Intergrain Effects in the AC Susceptibility of Polycrystalline LaFeAsO0.94F0.06

被引：16

作者：

Bonsignore, G. ^{[1
,2
]}

Gallitto, A. Agliolo ^{[1
,2
]}

Vigni, M. Li ^{[1
,2
]}

Luo, J. L. ^{[3
]}

Chen, G. F. ^{[3
]}

Wang, N. L. ^{[3
]}

Shovkun, D. V. ^{[4
]}

机构：

[1] Univ Palermo, CNISM, I-90123 Palermo, Italy

[2] Univ Palermo, Dipartimento Sci Fis & Astron, I-90123 Palermo, Italy

[3] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China

[4] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2011年 / 162卷 / 1-2期

关键词：

Oxypnictides; AC susceptibility; Granularity; Josephson junction array; HIGH-TEMPERATURE SUPERCONDUCTORS; MAGNETIC-FIELD DEPENDENCE; CRITICAL-CURRENT-DENSITY; HIGH-TC SUPERCONDUCTORS; FLUX-CREEP; FREQUENCY-DEPENDENCE; GRAIN-BOUNDARIES; CRITICAL-STATE; YBA2CU3O7; MODELS;

D O I：

10.1007/s10909-010-0220-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The AC susceptibility, chi, at zero DC magnetic field of a polycrystalline sample of LaFeAsO0.94F0.06 (T-c approximate to 24 K) has been investigated as a function of the temperature, the amplitude of the AC magnetic field (in the range H-ac = 0.003 Oe divided by 4 Oe) and the frequency (in the range f = 10 kHz divided by 100 kHz). The chi(T) curve exhibits the typical two-step transition arising from the combined response of superconducting grains and intergranular weak-coupled medium. The intergranular part of chi strongly depends on both the amplitude and the frequency of the AC driving field, from few Kelvin below T-c down to T = 4.2 K. Our results show that, in the investigated sample, the intergrain critical current is not determined by pinning of Josephson vortices but by Josephson critical current across neighboring grains.

引用

页码：40 / 51

页数：12

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