χ″ peaks, flux pinning, and the irreversibility line in high-temperature superconductors

Flippen, R. B.; Askew, T.R.; Fendrich, J. A.; Vlcek, B. M.

doi:10.1016/0921-4534(94)90177-5

Cited by 9 publications

(5 citation statements)

References 20 publications

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“…Additional peaks have sometimes been observed, especially in the out-of-phase component of the fundamental susceptibility for HTSC materials [3], which could be attributed to several different loss mechanisms. On the other hand, we observed a similar effect only in the thirdharmonic and not in the fundamental susceptibility.…”

Section: Resultsmentioning

confidence: 99%

“…It is an inductive and noncontactless measurement that involves screening currents flowing in the entire volume of the sample. Although there is a vast amount of work in the literature (see for example [1][2][3][4]) on the magnetic response of high temperature superconductors (HTSCs), the interpretation of ac susceptibility is model dependent and there are some controversial issues concerning the occurrence of the peak in the out-of-phase component of the susceptibility. Müller et al [5], Malozemoff et al [6] and others have suggested that the peak in χ 1 can be monitored to determine a so called 'irreversibility line' which separates the regions of reversible from irreversible magnetic behaviour.…”

Section: Introductionmentioning

confidence: 99%

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A study of the nonlinearity in magnetic response of

Gençer¹,

Mutlu²,

Belenli³

et al. 1996

Supercond. Sci. Technol.

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We have carried out low-field ac measurements of harmonic susceptibilities and ac magnetization of a single-phase partially melt-textured Bi 2 Sr 2 CaCu 2 O 8 high-temperature superconductor over a wide range of temperatures, field amplitudes and measuring frequencies. Both the fundamental and third-harmonic susceptibility versus temperature and ac magnetization at fixed temperatures close to T c exhibit strong ac field amplitude and small frequency dependences. In the third-harmonic susceptibility, we observed a double-peak feature in the vicinity of T c as a function of the applied ac field. This strong field dependence is associated with depinning of vortices at some B and T in different superconducting matrices, which involves different ac loss mechanisms. Experimental results are compared with predictions of some existing theoretical models.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study of the nonlinearity in magnetic response of

Gençer¹,

Mutlu²,

Belenli³

et al. 1996

Supercond. Sci. Technol.

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“…Two peaks are observed for % 15 and %20 Ti additions. Additional peaks have sometimes been observed, especially in the out-of-phase component of the fundamental susceptibility for high temperature superconductors [15], which could be attributed to several different loss mechanisms.…”

Section: Resultsmentioning

confidence: 99%

“…For larger ac fields, some explanations for the occurrence of the double peaks in AC susceptibility are possible. First, the occurrence of a small tail becoming a progressively larger peak with increasing Ti-content may be related to the weak inter-domain coupling as in a granular superconductor [15]. In this scenario, for sufficiently large ac amplitudes, the upper peak in out-of-phase component is associated with the irreversible motion in and out of the domains themselves, while the lower peak is related to irreversibility of flux line motion in regions between superconducting domains (assumed to be composed of well connected grains).…”

Section: Resultsmentioning

confidence: 99%

Low-Field Behavior of Ti-Added<tex>$rm MgB_2/rm Cu$</tex>Superconducting Wires

Gençer

Kılıç

Okur

et al. 2005

IEEE Trans. Appl. Supercond.

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“…This peak coincides with the irreversibility line since there is no extrinsic pinning. 16 Thus, the T m versus H lines represent the flux pinning boundary for the sample in the temperature-field plane, below which the vortices are pinned.…”

Section: Methodsmentioning

confidence: 99%

TEMPERATURE AND FIELD VARIATION OF AC SUSCEPTIBILITY ON Mn DOPED YBa₂Cu₃O_7-δ SUPERCONDUCTOR

Samuel

Bai

2003

Int. J. Mod. Phys. B

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Temperature variation of AC susceptibility has been measured on YBa 2 (Cu 1−x -Mnx) 3 O 7−δ samples with x values 0, 0.01, 0.015, 0.02, 0.025, 0.035 and 0.05, YBa 2 (Cu 0.075 Fe 0.025 ) 3 O 7−δ and YBa 2 (Cu 0.075 Ni 0.025 ) 3 O 7−δ samples in the temperature range from 10 to 120 K. The weak link (inter-granular) and granular responses are distinctly pronounced at the studied fields of 0.2 to 30 Oe. The temperature variation of weak link critical current density Jcw(T ) indicates the inter-granular coupling to be of superconductor-insulator-superconductor (SIS) type. The weak link AC loss calculated from the imaginary part of the AC susceptibility χ (T ) is found to exhibit a power relation with temperature, with an average exponent value of 1.96. Field variation of AC susceptibility measured at 50 K and 77 K were well modelled with Kim's relation and the Jcw at 50 K and 77 K were estimated from the fit parameters.

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χ″ peaks, flux pinning, and the irreversibility line in high-temperature superconductors

Cited by 9 publications

References 20 publications

A study of the nonlinearity in magnetic response of

A study of the nonlinearity in magnetic response of

Low-Field Behavior of Ti-Added<tex>$rm MgB_2/rm Cu$</tex>Superconducting Wires

TEMPERATURE AND FIELD VARIATION OF AC SUSCEPTIBILITY ON Mn DOPED YBa₂Cu₃O_7-δ SUPERCONDUCTOR

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χ″ peaks, flux pinning, and the irreversibility line in high-temperature superconductors

Cited by 9 publications

References 20 publications

A study of the nonlinearity in magnetic response of

A study of the nonlinearity in magnetic response of

Low-Field Behavior of Ti-Added&lt;tex&gt;$rm MgB_2/rm Cu$&lt;/tex&gt;Superconducting Wires

TEMPERATURE AND FIELD VARIATION OF AC SUSCEPTIBILITY ON Mn DOPED YBa2Cu3O7-δ SUPERCONDUCTOR

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Low-Field Behavior of Ti-Added<tex>$rm MgB_2/rm Cu$</tex>Superconducting Wires

TEMPERATURE AND FIELD VARIATION OF AC SUSCEPTIBILITY ON Mn DOPED YBa₂Cu₃O_7-δ SUPERCONDUCTOR