Evolution of the Electronic State through the Reduction Annealing in Electron-Doped Pr1.3-xLa0.7CexCuO4+δ(x=0.10) Single Crystals: Antiferromagnetism, Kondo Effect, and Superconductivity

Adachi, Tadashi; Mori, Yasutane; Takahashi, Atsushi; Kato, Masaru; Nishizaki, Terukazu; Sasaki, T.; Kobayashi, Norio; Koike, Yasuhiro

doi:10.7566/jpsj.82.063713

Cited by 84 publications

(88 citation statements)

References 19 publications

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“…The difference in the d-p offset and hence the on-site U rises because the electron-doped cuprates, with the T'-type structure, have no apical oxygen, while La 2 CuO 4 having the T-type structure has apical oxygens at close distance to the copper atom. [16][17][18][19] However, a recent first principles estimation 20) has revealed that La 2 CuO 4 is actually an exception that has very large d-p level offset, while many of the hole-doped cuprates have d-p offset values and hence the on-site U comparable to those in the T'-type electron doped systems. A typical example with a moderate d-p offset and U is HgBa 2 CuO 4 , in which T c is very high (∼ 100K) and a pseudo gap is observed.…”

Section: Introductionmentioning

confidence: 99%

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates

2017

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Recent experiments revealed a striking asymmetry in the phase diagram of the high temperature cuprate superconductors. The correlation effect seems strong in the hole-doped systems and weak in the electrondoped systems. On the other hand, a recent theoretical study shows that the interaction strengths (the Hubbard U ) are comparable in these systems. Therefore, it is difficult to explain this asymmetry by their interaction strengths. Given this background, we analyze the one-particle spectrum of a single band model of a cuprate superconductor near the Fermi level using the dynamical mean field theory. We find the difference in the "visibility" of the strong correlation effect between the hole-and electron-doped systems. This can explain the electron-hole asymmetry of the correlation strength without introducing the difference in the interaction strength.

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Section: Introductionmentioning

confidence: 99%

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates

2017

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“…Recently, in thin films2122 and powdered samples2324 of e-HTSCs, superconductivity was found even without Ce doping. Inspired by those studies, Adachi et al 25. further improved the reduction annealing method of Brinkmann et al .…”

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Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

et al. 2016

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In the hole-doped cuprates, a small number of carriers suppresses antiferromagnetism and induces superconductivity. In the electron-doped cuprates, on the other hand, superconductivity appears only in a narrow window of high-doped Ce concentration after reduction annealing, and strong antiferromagnetic correlation persists in the superconducting phase. Recently, Pr1.3−xLa0.7CexCuO4 (PLCCO) bulk single crystals annealed by a protect annealing method showed a high critical temperature of around 27 K for small Ce content down to 0.05. Here, by angle-resolved photoemission spectroscopy measurements of PLCCO crystals, we observed a sharp quasi-particle peak on the entire Fermi surface without signature of an antiferromagnetic pseudogap unlike all the previous work, indicating a dramatic reduction of antiferromagnetic correlation length and/or of magnetic moments. The superconducting state was found to extend over a wide electron concentration range. The present results fundamentally challenge the long-standing picture on the electronic structure in the electron-doped regime.

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“…In our view, this difference can be related to the absence of an antiferromagnetic phase in PCO. 10,12,21,57 In electron-doped cuprates, the magnetic order induces the pseudogap. With doping, the Neel temperature decreases monotonically leading to a complete suppression of antiferromagnetic order at higher doping accompanied by the disappearance of the pseudogap.…”

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Optical study of superconductingPr2CuOxwithx≃4

et al. 2014

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Superconducting Pr2CuOx, x ≃ 4 (PCO) films with T ′ structure and a Tc of 27 K have been investigated by various optical methods in a wide frequency (7 -55000 cm −1 ) and temperature (2 to 300 K) range. The optical spectra do not reveal any indication of a normal-state gap formation. A Drude-like peak centered at zero frequency dominates the optical conductivity below 150 K. At higher temperatures, it shifts to finite frequencies. The detailed analysis of the low-frequency conductivity reveals that the Drude peak and a far-infrared (FIR) peak centered at about 300 cm −1 persist at all temperatures. The FIR-peak spectral weight is found to grow at the expense of the Drude spectral weight with increasing temperature. The temperature dependence of the penetration depth follows a behavior typical for d-wave superconductors. The absolute value of the penetration depth for zero temperature is 1.6 µm, indicating a rather low density of the superconducting condensate.

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Evolution of the Electronic State through the Reduction Annealing in Electron-Doped Pr_1.3-xLa_0.7Ce_xCuO_4+δ(x=0.10) Single Crystals: Antiferromagnetism, Kondo Effect, and Superconductivity

Cited by 84 publications

References 19 publications

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates

Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

Optical study of superconductingPr2CuOxwithx≃4

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Evolution of the Electronic State through the Reduction Annealing in Electron-Doped Pr1.3-xLa0.7CexCuO4+δ(x=0.10) Single Crystals: Antiferromagnetism, Kondo Effect, and Superconductivity

Cited by 84 publications

References 19 publications

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High Tc Cuprates

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High Tc Cuprates

Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

Optical study of superconductingPr2CuOxwithx≃4

Contact Info

Product

Resources

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Evolution of the Electronic State through the Reduction Annealing in Electron-Doped Pr_1.3-xLa_0.7Ce_xCuO_4+δ(x=0.10) Single Crystals: Antiferromagnetism, Kondo Effect, and Superconductivity

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates