GeV-heavy ion irradiation effects in thallium-based superconducting copper oxides

Hardy, V.; Groult, D.; Provost, J.; Hervieu, M.; Raveau, B.; Bouffard, S.

doi:10.1016/0921-4534(91)90072-7

Cited by 56 publications

(10 citation statements)

References 17 publications

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“…STRONG PINNING Whereas in the previous sections we have concentrated on weak pointlike pins (uncorrelated disorder), here we focus our interest on the pinning properties of extended defects (correlated disorder). Typical examples of such extended pinning centers are one-dimensional screw dislocations, like those observed in thin films of YBCO (Hawley et al , 1991;Schlom et al , 1992;Mannhart et al , 1992), and the artificially produced columnar defect structure resulting from energetic heavy-ion irradiation (Roas, Hensel et al , 1990;Hardy et a/. , 1991;Konczykowski, Rullier-Albenque et al , 1991;Gerhauser et al , 1992).…”

Section: Intrinsic Pinning and Creepmentioning

confidence: 95%

Vortices in high-temperature superconductors

et al. 1994

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With the high-temperature superconductors a qualitatively new regime in the phenomenology of type-II superconductivity can be accessed. The key elements governing the statistical mechanics and the dynamics of the vortex system are (dynamic) thermal and quantum fluctuations and (static) quenched disorder. The importance of these three sources of disorder can be quantified by the Ginzburg number Gi =(T, /H, sg ) /2, the quantum resistance Qu =(e /A'i(p"/ski, and the critical current-density ratio j,/jo, with j, and jo denoting the depinning and depairing current densities, respectively (p" is the normal-state resistivity and E = m /M (1 denotes the anisotropy parameter). The material parameters of the oxides conspire to produce a large Ginzburg number Gi -10 and a large quantum resistance Qu -10 ', values which are by orders of magnitude larger than in conventional superconductors, leading to interesting effects such as the melting of the vortex lattice, the creation of new vortex-liquid phases, and the appearance of macroscopic quantum phenomena. Introducing quenched disorder into the system turns the Abrikosov lattice into a vortex glass, whereas the vortex liquid remains a liquid. The terms "glass" and "liquid" are defined in a dynamic sense, with a sublinear response p=BE/Bji c characterizing the truly superconducting vortex glass and a finite resistivity p( j~0))0 being the signature of the liquid phase. The smallness of j,/jo allows one to discuss the influence of quenched disorder in terms of the weak collective pinning theory. Supplementing the traditional theory of weak collective pinning to take into account thermal and quantum fluctuations, as well as the new scaling concepts for elastic media subject to a random potential, this modern version of the weak collective pinning theory consistently accounts for a large number of novel phenomena, such as the broad resistive transition, thermally assisted flux flow, giant and quantum creep, and the glassiness of the solid state. The strong layering of the oxides introduces additional new features into the thermodynamic phase diagram, such as a layer decoupling transition, and modifies the mechanism of pinning and creep in various ways. The presence of strong (correlated) disorder in the form of twin boundaries or columnar defects not only is technologically relevant but also provides the framework for the physical realization of novel thermodynamic phases such as the Bose glass. On a macroscopic scale the vortex system exhibits self-organized criticality, with both the spatial and the temporal scale accessible to experimental investigations.

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Section: Intrinsic Pinning and Creepmentioning

confidence: 95%

Vortices in high-temperature superconductors

et al. 1994

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“…In contrast to the aforementioned magnetization data on YBCO and Bi-2:2:1:2, and some low-temperature magnetic measurements on Tl-2:2:2:3 ceramics [11], here we report detailed transport measurements of the vortex dynamics in the Tl-2:2:2:3 system with linear defects created by heavy-ion irradiation. At the optimum defect density, we measure a thousandfold enhancement in Jc at 77 K for --2.5 T field aligned parallel to the defects.…”

mentioning

confidence: 93%

Giant suppression of flux-flow resistivity in heavy-ion irradiatedTl2Ba2
Budhani
¹
,
Suenaga
²
,
Liou
³

1992
Phys. Rev. Lett.
149
1
45
0
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“…It has been reported previously that the effective columnar defect can be produced by energetic ion irradiation when the electronic stopping power exceeds 10keV/nm [2,3]. the shortest edge direction.…”

Section: Heavy-ion Irradiationmentioning

confidence: 99%

“…Due to the predominant contribution of high electron energy loss of the high-energy heavy ions, columnar defects are introduced into the target materials, and they play an important role in magnetic flux pinning [1,2]. Due to the predominant contribution of high electron energy loss of the high-energy heavy ions, columnar defects are introduced into the target materials, and they play an important role in magnetic flux pinning [1,2].…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Spectrochemical Analysis of Columnar Defects Formed in Bi₂Sr₂CaCu₂O_x by Swift Heavy Ion Irradiation

et al. 2003

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Single-crystal specimen of high-temperature superconductor Bi 2 Sr 2 CaCu 2 O x was irradiated with 3.5 GeV Xe ions at room temperature up to 1.0 x 10 11 ion/cm 2 . Significant enhancement of magnetization by the irradiation was confirmed. The irradiated specimens were studied by using a high-resolution transmission electron microscope with field emission electron gun (FE-TEM), and, also, with an energy dispersive x-ray analyzer (EDS). Columnar defects with diameter of about 6 nm were observed along the incident ion tracks. By nanoscale high-resolution x-ray spectrochemical analysis across the columnar defect, enrichment of Cu and depletion of Bi, Sr and Ca in the columnar defect center, and vice versa in the outskirts of the defect, was found for the first time. Oxygen depletion in the defect, and increased distribution outside of the defect were also found by electron energy loss spectroscopy. This experimental evidence suggests that the columnar defects are formed as a consequence of Coulomb explosion induced by the electronic excitation of the high-energy heavy ions.

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GeV-heavy ion irradiation effects in thallium-based superconducting copper oxides

Cited by 56 publications

References 17 publications

Vortices in high-temperature superconductors

Vortices in high-temperature superconductors

Giant suppression of flux-flow resistivity in heavy-ion irradiatedTl2Ba2
Budhani
¹
,
Suenaga
²
,
Liou
³

1992
Phys. Rev. Lett.
149
1
45
0
View full text Add to dashboard Cite

High-Resolution Spectrochemical Analysis of Columnar Defects Formed in Bi₂Sr₂CaCu₂O_x by Swift Heavy Ion Irradiation

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GeV-heavy ion irradiation effects in thallium-based superconducting copper oxides

Cited by 56 publications

References 17 publications

Vortices in high-temperature superconductors

Vortices in high-temperature superconductors

Giant suppression of flux-flow resistivity in heavy-ion irradiatedTl2Ba2Budhani1, Suenaga2, Liou3 1992Phys. Rev. Lett.1491450View full textAdd to dashboardCite

High-Resolution Spectrochemical Analysis of Columnar Defects Formed in Bi2Sr2CaCu2Ox by Swift Heavy Ion Irradiation

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Giant suppression of flux-flow resistivity in heavy-ion irradiatedTl2Ba2
Budhani
¹
,
Suenaga
²
,
Liou
³

1992
Phys. Rev. Lett.
149
1
45
0
View full text Add to dashboard Cite

High-Resolution Spectrochemical Analysis of Columnar Defects Formed in Bi₂Sr₂CaCu₂O_x by Swift Heavy Ion Irradiation