallon¹,

Williams²,

Loram

2000

Physica C: Superconductivity

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The impact of the normal-state pseudogap, present in all optimal and underdoped HTS cuprates, on critical currents and critical temperature is surveyed. With the opening of the pseudogap around a doping state of p≈0.19 the condensation energy and superfluid density are rapidly suppressed due to reduction in the normal-state spectral weight. Even by optimal doping (p≈0.16) these measures of the 'strength' of superconductivity are diminished by up to 40%. This results in a sharp reduction in critical currents and irreversibility field, respectively. The optimal doping state where these properties are maximised is therefore not at maximum T c but in the lightly overdoped region where the pseudogap energy falls to zero at p≈0.19. The presence of impurities and grain boundaries further heightens these effects.

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“…The anisotropy change due to pressure-induced changes in the crystal structure can be estimated using the results of Tallon et al [31], in which he showed that the irreversibility field (or melting line) follows a very simple exponential dependence H m H m0 expÿd b =, where d b is the blocking layer distance and is a coherence length. The increase of the melting field due to this effect should be largest for c-axis pressure and can be calculated using da dp c dH m dp c dH m dc p dc dp c T (6) and the c-axis compliance 1=c dc=dp 4:7 10 ÿ3 =GPa [35].…”

mentioning

confidence: 99%

Crystal-Lattice Coupling to the Vortex-Melting Transition inYBa2Cu3O
Lortz
¹
,
Meingast
²
,
Welp
³

et al. 2003
Phys. Rev. Lett.
11
2
10
0
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Distinct discontinuities in the thermal expansion of the crystal lattice are observed at the melting transition of the vortex lattice in a naturally untwinned reversible YBa(2)Cu3O(7-delta) single crystal using high-resolution dilatometry. This coupling between the vortex transition and the crystal lattice demonstrates that the crystal lattice is more than a mere host for the vortices, and it is attributed to a strong pressure dependence of the superconducting transition temperature and thus to the condensation energy at the vortex-melting temperature.

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A new approach to the design of high-Tc superconductors: Metallised interlayers

Cited by 29 publications

References 10 publications

Doping dependence of the in-plane penetration depth and fishtail inBi2Sr2Ca
Villard
¹
,
Pelloquin
²
,
Maignan
³

1998
Phys. Rev. B
32
4
16
0
View full text Add to dashboard Cite

Doping dependence of the in-plane penetration depth and fishtail inBi2Sr2Ca
Villard
¹
,
Pelloquin
²
,
Maignan
³

1998
Phys. Rev. B
32
4
16
0
View full text Add to dashboard Cite

Factors affecting the optimal design of high-Tc superconductors — the pseudogap and critical doping

Crystal-Lattice Coupling to the Vortex-Melting Transition inYBa2Cu3O
Lortz
¹
,
Meingast
²
,
Welp
³

et al. 2003
Phys. Rev. Lett.
11
2
10
0
View full text Add to dashboard Cite

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A new approach to the design of high-Tc superconductors: Metallised interlayers

Cited by 29 publications

References 10 publications

Doping dependence of the in-plane penetration depth and fishtail inBi2Sr2CaVillard1, Pelloquin2, Maignan3 1998Phys. Rev. B324160View full textAdd to dashboardCite

Doping dependence of the in-plane penetration depth and fishtail inBi2Sr2CaVillard1, Pelloquin2, Maignan3 1998Phys. Rev. B324160View full textAdd to dashboardCite

Factors affecting the optimal design of high-Tc superconductors — the pseudogap and critical doping

Crystal-Lattice Coupling to the Vortex-Melting Transition inYBa2Cu3OLortz1, Meingast2, Welp3 et al. 2003Phys. Rev. Lett.112100View full textAdd to dashboardCite

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Doping dependence of the in-plane penetration depth and fishtail inBi2Sr2Ca
Villard
¹
,
Pelloquin
²
,
Maignan
³

1998
Phys. Rev. B
32
4
16
0
View full text Add to dashboard Cite

Doping dependence of the in-plane penetration depth and fishtail inBi2Sr2Ca
Villard
¹
,
Pelloquin
²
,
Maignan
³

1998
Phys. Rev. B
32
4
16
0
View full text Add to dashboard Cite

Crystal-Lattice Coupling to the Vortex-Melting Transition inYBa2Cu3O
Lortz
¹
,
Meingast
²
,
Welp
³

et al. 2003
Phys. Rev. Lett.
11
2
10
0
View full text Add to dashboard Cite