Vortex dynamics and the critical current density in NdFeAsO0.9F0.1 single crystals

Adamski, Andrzej; Nassief, A.R.; Krellner, C.; Abdel-Hafiez, M.

doi:10.1016/j.jmmm.2017.10.024

Cited by 1 publication

(1 citation statement)

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“…The growth of NdFeAsO 1-x F x single crystals was done according to the previously reported method by Adamski et al [16,17], with some modifications on both the flux stoichiometry and the temperature profile. Taking into consideration the safety precautions for handling arsenic, all procedures related to the sample preparation were performed under an argon atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Single-Crystal Growth and Small Anisotropy of the Lower Critical Field in Oxypnictides: NdFeAsO1 − xFx

Hanna

Abdel-Hafiez

2020

Crystals

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High-quality single crystals of the unconventional superconductor NdFeAsO1 − xFx were grown. We developed a new optimized flux technique to overcome the difficulties in single-crystal growth and the sample quality limitations of NdFeAsO1 − xFx. The normal state of the F-doped samples exhibits simple metallic behavior upon cooling down from room temperature, followed by a sharp superconducting transition. The values of residual resistivity ratio (RRR) is 3.2, 6.4, and 10.3 for x = 0.1, 0.15, and 0.2, respectively. Both the large RRR and the narrow superconducting transition signpost the high quality of the crystals. We have examined the in- and out-of-plane lower critical fields, and the field at which vortices penetrate the sample of NdFeAsO1 − xFx (x = 0.1). The anisotropy ratio [γHc1 (0)] increased slightly with increasing temperature from 0.8 Tc to Tc. The temperature dependence of the first vortex penetration field was obtained under the static magnetic field, H, parallel to the c- and ab- axis, and pronounced changes in the Hc1(T) curvature were observed, which are attributed to the multi-band superconductivity.

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Section: Methodsmentioning

confidence: 99%