AC susceptibility of high-Tc superconductors

Yang, Y.; Beduz, C.; Yi, Z.; Scurlock, R.G.

doi:10.1016/0921-4534(92)90480-z

Cited by 18 publications

(5 citation statements)

References 13 publications

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“…In this temperature region J , depends on a reduced temperature (1 -T/T,) which is not characteristic of a junction current. Similar results have been shown using a current induction technique (Kupfer et al [7]) and by our magnetisation measurements [3].…”

supporting

confidence: 92%

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DC and AC transport current measurements up to 140 A in melt-grown YBCO superconductors

Yang¹,

Ashworth²,

Beduz³

et al. 1990

Supercond. Sci. Technol.

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Transport currents of up to 140 A have been injected into melt-grown YBCO to measure AC and DC critical currents. Values of critical current densities of 16000 A cm-2 (zero field), 2000 A cm-2 (1 T) and 550 A cm-2 (5 T) were obtained at 77 K. The 50 Hz AC critical current densities are also reported, with values of 23000 A cm-2 and 12000 A cm-2 (RMS) in applied fields of 1 and 5 T respectively at 77 K. Silver contact pads enabled steady-state currents of up to 7000 A per cm2 of contact area to be injected into the sample without any observable heating effects in applied fields up to 5 T. It should be noted that the 50 Hz results are believed to correspond to the onset of flux depinning in contrast with the DC measurements where a 3 mu V cm-1 detection level for flux creep was applied.

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supporting

confidence: 92%

“…Following previous magnetisation measurements [3] on melt-grown YBCO multi-granular samples prepared in the Institute of Cryogenics which yielded current densities up to 15000 A cm-2, we have now succeeded in measuring transport currents in a sample of 0.5 mm2 cross section in magnetic fields up to 5 T.…”

mentioning

confidence: 99%

DC and AC transport current measurements up to 140 A in melt-grown YBCO superconductors

Yang¹,

Ashworth²,

Beduz³

et al. 1990

Supercond. Sci. Technol.

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“…4(a)), which are probably attributed to the development of inter-grain Josephson coupling within the polycrystalline sample. 10 For SrRuO 3 , a pronounced peak in ∆V y ∼ χ = dM/dH due to ferromagnetic ordering is observed at 162 ± 1 K, in agreement with the known ferromagnetic transition temperature T FM 160 K. 11 In addition, a broad peak centered at around 100 K is also observed, which is attributable to glassy nature of the magnetic moments. 12 Figure 5 presents susceptometer responses of polycrystalline pure aluminum (99.99%, The Nilaco Corporation) and single crystalline Sr 2 RuO 4 .…”

Section: Performance Of the Susceptometersupporting

confidence: 68%

Compact AC susceptometer for fast sample characterization down to 0.1 K

Yonezawa

Higuchi

Sugimoto

et al. 2015

Review of Scientific Instruments

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We report a new design of an AC magnetic susceptometer compatible with the Physical Properties Measurement System (PPMS) by Quantum Design, as well as with its adiabatic demagnetization refrigerator option. With the elaborate compact design, the susceptometer allows simple and quick sample mounting process. The high performance of the susceptometer down to 0.1 K is demonstrated using several superconducting and magnetic materials. This susceptometer provides a method to quickly investigate qualities of a large number of samples in the wide temperature range between 0.1 and 300 K.

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“…The small coherence length of HTSCs implies that inhomogeneities such as structural ones (twin boundaries, stacking faults, grain boundaries, etc) will influence both the normal state and superconducting properties [27][28][29][30][31]. Due to the role of the heat treatment condition in enhancing the homogeneity of the HTSCs published elsewhere, the idea of this work is to study the effect of sintering conditions on the thermoelectric properties of polycrystalline samples of composition Bi 1.75 Pb 0.35 Sr 2 Ca 2 Cu 3 O 10 .…”

Section: Introductionmentioning

confidence: 99%

The thermoelectric properties of Bi-2223 superconductors sintered at different conditions

Ibrahim¹,

Saleh²,

Ahmed³

2008

Supercond. Sci. Technol.

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Structural examinations and thermoelectric power measurements were carried out on Bi1.75Pb0.35Sr2Ca2Cu3O10 samples sintered at different conditions. The thermoelectric power of all samples was found to be positive, and it increases almost linearly with the decrease of temperature up to ∼140 K, before falling to zero at Tco. However, the thermoelectric power changes slightly with increasing sintering temperature and time. The normal state results are analyzed in terms of a two-band model with an additional term that is linear in T. The effects of sintering temperature and time on the parameters related to this model have been investigated.

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AC susceptibility of high-Tc superconductors

Cited by 18 publications

References 13 publications

DC and AC transport current measurements up to 140 A in melt-grown YBCO superconductors

DC and AC transport current measurements up to 140 A in melt-grown YBCO superconductors

Compact AC susceptometer for fast sample characterization down to 0.1 K

The thermoelectric properties of Bi-2223 superconductors sintered at different conditions

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