Analysis of high-Tc superconductor compounds on the nanometre scale

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Due to the small coherence lengths of the high-Tc compounds, effective pinning sites are defects or particles of nanometer size according to ξ3. Integral magnetic measurements of the magnetization as a function of temperature in large applied magnetic fields (up to 7 T) have revealed that practically all high-Tc compounds exhibit spatial inhomogeneities, which can be caused by either oxygen deficiency (YBCO), solid solutions of Nd/Ba (NdBCO and light rare earth 123-type compounds), intergrowths (Bi-based superconductors) or chemical doping by pair-breaking dopants like Zn, Pr, etc. Such local variations of the super-conducting properties should be visible in low-temperature scanning tunneling microscopy experiments, and their effects on flux pinning could be studied in a direct way. Various irradiation experiments by neutrons, protons, and heavy-ions have enabled the artificial introduction of effective pinning sites into the high-Tc samples, thus creating many different observations in the integral magnetic data. Furthermore, several sub-structure formations are found in several multi-light rare earth 123-superconductor samples by means of AFM investigations, which may play an important role for the considerably improved critical current densities in these materials. From all these observations, we construct a pinning diagram explaining many features observed in high-Tc samples.

Original languageEnglish
Pages (from-to)1726-1731
Number of pages6
JournalPhysica Status Solidi C: Conferences
Volume2
Issue number5
DOIs
Publication statusPublished - 2005 Nov 7
Externally publishedYes

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rare earth elements
flux pinning
hypoxia
magnetic measurement
scanning tunneling microscopy
critical current
heavy ions
inhomogeneity
solid solutions
diagrams
atomic force microscopy
current density
neutrons
conduction
magnetization
irradiation
protons
defects
magnetic fields
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Analysis of high-Tc superconductor compounds on the nanometre scale. / Koblischka, Michael Rudolf; Hartmann, U.

In: Physica Status Solidi C: Conferences, Vol. 2, No. 5, 07.11.2005, p. 1726-1731.

Research output: Contribution to journalArticle

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