Harmonic susceptibilities and pinning properties of MgB2 bulk superconductors

Carmine Senatore; Massimiliano Polichetti; Danilo Zola; Tiziana Di Matteo; Giovanni Giunchi; Sandro Pace

doi:10.1016/S0921-4534(02)02706-5

Harmonic susceptibilities and pinning properties of MgB₂ bulk superconductors

Carmine Senatore^*, Massimiliano Polichetti, Danilo Zola, Tiziana Di Matteo, Giovanni Giunchi, Sandro Pace

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

3 Citations (Scopus)

Abstract

The fundamental and third harmonics of the ac magnetic susceptibility have been studied on MgB₂ bulk superconductors, obtained by reactive liquid infiltration. In particular, measurements performed as a function of temperature, dc magnetic field, ac field amplitude and frequency have been compared with susceptibility curves obtained by means of numerical simulations of the non-linear diffusion equation for the magnetic field. The experimental frequency dependence of the χ₁″(T) and |χ₃|(T) peak amplitude cannot be explained by frequency dependent critical state models. On the contrary, we have shown that the measured curves are correctly derived using a diffusion coefficient dominated by a creep process within the framework of the vortex glass approach.

Original language	English
Pages (from-to)	161-162
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	388-389
DOIs	https://doi.org/10.1016/S0921-4534(02)02706-5
Publication status	Published - May 2003
Externally published	Yes
Event	proceedings of the 23rd international conference on low temper - Hiroshima, Japan Duration: 20 Aug 2002 → 27 Aug 2002

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title = "Harmonic susceptibilities and pinning properties of MgB2 bulk superconductors",

abstract = "The fundamental and third harmonics of the ac magnetic susceptibility have been studied on MgB2 bulk superconductors, obtained by reactive liquid infiltration. In particular, measurements performed as a function of temperature, dc magnetic field, ac field amplitude and frequency have been compared with susceptibility curves obtained by means of numerical simulations of the non-linear diffusion equation for the magnetic field. The experimental frequency dependence of the χ1″(T) and |χ3|(T) peak amplitude cannot be explained by frequency dependent critical state models. On the contrary, we have shown that the measured curves are correctly derived using a diffusion coefficient dominated by a creep process within the framework of the vortex glass approach.",

keywords = "Ac susceptibility, Flux dynamics, MgB",

author = "Carmine Senatore and Massimiliano Polichetti and Danilo Zola and \{Di Matteo\}, Tiziana and Giovanni Giunchi and Sandro Pace",

year = "2003",

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doi = "10.1016/S0921-4534(02)02706-5",

language = "English",

volume = "388-389",

pages = "161--162",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier B.V.",

note = "proceedings of the 23rd international conference on low temper ; Conference date: 20-08-2002 Through 27-08-2002",

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TY - JOUR

T1 - Harmonic susceptibilities and pinning properties of MgB2 bulk superconductors

AU - Senatore, Carmine

AU - Polichetti, Massimiliano

AU - Zola, Danilo

AU - Di Matteo, Tiziana

AU - Giunchi, Giovanni

AU - Pace, Sandro

PY - 2003/5

Y1 - 2003/5

N2 - The fundamental and third harmonics of the ac magnetic susceptibility have been studied on MgB2 bulk superconductors, obtained by reactive liquid infiltration. In particular, measurements performed as a function of temperature, dc magnetic field, ac field amplitude and frequency have been compared with susceptibility curves obtained by means of numerical simulations of the non-linear diffusion equation for the magnetic field. The experimental frequency dependence of the χ1″(T) and |χ3|(T) peak amplitude cannot be explained by frequency dependent critical state models. On the contrary, we have shown that the measured curves are correctly derived using a diffusion coefficient dominated by a creep process within the framework of the vortex glass approach.

AB - The fundamental and third harmonics of the ac magnetic susceptibility have been studied on MgB2 bulk superconductors, obtained by reactive liquid infiltration. In particular, measurements performed as a function of temperature, dc magnetic field, ac field amplitude and frequency have been compared with susceptibility curves obtained by means of numerical simulations of the non-linear diffusion equation for the magnetic field. The experimental frequency dependence of the χ1″(T) and |χ3|(T) peak amplitude cannot be explained by frequency dependent critical state models. On the contrary, we have shown that the measured curves are correctly derived using a diffusion coefficient dominated by a creep process within the framework of the vortex glass approach.

KW - Ac susceptibility

KW - Flux dynamics

KW - MgB

UR - https://www.scopus.com/pages/publications/0038188557

U2 - 10.1016/S0921-4534(02)02706-5

DO - 10.1016/S0921-4534(02)02706-5

M3 - Conference article

SN - 0921-4534

VL - 388-389

SP - 161

EP - 162

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

T2 - proceedings of the 23rd international conference on low temper

Y2 - 20 August 2002 through 27 August 2002

ER -

Harmonic susceptibilities and pinning properties of MgB₂ bulk superconductors

Abstract

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