14 research outputs found
Non-conventional superconducting fluctuations in Ba(Fe1-xRhx)2As2 iron-based superconductors
We measured the static uniform spin susceptibility of
Ba(FeRh)As iron-based superconductors, over a broad range
of doping () and magnetic fields. At small fields ( 1 kOe) we observed, above the transition temperature , the occurrence
of precursor diamagnetism, which is not ascribable to the Ginzburg-Landau
theory. On the contrary, our data fit a phase fluctuation model, which has been
used to interpret a similar phenomenology occurring in the high- cuprate
superconductors. On the other hand, in presence of strong fields the
unconventional fluctuating diamagnetism is suppressed, whereas 3D fluctuations
are found, in agreement with literature
Superconducting phase fluctuations in SmFeAsOF from diamagnetism at low magnetic field above
Superconducting fluctuations (SF) in SmFeAsOF (characterized
by superconducting transition temperature K) are
investigated by means of isothermal high-resolution dc magnetization
measurements. The diamagnetic response to magnetic fields up to 1 T above
is similar to what previously reported for underdoped cuprate
superconductors and it can be justified in terms of metastable superconducting
islands at non-zero order parameter lacking of long-range coherence because of
strong phase fluctuations. In the high-field regime ( T) scaling
arguments predicted on the basis of the Ginzburg-Landau theory of conventional
SF are found to be applicable, at variance with what observed in the low-field
regime. This fact enlightens that two different phenomena are simultaneously
present in the fluctuating diamagnetism, namely the phase SF of novel character
and the conventional SF. High magnetic fields (1.5 T )
are found to suppress the former while leaving unaltered the latter one.Comment: 7 pages, 5 figure
Non-conventional superconducting fluctuations in Ba(Fe1-xRhx)(2)As-2 iron-based superconductors
We measured the static uniform spin susceptibility of Ba(Fe1−xRhx)2As2 iron-based superconductors, over a broad range of doping (0.041 ≤ x ≤ 0.094) and magnetic fields. At small fields (H ≤ 1 kOe) we observed, above the transition temperature Tc, the occurrence of precursor diamagnetism, which is not ascribable to the Ginzburg–Landau theory. On the contrary, our data agree with a phase fluctuation model, which has been used to interpret a similar phenomenology occurring in the high-Tc cuprate superconductors. Additionally, in the presence of strong fields, the unconventional fluctuating diamagnetism is suppressed, whereas Ginzburg–Landau fluctuations are found, in agreement with literature.This is a peer-reviewed, un-copyedited version of an article accepted for publication/published in Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at DOI: 10.1088/0953-8984/26/40/405703. Posted with permission.</p
Sobre a distribuição geográfica do Meloidogyne coffeicolla Lord e Zamith no Estado do Paraná
O presente trabalho refere-se a análise de raÃzes de cafeeiros para verificação da presença do nematóide do cafeeiro e dá sua distribuição geográfica no Estado do Paraná.
ABSTRACT
This paper describes the occurence and geographical distribution of nernatodes Meloidogyne coffekolla Lord & Zamith on coffee roots in the State of Parana.
RÉSUMÉ
Ce travail scerne Ianalyse dos racines du caféyeur por une vérification de a présence du nématoide MeI&dogyne coffeicolla Lord e Zamith et pour évalier sa distribution géographique dans IÈtat du Paraná
Sobre a distribuição geográfica do Meloidogyne coffeicolla Lord e Zamith no Estado do Paraná
O presente trabalho refere-se a análise de raÃzes de cafeeiros para verificação da presença do nematóide do cafeeiro e dá sua distribuição geográfica no Estado do Paraná.
ABSTRACT
This paper describes the occurence and geographical distribution of nernatodes Meloidogyne coffekolla Lord & Zamith on coffee roots in the State of Parana.
RÉSUMÉ
Ce travail scerne Ianalyse dos racines du caféyeur por une vérification de a présence du nématoide MeI&dogyne coffeicolla Lord e Zamith et pour évalier sa distribution géographique dans IÈtat du Paraná