Magnetic properties of superconducting HgBa2CuO4+δ single crystals in the overdoped state before and after particle irradiation

Zehetmayer, Martin; Eisterer, M.; Sponar, Stephan; Weber, H.W.; Wiśniewski, A.; Puźniak, R.; Panta, P.; Казаков, С. М.; Karpiński, J.

doi:10.1016/j.physc.2004.11.010

Cited by 8 publications

(9 citation statements)

References 45 publications

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“…An increase in upper critical field and a reduction of its anisotropy were reported and are expected theoretically. A similar behaviour of B c2 was also found in the A15 compounds 17 and a reduction of anisotropy was reported for the cuprates (Hg-1201) 18 .…”

Section: Introductionsupporting

confidence: 83%

Neutron Irradiation of Sm-1111

Eisterer,

Weber,

Jiang

et al. 2009

Preprint

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SmFeAsO 1−x F x was irradiated in a fission reactor to a fast (E > 0.1 MeV) neutron fluence of 4 × 10 21 m −2 . The introduced defects increase the normal state resistivity due to a reduction in the mean free path of the charge carriers. This leads to an enhancement of the upper critical field at low temperatures. The critical current density within the grains, J c , increases upon irradiation.The second maximum in the field dependence of J c disappears and the critical current density becomes a monotonically decreasing function of the applied magnetic field.

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Section: Introductionsupporting

confidence: 83%

Neutron Irradiation of Sm-1111

Eisterer,

Weber,

Jiang

et al. 2009

Preprint

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“…In addition, it is known that the lock-in transition occurs only at fields below H c1 c (see refs. 7,11). The lock-in angle is of the order of H c1 c /H and the transition is difficult to observe even at low fields.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, in the present studies performed in the vicinity of T c , pinning by twin boundaries can be neglected. In addition, it is known that the lock-in transition occurs only at fields below H c c1 (see [7,11]). The lock-in angle is of the order of H c c1 /H and the transition is difficult to observe even at low fields [12].…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of the superconducting state parameters and intrinsic pinning in low-level Pr-doped Y Ba₂Cu₃O_7−δsingle crystals

Kortyka¹,

Puźniak²,

Wiśniewski³

et al. 2010

Supercond. Sci. Technol.

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The influence of low-level Pr substitution in Y 1-x Pr x Ba 2 Cu 3 O 7-δ single crystals on the anisotropy of the superconducting state parameters was investigated by torque magnetometry in magnetic fields of up to 9 T. An averaged anisotropy parameter, γ, of 7.4 was found and no influence of the Pr ion concentration on γ was observed up to a Pr content of 2.4%. A pronounced maximum at angles between 0.5 and 1º out of the ab-plane was observed in all crystals in the irreversible angular dependence of the torque. This maximum is attributed to intrinsic pinning associated with kinked vortices. The variation of the irreversible torque with the substitution level indicates the influence of the Pr content on pinning within the CuO 2 planes, even though the anisotropy of the superconducting state parameters is not affected.

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“…Therefore, θ lock should decrease with increasing field. This evolution was observed in high-anisotropy cuprates, 10 . It is thus possible that this simple H c1 picture holds only for high-anisotropy compounds and that the lock-in angle is not necessarily inversely proportional to the field.…”

Section: Discussionmentioning

confidence: 53%

“…In high anisotropy materials lock-in studies, [4][5][6][7] the 2D character is so strong that the lock-in is present almost up to T c . However, the vicinity of the superconducting transition makes it difficult to observe the lock-in onset.…”

Section: Introductionmentioning

confidence: 99%

Vortex lock-in transition coinciding with the 3D to 2D crossover in YBa2Cu3O7

et al. 2012

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A vortex lock-in transition was directly detected by torque magnetometry in an overdoped YBa 2 Cu 3 O 7 single crystal of low anisotropy (≈ 7). The locked-in state was observed below the two-to three-dimensional crossover temperature T cr = 76 K, independently of extrinsic pinning effects, thanks to a high-quality clean crystal and the use of a vortex shaking technique. The lock-in effect is enhanced by decreasing temperature and increasing magnetic field. The shape of the torque signal as a function of the angle between the applied magnetic field and the crystallographic c axis is in very good agreement with the model developed by Feinberg and Ettouhami [Int. J. Mod. Phys. B 7, 2085 (1993)] for quasi-2D superconductors, despite the low anisotropy of the material.

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Magnetic properties of superconducting HgBa2CuO4+δ single crystals in the overdoped state before and after particle irradiation

Cited by 8 publications

References 45 publications

Neutron Irradiation of Sm-1111

Neutron Irradiation of Sm-1111

Anisotropy of the superconducting state parameters and intrinsic pinning in low-level Pr-doped Y Ba₂Cu₃O_7−δsingle crystals

Vortex lock-in transition coinciding with the 3D to 2D crossover in YBa2Cu3O7

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Magnetic properties of superconducting HgBa2CuO4+δ single crystals in the overdoped state before and after particle irradiation

Cited by 8 publications

References 45 publications

Neutron Irradiation of Sm-1111

Neutron Irradiation of Sm-1111

Anisotropy of the superconducting state parameters and intrinsic pinning in low-level Pr-doped Y Ba2Cu3O7−δsingle crystals

Vortex lock-in transition coinciding with the 3D to 2D crossover in YBa2Cu3O7

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Anisotropy of the superconducting state parameters and intrinsic pinning in low-level Pr-doped Y Ba₂Cu₃O_7−δsingle crystals