Crossing point of the magnetization versus temperature curves and the Meissner fraction in granularLa1.9Sr0.1

Observation of anisotropic diamagnetism above the superconducting transition in iron pnictide Ba1−xKxFeMosqueira1, Dancausa2, Vidal3 et al. 2011Phys. Rev. BSelf Cite2921401View full textAdd to dashboardCite

“…This allowed to determine the anisotropy factor from the anisotropy of the precursor diamagnetism with a ∼ 0.5% uncertainty. 14 As a first magnetic characterization, in Fig. 1 it is presented the temperature dependence of the zero-field-cooled ZFC and field-cooled FC magnetic susceptibilities, measured with a magnetic field of 0.5 mT perpendicular to the ab planes.…”

First Observation for a Cuprate Superconductor of Fluctuation-Induced Diamagnetism Well Inside the Finite-Magnetic-Field Regime

“…The grain aligned LaSCO sample used in our present FD experiments was obtained by using the procedure described before [17]. The general aspects of this type of sample may be seen in Refs.…”

“…The general aspects of this type of sample may be seen in Refs. [17] and [18]. The main difference of this sample from the other grain aligned LaSCO samples we have already used in other types of experiments [17,19] is its bigger mass, of the order of 50 mg, i.e., typically 2 orders of magnitude larger than most of the HTSC crystals used until now by different groups in other FD measurements [11][12][13].…”

“…[17] and [18]. The main difference of this sample from the other grain aligned LaSCO samples we have already used in other types of experiments [17,19] is its bigger mass, of the order of 50 mg, i.e., typically 2 orders of magnitude larger than most of the HTSC crystals used until now by different groups in other FD measurements [11][12][13]. However, in spite of its big mass, x-ray diffraction patterns of the sample we have chosen for the present experiments exhibit only the ͑00l͒ peaks, which indicates excellent alignment of the grains.…”

Structural andTcinhomogeneities inherent to doping inLa2−xSrxMosqueira1, Cabo2, Vidal3 2009Phys. Rev. BSelf Cite2811670View full textAdd to dashboardCite

“…8,9 The anomalies observed in some cases, in particular under low magnetic fields, could be easily explained in terms of T c -inhomogeneities with long characteristic lengths [much larger than ξ ab (0)], which do not directly affect the superconducting transition own nature. 7,10 Measurements of the in-plane paraconductivity 11 and of the heat capacity around T c 12 in these underdoped cuprates, together with analyses of the effects of T c -inhomogeneities with long characteristic lengths and of the background choice, 7,13,14 fully agree with these conclusions.…”