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Title: Physical properties, crystal and magnetic structure of layered Fe[subscript 1.11]Te[subscript 1;#8722;x]Se[subscript x] superconductors

Abstract

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 anmore » anisotropic thermal expansion anomaly is observed around 100 K.« less

Authors:
; ; ; ; ; ; ;  [1];  [2];  [2]
  1. (BARC)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGN
OSTI Identifier:
1051121
Resource Type:
Journal Article
Journal Name:
Eur. Phys. J. B
Additional Journal Information:
Journal Volume: 82; Journal Issue: 2011; Journal ID: ISSN 1434-6028
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; CONFIGURATION; CRITICAL CURRENT; CRITICAL FIELD; DIFFRACTION; MAGNETIC FIELDS; NEUTRON DIFFRACTION; NEUTRONS; PHYSICAL PROPERTIES; SUPERCONDUCTORS; TEMPERATURE DEPENDENCE; THERMAL EXPANSION; THERMODYNAMICS; VECTORS

Citation Formats

Xiao, Y., Su, Y., Kumar, C.M.N., Ritter, C., Mittal, R., Price, S., Perßon, J., Brückel, Th., Julich), and ILL). Physical properties, crystal and magnetic structure of layered Fe[subscript 1.11]Te[subscript 1;#8722;x]Se[subscript x] superconductors. United States: N. p., 2012. Web. doi:10.1140/epjb/e2011-10567-6.
Xiao, Y., Su, Y., Kumar, C.M.N., Ritter, C., Mittal, R., Price, S., Perßon, J., Brückel, Th., Julich), & ILL). Physical properties, crystal and magnetic structure of layered Fe[subscript 1.11]Te[subscript 1;#8722;x]Se[subscript x] superconductors. United States. doi:10.1140/epjb/e2011-10567-6.
Xiao, Y., Su, Y., Kumar, C.M.N., Ritter, C., Mittal, R., Price, S., Perßon, J., Brückel, Th., Julich), and ILL). Tue . "Physical properties, crystal and magnetic structure of layered Fe[subscript 1.11]Te[subscript 1;#8722;x]Se[subscript x] superconductors". United States. doi:10.1140/epjb/e2011-10567-6.
@article{osti_1051121,
title = {Physical properties, crystal and magnetic structure of layered Fe[subscript 1.11]Te[subscript 1;#8722;x]Se[subscript x] superconductors},
author = {Xiao, Y. and Su, Y. and Kumar, C.M.N. and Ritter, C. and Mittal, R. and Price, S. and Perßon, J. and Brückel, Th. and Julich) and ILL)},
abstractNote = {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.},
doi = {10.1140/epjb/e2011-10567-6},
journal = {Eur. Phys. J. B},
issn = {1434-6028},
number = 2011,
volume = 82,
place = {United States},
year = {2012},
month = {10}
}