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Pomar, A.; Martel, L.; Li, Z. Z.; Raffy, H.

doi:10.1103/physrevb.63.134525

Cited by 17 publications

(12 citation statements)

References 31 publications

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“…1-3 in Ref. [2]) that the pinning effect of the CD's is maximised when the www.pss-a.com =1T H x field is parallel to them, giving either a minimum in R(θ, H) or a maximum in J c (θ, H) for θ = 0. The former is more and more visible as T decreases towards the irreversibility temperature T irr while the latter is more and more apparent when T increases towards T irr .…”

Section: From Low To High Anisotropy In Bi 2 Sr 2-x La X Cuo Y Thin Fmentioning

confidence: 96%

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Anisotropy and vortex behaviour in BiSrCaCuO thin films and multilayers probed by columnar pinning centers

Raffy

Murrills

Pomar

et al. 2006

Physica Status Solidi (a)

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In this paper we review typical mixed state transport results obtained on a variety of Bi 2 Sr 2 Ca n-1 Cu n O y thin films and artificial multilayers, which allowed us to cover the range from low to high anisotropy. The vortex behaviour, 2D or 3D, probed by the pinning properties of columnar defects, is shown to be highly dependant on the anisotropy, and therefore on the microstructure of the system.

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Section: From Low To High Anisotropy In Bi 2 Sr 2-x La X Cuo Y Thin Fmentioning

confidence: 96%

“…Finally by producing artificial distortion of the microstructure of our Bi-2212 thin films we were able to render them much less anisotropic. In order to probe the vortex behaviour (either 2D or 3D) in each of these different systems, columnar defects, in general perpendicular to the CuO 2 layers, were introduced by heavy ion irradiation [2].…”

Section: Originalmentioning

confidence: 99%

Anisotropy and vortex behaviour in BiSrCaCuO thin films and multilayers probed by columnar pinning centers

Raffy

Murrills

Pomar

et al. 2006

Physica Status Solidi (a)

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“…The main difference between these two systems is their anisotropy factor gZ(m c /m ab ) 1/2 (1 (m c and m ab denote the effective mass of electrons moving along the c-axis and the ab plane, respectively). Numerous studies which were performed on these materials indicated that the electronic anisotropy strongly affects the static and dynamic properties of the vortex when having CDs [5,6]. However, the effects of anisotropy on the critical behaviour near the Bose glass melting line have not been reported so far.…”

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confidence: 96%

Universal scaling for both isotropic and anisotropic irradiated superconductors

Pignon

Ruyter

Ammor

2006

Journal of Physics and Chemistry of Solids

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“…Typically such films, with T c in the range 12 K-15 K for x = 0 and irradiated with a dose B Φ = 2 T, have their T c reduced by almost a factor 3. The extremum occurs when the field is parallel to the columns and is a signature of vortex line behaviour [3]. The change in hole doping, evaluated in [2], is almost linear with the dose, B Φ , and twice as large in Bi-2201 as in Bi-2212 films.…”

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Novel effects observed in heavy ion irradiated Bi2Sr2-xLaxCuOy thin films

et al. 2004

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The superconducting properties of Bi2Sr2−xLaxCuOy thin films irradiated by 1 GeV heavy ions have been investigated. Firstly, irradiation produces dramatic changes in Tc and in R(T ). This fact is attributed to a self-doping effect of the sample by oxygen liberated from the ion tracks. Secondly, the pinning properties of the columnar defects allowed us to probe different vortex behaviours for films with increasing La content (0 ≤ x ≤ 0.4). From the angular dependence of R(H) and Jc(H) in the mixed state, for a given column density, a directional pinning effect, or linear vortex behaviour, is observed for low x values, whereas no directional effect is seen for large x values and 2D scaling properties, characteristic of pancake vortices, are then observed. Importantly this reveals that changes in x induce large changes in the material anisotropy.Heavy ion irradiation of high T c compounds is a convenient way to create amorphous columns, 10-12 nm in diameter, of given density and direction, which are able to pin vortices. The majority of experiments have been made on BiSrCaCuO single crystals. By studying the transport properties of irradiated Bi 2 Sr 2−x La x CuO y thin films and using the La substitution to modify material properties, we were able to demonstrate the original effects of irradiation in this little studied system.Bi 2 Sr 2−x La x CuO y thin films (0 ≤ x ≤ 0.4) were epitaxially grown on heated single crystal SrTiO 3 substrates by reactive RF sputtering. Their composition and thickness were measured by RBS. Their microstructure, and in particular the evolution vs. x of the modulation amplitude were thoroughly studied by X-ray diffraction [1]. The films are single-phase and c-axis oriented with a disorientation of less than 0.2 deg. Irradiation was performed at GANIL with 1 GeV Pb ions. In this paper the direction of irradiation was along the c-axis with an equivalent field dose, B Φ =2 T or 3 T. Transport measurements were made on patterned films by a dc 4 probe technique. Measurements of R and J c in the mixed state were conducted for 1.2 K ≤ T ≤ T c and 0 ≤ H ≤ 8 T as a function of the field orientation θ with respect to the c-axis.The first striking consequence of heavy ion irradiation of these films is a strong change in T c . By irradiating optimally doped thin films, T c is dramatically decreased. Typically such films, with T c in the range 12 K-15 K for x = 0 and irradiated with a dose B Φ = 2 T, have their T c reduced by almost a factor 3. At the same time the sample resistance is increased and its behaviour changes from linear to non-linear with a positive curvature, characteristic of overdoped samples. The change in hole doping, evaluated in [2], is almost linear with the dose, B Φ , and twice as large in Bi-2201 as in Bi-2212 films. In contrast, by irradiating underdoped films, T c is increased and the resistance is decreased. Strikingly, irradiation is able to turn a semiconducting film into a superconducting one at low temperature (Fig. 1). This leads us to conclude that irradiation produce...

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Vortex pinning by columnar defects inBi2Sr2CuOy

Cited by 17 publications

References 31 publications

Anisotropy and vortex behaviour in BiSrCaCuO thin films and multilayers probed by columnar pinning centers

Anisotropy and vortex behaviour in BiSrCaCuO thin films and multilayers probed by columnar pinning centers

Universal scaling for both isotropic and anisotropic irradiated superconductors

Novel effects observed in heavy ion irradiated Bi2Sr2-xLaxCuOy thin films

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