Intrinsic inhomogeneity and the origin of the pseudogap

Kresin, Vladimir Z.; Ovchinnikov, Yu. N.; Wolf, Stuart A.

doi:10.1016/s0921-4534(00)00406-8

Cited by 8 publications

(5 citation statements)

References 23 publications

(27 reference statements)

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“…Recently it has been shown that for QCP models this relation will lead to (T DW (x)/T max DW ) 2 + (T c (x)/T max c ) 2 = 1 [114]. Many other possible reasons for pseudogap formation have been suggested, such as, for example, an intrinsic inhomogeneity [115], d-wave-type Fermi surface deformations (Pomeranchuk instability) [116], or interaction with diatomic negative U centers [117], but it is hardly possible even to mention all of them here.…”

Section: Theories Of Pseudogapmentioning

confidence: 99%

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article)

Kordyuk¹

2015

Low Temperature Physics

137

126

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A term first coined by Mott back in 1968 a "pseudogap" is the depletion of the electronic density of states at the Fermi level, and pseudogaps have been observed in many systems. However, since the discovery of the high-temperature superconductors (HTSC) in 1986, the central role attributed to the pseudogap in these systems has meant that by many researchers now associate the term pseudogap exclusively with the HTSC phenomenon. Recently, the problem has got a lot of new attention with the rediscovery of two distinct energy scales ("two-gap scenario") and charge density waves patterns in the cuprates. Despite many excellent reviews on the pseudogap phenomenon in HTSC, published from its very discovery up to now, the mechanism of the pseudogap and its relation to superconductivity are still open questions. The present review represents a contribution dealing with the pseudogap, focusing on results from angle resolved photoemission spectroscopy (ARPES) and ends up with the conclusion that the pseudogap in cuprates is a complex phenomenon which includes at least three different "intertwined" orders: spin and charge density waves and preformed pairs, which appears in different parts of the phase diagram. The density waves in cuprates are competing to superconductivity for the electronic states but, on the other hand, should drive the electronic structure to vicinity of Lifshitz transition, that could be a key similarity between the superconducting cuprates and iron-based superconductors. One may also note that since the pseudogap in cuprates has multiple origins there is no need to recoin the term suggested by Mott. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Theories Of Pseudogapmentioning

confidence: 99%

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article)

Kordyuk¹

2015

Low Temperature Physics

137

126

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“…The percolation of Sr 2 CuO 3 -type defects might explain the "granular metal" type conduction observed at higher temperatures in high resistivity samples. One might also be observing charge inhomogeneity as has been proposed for other cuprates [7]. However, this does not explain the metalinsulator transition that is observed in the Sr 1-x CuO 2-d films.…”

Section: Resultsmentioning

confidence: 87%

Evidence for pseudo‐gap behavior in defect‐doped infinite layer (Ca, Sr)CuO₂ thin films

Norton

Chakoumakos

Budai

et al. 2003

Physica Status Solidi (b)

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A distinct crossover between the high temperature and low temperature normal state dc transport properties of epitaxial (Ca, Sr)CuO 2 single crystal thin films has been observed. Defect-doped (Ca, Sr)CuO 2 films with dc conductivity behavior ranging from insulating to metallic-like were obtained by growing stoichiometric and cation-deficient material under various film growth conditions. The results indicate that 2D variable-range hopping is the dominant transport mechanism at low temperatures. The high temperature behavior depends on the magnitude of the conductivity, resulting in either activated conduction or a ln ρ ~ 1/T 1/2 dependence that is reminiscent of thermally-activated tunneling in a granular metal/insulator matrix. The distinct crossover in behavior suggests the possibility of gap formation in the temperature range 150 -200 K.

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“…As was mentioned above, an inhomogeneity can be caused also by an inhomogeneous distribution of carriers (see Ovchinnikov et al (2000)). However, since the inhomogeneous distribution of pair-breakers (dopants) appears to be the dominant source of inhomogeneity ,we focus below (see Sec.…”

Section: Qualitative Picturementioning

confidence: 88%

“…Indeed, the pair-breaking effect in borocarbides as a major source of inhomogeneity (see Sec. II) was analyzed by Ovchinnikov and Kresin (2000). An unconventional temperature dependence of the critical fields Hc and Hc 2 observed experimentally (Schmiedeshoff et al, (2001)) was explained by the presence of pair-breakers.…”

Section: Itmentioning

confidence: 95%

“…In this section we are going to present the theoretical analysis of the main features of the pseudogap state: density of states and the appearance of a gap structure, diamagnetism, a.c. properties, and the "giant" Josephson proximity effect. The analysis is based on our model (Ovchinnikov et al 1999(Ovchinnikov et al , 2001(Ovchinnikov et al , 2002, Kresin et al 2000Kresin et al , 2003Kresin et al , 2004; the qualitative picture was described above, Ch.…”

Section: Theorymentioning

confidence: 99%

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Inhomogeneous superconductivity and the “pseudogap” state of novel superconductors

Kresin¹,

Morawitz²,

Wolf³

2013

Superconducting State

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Novel superconducting compounds such as the high T c oxides are intrinsically inhomogeneous systems. An inhomogeneous structure is created by doping and the statistical nature of the distribution of dopants. Consequently, the critical temperature is spatially dependent: T c ≡ T c (r).Pair-breaking leads to a depression of T c and is a major factor leading to inhomogeneity . The "pseudogap" state is characterized by several energy scales : T*, T c *, and T c ≡ T c res. . The highest energy scale (T*) corresponds to the phase separation (at T T > T c : the compound contains superconducting "islands" embedded in the normal metallic matrix. As a result ,the system is characterized by normal conductance along with an energy gap structure, anomalous diamagnetism, unusual a.c. properties, isotope effect, and "giant" Josephson proximity effect. The energy gap may persist to temperature above T c * caused by the presence of a charge density wave (CDW) or spin density wave (SDW) in the region T>T c * by CDW, SDW, etc, whereas below T c * the pairing also makes a contribution to the energy gap (T c * is an "intrinsic" critical temperature). The values of T*, T c *, T c ≡ T c res. depend on the compound and the doping level. The transition at T c into the dissipationless (R=0) macroscopically coherent state is of a percolation nature.

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Intrinsic inhomogeneity and the origin of the pseudogap

Cited by 8 publications

References 23 publications

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article)

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article)

Evidence for pseudo‐gap behavior in defect‐doped infinite layer (Ca, Sr)CuO₂ thin films

Inhomogeneous superconductivity and the “pseudogap” state of novel superconductors

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Intrinsic inhomogeneity and the origin of the pseudogap

Cited by 8 publications

References 23 publications

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article)

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article)

Evidence for pseudo‐gap behavior in defect‐doped infinite layer (Ca, Sr)CuO2 thin films

Inhomogeneous superconductivity and the “pseudogap” state of novel superconductors

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Evidence for pseudo‐gap behavior in defect‐doped infinite layer (Ca, Sr)CuO₂ thin films