Upper critical field for optimally-doped YBa2Cu3O7−

Sekitani, Tsuyoshi; Miura, Nobuyuki; Ikeda, Satoru; Matsuda, Y.; Shiratsuchi, Yu

doi:10.1016/j.physb.2004.01.098

Cited by 69 publications

(90 citation statements)

References 21 publications

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“…Therefore, a finite residual anisotropy γ H (T → 0) ∼ 2 indicates that only H c2 is paramagnetically limited, while H ⊥ c2 is still governed by orbital effects. Finally we note that γ H < γ m was reported for several unconventional superconductors [13,14,35,36]. In particular, a nearly isotropic H c2 was reported for the (Ba,K)Fe 2 As 2 pnictide [71] despite a quasi-2D electronic structure.…”

Section: The Paramagnetic Limitmentioning

confidence: 58%

“…The high T c in combination with a strong coupling leads to a large superconducting energy gap ∆ ∼ 20 − 50 meV [6][7][8][9][10][11] and H c2 (0) ∼ 10 2 T [12][13][14][15][16][17][18][19]. Such strong fields may alter the ground state of the material.…”

Section: Introductionmentioning

confidence: 99%

“…Development of high magnetic field techniques in recent years has lead to a significant progress in studies of H c2 in high-T c superconductors [13,14,18,19]. But the problem of disentanglement of superconducting and PG magnetic responses remains.…”

Section: Introductionmentioning

confidence: 99%

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Low anisotropy of the upper critical field in a strongly anisotropic layered cuprateBi2.15Sr1.9CuO6+δ:Evidence for a paramagnetically limited superconductivity

et al. 2014

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We study angular-dependent magnetoresistance in a low Tc layered cuprate Bi2.15Sr1.9CuO 6+δ . The low Tc ∼ 4 K allows complete suppression of superconductivity by modest magnetic fields and facilitate accurate analysis of the upper critical field Hc2. We observe an universal exponential decay of fluctuation conductivity in a broad range of temperatures above Tc and propose a new method for extraction of Hc2(T ) from the scaling analysis of the fluctuation conductivity at T > Tc. Our main result is observation of a surprisingly low Hc2 anisotropy ∼ 2, which is much smaller than the effective mass anisotropy of the material ∼ 300. We show that the anisotropy is decreasing with increasing field and saturates at a small value when the field reaches the paramagnetic limit. We argue that the dramatic discrepancy of high field and low field anisotropies is a clear evidence for paramagnetically limited superconductivity.

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Section: The Paramagnetic Limitmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

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Low anisotropy of the upper critical field in a strongly anisotropic layered cuprateBi2.15Sr1.9CuO6+δ:Evidence for a paramagnetically limited superconductivity

et al. 2014

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“…2), and it requires near-perfect texture to achieve a high J c . The J c anisotropy is a result of an anisotropy in H c2 , in combination with a reduced pinning efficiency for magnetic fields that are perpendicular to the tape face, or H c. The upper critical magnetic field for fields perpendicular to the tape face µ 0 H c2 (0) c ≈ 120 T, whereas µ 0 H c2 (0) ⊥ c ≈ 250 T [124][125][126][127].…”

Section: Ybcomentioning

confidence: 99%

Superconducting Materials and Conductors: Fabrication and Limiting Parameters

Bottura

Godeke

2012

Rev. Accl. Sci. Tech.

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Superconductivity is the technology that enabled the construction of the most recent generation of high-energy particle accelerators, the largest scientific instruments ever built. In this review we trace the evolution of superconducting materials for particle accelerator magnets, from the first steps in the late 1960s, through the rise and glory of Nb-Ti in the 1970s, till the 2010s, and the promises of Nb 3 Sn for the 2020s. We conclude with a perspective on the opportunities for high-temperature superconductors (HTSs). Many such reviews have been written in the past, as witnessed by the long list of references provided. In this review we put particular emphasis on the practical aspects of wire and tape manufacturing, cabling, engineering performance, and potential for use in accelerator magnets, while leaving in the background matters such as the physics of superconductivity and fundamental material issues.

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“…Even with this discrepancy, we have demonstrated that with a correct dispersion model (Lorentz in this case), it is possible to determine the complex optical constants for this magnetic thin film. [27,28] and IR radiation sensors (bolometer). The superconducting properties of YBa 2 Cu 3 O 7Àδ thin films are highly sensitive to the oxygen content.…”

Section: Laser Ablation -From Fundamentals To Applications 132mentioning

confidence: 99%

Optical Properties of Complex Oxide Thin Films Obtained by Pulsed Laser Deposition

Ion¹,

Andrei²,

Dinescu³

et al. 2017

Laser Ablation - From Fundamentals to Applications

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The market for thin films of complex oxides obtained by different deposition techniques is increasing exponentially in last decades due to large variety of possible application such as high-efficient solar cell, optoelectronic devices, etc. pulsed laser deposition (PLD) is a versatile growth technique and recently became more attractive for industrial applications due to the possibility to obtain crystalline thin films on a large area. Laser processing techniques were successfully used to obtain thin films with good optical properties starting from simple oxides, such as Sm 2 O 3 , ZrO 2 , etc., to more complex lead-free materials: Sr x Ba 1Àx Nb 2 O 6 (SBN) and Na 1/2 Bi 1/2 TiO 3À x%BaTiO 3 , or superconductive oxide YBa 2 Cu 3 O 7Àδ . When oxide thin films are designated for electronic and optoelectronic devices or for solar cells, the optical properties and the thickness must be well known. For this purpose, the spectroscopic ellipsometry technique was developed. Ellipsometry is a powerful technique to determine the optical properties of thin films especially when the thicknesses of thin films are in a nanometer range.

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Upper critical field for optimally-doped YBa2Cu3O7−

Cited by 69 publications

References 21 publications

Low anisotropy of the upper critical field in a strongly anisotropic layered cuprateBi2.15Sr1.9CuO6+δ:Evidence for a paramagnetically limited superconductivity

Low anisotropy of the upper critical field in a strongly anisotropic layered cuprateBi2.15Sr1.9CuO6+δ:Evidence for a paramagnetically limited superconductivity

Superconducting Materials and Conductors: Fabrication and Limiting Parameters

Optical Properties of Complex Oxide Thin Films Obtained by Pulsed Laser Deposition

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