High Temperature Superconductivity

Uchida, S.

doi:10.1007/978-4-431-55300-7

Cited by 23 publications

(14 citation statements)

References 38 publications

(80 reference statements)

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“…Knowledge of the doping(x)-temperature (T ) phase diagram of superconductors with a high superconducting transition temperature, T c , and with strongly correlated electrons, such as the cuprates and Fe-based superconductors, is well recognized to be crucial to understand the mechanism of high-T c superconductivity [1]. Especially, the anomalous non-Fermi-liquid-like normal-state transport properties are central problems that need to be solved.…”

Section: Introductionmentioning

confidence: 99%

Incoherent-coherent crossover and the pseudogap in Te-annealed superconductingFe1+yTe1−xSexrevealed by magnetotransport measurements

et al. 2019

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In this study, we conducted various magnetotransport measurements on Fe 1+y Te 1−x Se x single crystals from which excess iron was sufficiently removed. Our results revealed that crossover from the incoherent to the coherent electronic state and opening of the pseudogap occur at high temperatures (≈ 150 K for x = 0.2). This is accompanied by a more substantial pseudogap and the emergence of a phase with a multi-band nature at lower temperatures (below ≈ 50 K for x = 0.2) before superconductivity sets in. A comparison of these results with those of the as-grown (non-superconducting) samples implies that the coherent state accompanied by the pseudogap is needed for the occurrence of superconductivity in this system. arXiv:1904.13020v1 [cond-mat.supr-con]

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Section: Introductionmentioning

confidence: 99%

Incoherent-coherent crossover and the pseudogap in Te-annealed superconductingFe1+yTe1−xSexrevealed by magnetotransport measurements

et al. 2019

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“…[12][13][14][15] In addition, there are some notable transition-metal-oxide superconductors, such as tungsten bronzes with T C values up to 6 K. 16,17 Within the 3d-transition-metal series, Ti + -based compounds are predicted to be promising candidates for high-T C superconductors as a result of their special filling (3d 1 and S = 1/2), 18 but superconducting titanates have been limited to materials like electrondoped SrTiO 3 (T C ≈0.41 K), 19 non-stoichiometric titanium monoxide TiO x (T C ≤ 2.3 K) 20,21 and ternary oxide Li-Ti-O (T C ≈14 K). [22][23][24] Recently, interest in superconducting titanate thin films has resurged, and superconductivity in TiO, 25 ) valence states, and there has been no report of superconductivity in a "pure" Ti 3+ (3d 1 ) system.…”

Section: Introductionmentioning

confidence: 99%

Observation of superconductivity in structure-selected Ti2O3 thin films

Weng

Zhang

et al. 2018

NPG Asia Mater

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The search for new superconductors capable of carrying loss-free current has been a research theme in condensed matter physics for the past decade. Among superconducting compounds, titanates have not been pursued as much as Cu 2+ (3d 9 ) (cuprate) and Fe 2+ (3d 6 ) (pnictide) compounds. Particularly, Ti 3+ -based compounds or electron systems with a special 3d 1 filling are thought to be promising candidates as high-T C superconductors, but there has been no report on such pure Ti 3+ -based superconducting titanates. With the advent of thin-film growth technology, stabilizing new structural phases in single-crystalline thin films is a promising strategy to realize physical properties that are absent in the bulk counterparts. Herein, we report the discovery of unexpected superconductivity in orthorhombicstructured thin films of Ti 2 O 3 , a 3d 1 electron system, which is in strong contrast to the conventional semiconducting corundum-structured Ti 2 O 3 . This is the first report of superconductivity in a titanate with a pure 3d 1 electron configuration. Superconductivity at 8 K was observed in the orthorhombic Ti 2 O 3 films. Leveraging the strong structureproperty correlation in transition-metal oxides, our discovery introduces a previously unrecognized route for inducing emergent superconductivity in a newly stabilized polymorph phase in epitaxial thin films.

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“…The crystal lattice of high-T C cuprate superconductors is composed of blocks of Cu-O planes separated by charge-reservoir layers 1 . In the case of compounds with two (or more) Cu-O planes within a single block, the socalled bilayer splitting of the Fermi surface appears due to the hybridization of electron states originating from the individual layers.…”

Section: Introductionmentioning

confidence: 99%

Effect of interlayer processes on the superconducting state within thet−J−Umodel: Full Gutzwiller wave-function solution and relation to experiment

Zegrodnik

Spałek

2017

Phys. Rev. B

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The Gutzwiller wave function solution of the t-J-U model is considered for the bilayer high-TC superconductor by using the so-called diagrammatic expansion method. The focus is on the influence of the interlayer effects on the superconducting state. The chosen pairing symmetry is a mixture of d x 2 −y 2 symmetry within the layers and the so-called s ± symmetry for the interlayer contribution. The analyzed interlayer terms reflect the interlayer electron hopping, the interlayer exchange coupling, and the interlayer pair hopping. The obtained results are compared with selected experimental data corresponding to the copper-based compound Bi-2212 with two Cu-O planes in the unit cell. For the sake of comparison, selected results for the case of the bilayer Hubbard model are also provided. This paper complements our recent results obtained for the single-plane high temperature cuprates (cf. Ref. 26).

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High Temperature Superconductivity

Cited by 23 publications

References 38 publications

Incoherent-coherent crossover and the pseudogap in Te-annealed superconductingFe1+yTe1−xSexrevealed by magnetotransport measurements

Incoherent-coherent crossover and the pseudogap in Te-annealed superconductingFe1+yTe1−xSexrevealed by magnetotransport measurements

Observation of superconductivity in structure-selected Ti2O3 thin films

Effect of interlayer processes on the superconducting state within thet−J−Umodel: Full Gutzwiller wave-function solution and relation to experiment

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