Inhomogeneous superconductivity in both underdoped and overdoped regimes of high-T<sub>c</sub>cuprates

Koike, Yasuhiro; Adachi, Tadashi; Tanabe, Yasuhiro; Omori, Keiichi; Noji, Takashi; Sato, Hidetaka

doi:10.1088/1742-6596/108/1/012003

Cited by 6 publications

(6 citation statements)

References 31 publications

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“…For example, even the best YBCO samples near optimal doping have γ r /γ n of rougly 10% [46], the origin of which remains unclear. Remarkably, an anticorrelated behavior between γ r and γ n similar to our results has been reported by Koike et al [47] in La 2−x Sr x CuO 4 , which was argued to result from microscopic phase separation into SC and non-SC metallic regions. This could also explain our results for Ba(Fe 1−x Co x ) 2 As 2 .…”

supporting

confidence: 92%

Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe _1−x Co _x ) ₂ As ₂ iron pnictides

Hardy

Philipp

Wolf

et al. 2010

EPL

135

136

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Abstract. -An extensive calorimetric study of the normal-and superconducting-state properties of Ba(Fe1−xCox)2As2 is presented for 0 < x < 0.2. The normal-state Sommerfeld coefficient increases (decreases) with Co doping for x < 0.06 (x > 0.06), which illustrates the strong competition between magnetism and superconductivity to monopolize the Fermi surface in the underdoped region and the filling of the hole bands for overdoped Ba(Fe1−xCox)2As2. All superconducting samples exhibit a residual electronic density of states of unknown origin in the zero-temperature limit, which is minimal at optimal doping but increases to the normal-state value in the strongly under-and over-doped regions. The remaining specific heat in the superconducting state is well described using a two-band model with isotropic s-wave superconducting gaps.Introduction. -Despite the fact that the theoretical background has been available since the late 50's with the pioneering papers of Suhl et al.[1] and Moskalenko [2], multiband superconductivity (MBSC) emerged as an unanimously accepted phenomenon only after the discovery of the MgB 2 superconductor in 2001 [3]. Rapidly, calorimetric signatures, like the excess specific heat observed at low temperature (with respect to the single-band BCS curve) [4], the initial rapid rise of the mixed-state heat capacity with magnetic field [5], and the anomalous positive curvature of the upper critical field [6] provided the most convincing evidence of its existence and are now textbook hallmarks of the existence of two gaps. Later, significant interband contributions to the Eliashberg function, reminiscent of MBSC, were experimentally detected using tunneling experiments [49]. Since then, the occurrence of MBSC has been discussed for many different compounds including heavy fermions [7], cobaltates [8], chalcogenides [9], A15 compounds [50], and the recently discovered iron-pnictide family. The aforementioned characteristic signatures of MBSC are less pronounced in iron pnictide superconductors since the interband coupling, pro-

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supporting

confidence: 92%

Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe _1−x Co _x ) ₂ As ₂ iron pnictides

Hardy

Philipp

Wolf

et al. 2010

EPL

135

136

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“…This idea was later transformed into stripe activity in cuprate and manganite physics, where alternating conducting and magnetic regions constituted separated "phases" [12,302,[475][476][477][478][479][480]. Recently, a lot of evidence for local lattice distortions, Jahn-Teller polaron occurrence, and other percolation and filamentary structure formation appeared [177,217,228,[481][482][483][484][485], supporting new sophisticated theoretical efforts in the science of phase separation [84,230,379,[486][487][488][489][490][491][492][493], mostly but not necessarily dealing with high-T c oxides. The electronic inhomogeneity in cuprates, as discussed above, belongs to the same category of phenomena.…”

mentioning

confidence: 96%

Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

Gabovich

Войтенко

Ekino

et al. 2010

Advances in Condensed Matter Physics

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Explicit and implicit experimental evidence for charge density wave (CDW) presence in high-Tcsuperconducting oxides is analyzed. The theory of CDW superconductors is presented. It is shown that the observed pseudogaps and dip-hump structures in tunnel and photoemission spectra are manifestations of the same CDW gapping of the quasiparticle density of states. Huge pseudogaps are transformed into modest dip-hump structures at low temperatures,T, when the electron spectrum superconducting gapping dominates. Heat capacity jumps at the superconducting critical temperature and the paramagnetic limit are calculated for CDW superconductors. For a certain range of parameters, the CDW state in ad-wave superconductor becomes reentrant withT, the main control quantity being a portion of dielectrcally gapped Fermi surface. It is shown that in the weak-coupling approximation, the ratio between the superconducting gap at zero temperatureΔ(T=0)andTchas the Bardeen-Cooper-Schrieffer value fors-wave Cooper pairing and exceeds the corresponding value ford-wave pairing of CDW superconductors. Thus, large experimentally found values2Δ(T=0)/Tc≈5÷8are easily reproduced with reasonable input parameter values of the model. The conclusion is made that CDWs play a significant role in cuprate superconductivity.

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“…The interpretation of inhomogeneous superconductivity, whether static or dynamic, has been proposed in different variants by several authors (see, e.g., Refs. [19,[54][55][56][57][58][59]) and is probably correct.…”

Section: Discussionmentioning

confidence: 99%

Taking a step back and looking at the “superconducting dome” from a distance

Schilling

2023

Physica C: Superconductivity and its Applications

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Inhomogeneous superconductivity in both underdoped and overdoped regimes of high-T_ccuprates

Cited by 6 publications

References 31 publications

Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe _1−x Co _x ) ₂ As ₂ iron pnictides

Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe _1−x Co _x ) ₂ As ₂ iron pnictides

Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

Taking a step back and looking at the “superconducting dome” from a distance

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Inhomogeneous superconductivity in both underdoped and overdoped regimes of high-Tccuprates

Cited by 6 publications

References 31 publications

Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe 1−x Co x ) 2 As 2 iron pnictides

Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe 1−x Co x ) 2 As 2 iron pnictides

Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

Taking a step back and looking at the “superconducting dome” from a distance

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Inhomogeneous superconductivity in both underdoped and overdoped regimes of high-T_ccuprates

Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe _1−x Co _x ) ₂ As ₂ iron pnictides

Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe _1−x Co _x ) ₂ As ₂ iron pnictides