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024 7 _ |a 10.1140/epjb/e2011-10567-6
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037 _ _ |a PreJuSER-19020
041 _ _ |a eng
082 _ _ |a 530
084 _ _ |2 WoS
|a Physics, Condensed Matter
100 1 _ |a Xiao, Y.
|b 0
|u FZJ
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245 _ _ |a Physical properties, crystal and magnetic structure of layered Fe(1.11)Te(1-) (x) Se (x) superconductors
260 _ _ |a Berlin
|b Springer
|c 2011
300 _ _ |a 113-121
336 7 _ |a Journal Article
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440 _ 0 |a European Physical Journal B
|x 1434-6028
|0 1982
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|v 82
500 _ _ |a Record converted from VDB: 12.11.2012
520 _ _ |a The physical and structural properties of Fe1.11Te and Fe1.11Te0.5Se0.5 have been investigated by means of X-ray and neutron diffraction as well as physical property measurements. For the Fe1.11Te compound, the structure distortion from a tetragonal to monoclinic phase takes place at 64 K accompanied with the onset of antiferromagnetic order upon cooling. The magnetic structure of the monoclinic phase was confirmed to be of antiferromagnetic configuration with a propagation vector k = (1/2, 0, 1/2) based on Rietveld refinement of neutron powder diffraction data. The structural/magnetic transitions are also clearly visible in magnetic, electronic and thermodynamic measurements. For superconducting Fe1.11Te0.5Se0.5 compound, the superconducting transition with T (c) = 13.4 K is observed in the resistivity and ac susceptibility measurements. The upper critical field H (c2) is obtained by measuring the resistivity under different magnetic fields. The Kim's critical state model is adopted to analyze the temperature dependence of the ac susceptibility and the intergranular critical current density is calculated as a function of both field amplitude and temperature. Neutron diffraction results show that Fe1.11Te0.5Se0.5 crystalizes in tetragonal structure at 300 K as in the parent compound Fe1.11Te and no structural distortion is detected upon cooling to 2 K. However an anisotropic thermal expansion anomaly is observed around 100 K.
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700 1 _ |a Su, Y.
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700 1 _ |a Kumar, C. M. N.
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700 1 _ |a Ritter, C.
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700 1 _ |a Mittal, R.
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700 1 _ |a Price, S.
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700 1 _ |a Perßon, J.
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700 1 _ |a Brückel, T.
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773 _ _ |a 10.1140/epjb/e2011-10567-6
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|t The @European physical journal / B
|v 82
|y 2011
|x 1434-6028
856 7 _ |u http://dx.doi.org/10.1140/epjb/e2011-10567-6
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