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As-75 NMR local probe study of magnetism in (Eu1-xKx)Fe2As2

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Title As-75 NMR local probe study of magnetism in (Eu1-xKx)Fe2As2
 
Creator DEY, T
KHUNTIA, P
MAHAJAN, AV
ANUPAM
HOSSAIN, Z
 
Subject SPIN-LATTICE RELAXATION
SUPERCONDUCTIVITY
 
Description As-75 NMR measurements were performed as a function of temperature and doping in Eu1-xKxFe2As2 (x = 0.5, 0.7) samples. The large Eu2+ moments and their fluctuations are found to dominate the As-75 NMR properties. The As-75 nuclei close to the Eu2+ moments likely have a very short spin-spin relaxation time (T-2) and are wiped out of our measurement window. The As-75 nuclei relatively far from Eu2+ moments are probed in this study. Increasing the Eu content progressively decreases the signal intensity with no signal found for the full-Eu sample (x = 0). The large As-75 NMR linewidth arises from an inhomogeneous magnetic environment around them. The spin lattice relaxation rate (1/T-1) for x = 0.5 and 0.7 samples is nearly independent of temperature above 100 K and results from a dipolar coupling to paramagnetic fluctuations of the Eu2+ moments. The behavior of 1/T-1 at lower temperatures has contributions from the antiferromagnetic fluctuations of the Eu2+ moments as also the fluctuations intrinsic to the FeAs planes and from superconductivity.
 
Publisher SPRINGER
 
Date 2014-10-16T14:33:12Z
2014-10-16T14:33:12Z
2013
 
Type Article
 
Identifier EUROPEAN PHYSICAL JOURNAL B, 86(11)
1434-6028
1434-6036
http://dx.doi.org/10.1140/epjb/e2013-40483-6
http://dspace.library.iitb.ac.in/jspui/handle/100/15794
 
Language en