688 research outputs found
Field-Induced Magnetostructural Transitions in Antiferromagnetic Fe1+yTe1-xSx
The transport and structural properties of Fe1+yTe1-xSx (x=0, 0.05, and 0.10)
crystals were studied in pulsed magnetic fields up to 65 T. The application of
high magnetic fields results in positive magnetoresistance effect with
prominent hystereses in the antiferromagnetic state. Polarizing microscope
images obtained at high magnetic fields showed simultaneous occurrence of
structural transitions. These results indicate that magnetoelastic coupling is
the origin of the bicollinear magnetic order in iron chalcogenides.Comment: 5 pages, 5 figures, accepted for publication in Journal of the
Physical Society of Japa
Evolution of superconductivity by oxygen annealing in FeTe0.8S0.2
Oxygen annealing dramatically improved the superconducting properties of
solid-state-reacted FeTe0.8S0.2, which showed only a broad onset of
superconducting transition just after the synthesis. The zero resistivity
appeared and reached 8.5 K by the oxygen annealing at 200\degree C. The
superconducting volume fraction was also enhanced from 0 to almost 100%. The
lattice constants were compressed by the oxygen annealing, indicating that the
evolution of bulk superconductivity in FeTe0.8S0.2 was correlated to the
shrinkage of lattice.Comment: 13 pages, 6 figure
Role of defects and disorder in the half-metallic full-Heusler compounds
Half-metallic ferromagnets and especially the full-Heusler alloys containing
Co are at the center of scientific research due to their potential applications
in spintronics. For realistic devices it is important to control accurately the
creation of defects in these alloys. We review some of our late results on the
role of defects and impurities in these compounds. More precisely we present
results for the following cases (i) doping and disorder in CoCr(Mn)Al(Si)
alloys, (ii) half-metallic ferrimagnetism appeared due to the creation of
Cr(Mn) antisites in these alloys, (iii) Co-doping in MnVAl(Si) alloys
leading to half-metallic antiferromagnetism, and finally (iv) the occurrence of
vacancies in the full-Heusler alloys containing Co and Mn. These results are
susceptible of encouraging further theoretical and experimental research in the
properties of these compounds.Comment: Chapter intended for a book with contributions of the invited
speakers of the International Conference on Nanoscale Magnetism 2007. Revised
version contains new figure
Towards New Half-Metallic Systems: Zinc-Blende Compounds of Transition Elements with N, P, As, Sb, S, Se, and Te
We report systematic first-principles calculations for ordered zinc-blende
compounds of the transition metal elements V, Cr, Mn with the sp elements N, P,
As, Sb, S, Se, Te, motivated by recent fabrication of zinc-blende CrAs, CrSb,
and MnAs. They show ferromagnetic half-metallic behavior for a wide range of
lattice constants. We discuss the origin and trends of half-metallicity,
present the calculated equilibrium lattice constants, and examine the
half-metallic behavior of their transition element terminated (001) surfaces.Comment: 2nd Version: lattice constants calculations added, text revise
Possible Superconducting Symmetry and Magnetic Correlations in K0.8Fe2Se2: A 77Se-NMR Study
We report ^77Se-NMR measurements in the recent discovered K_0.8Fe_2Se_2 with
the superconducting transition temperature T_c=32 K. The characteristic point
of this system is that the high density of state is located in the vicinity of
the Fermi level. The comparison between Knight shift and nuclear spin lattice
relaxation rate 1/T_1 shows that the antiferromagnetic spin correlation is not
strong in this system, but it is reasonable to consider that its development
toward low temperatures occurs. 1/T_1 in the superconducting state can be
reproduced well by an s+- wave model, but a d wave model also roughly
reproduces the data. Non exponential behavior in 1/T_1 at low temperatures
disagrees with a single isotropic gap.Comment: 4 pages, 4 figures, some mistakes were correcte
Role of defects on the electronic and magnetic properties of CrAs/InAs and CrAs/CdSe half-metallic interfaces
We present an extended study of single impurity atoms at the interface
between the half-metallic ferromagnetic zinc-blende CrAs compound and the
zinc-blende binary InAs and CdSe semiconductors in the form of very thin
multilayers. Contrary to the case of impurities in the perfect bulk CrAs
studied in [I. Galanakis and S.G. Pouliasis, J. Magn. Magn. Mat. 321 (2009)
1084] defects at the interfaces do not alter in general the half-metallic
character of the perfect systems. The only exception are Void impurities at Cr
or In(Cd) sites which lead, due to the lower-dimensionality of the interfaces
with respect to the bulk CrAs, to a shift of the bands of the nearest
neighboring As(Se) atom to higher energies and thus to the loss of the
half-metallicity. But Void impurities are Schottky-type and should exhibit high
formation energies and thus we expect the interfaces in the case of thin
multilayers to exhibit a robust half-metallic character
Effects of Disorder in FeSe : An Ab Initio Study
Using the coherent-potential approximation, we have studied the effects of
excess Fe, Se-deficiency, and substitutions of S, Te on Se sub-lattice and Co,
Ni and Cu on Fe sub-lattice in FeSe. Our results show that (i) a small amount
of excess Fe substantially disorders the Fe-derived bands while Se-deficiency
affects mainly the Se-derived bands, (ii) the substitution of S or Te enhances
the possibility of Fermi surface nesting, specially in FeSeTe,
in spite of disordering the Se-derived bands, (iii) the electron doping through
Co, Ni or Cu disorders the system and pushes down the Fe-derived bands, thereby
destroying the possibility of Fermi surface nesting. A comparison of these
results with the rigid-band, virtual-crystal and supercell approximations
reveals the importance of describing disorder with the coherent-potential
approximation.Comment: Redone VCA calculations, and some minor changes. (Accepted for
publication in Journal of Physics:Condensed Matter
Proximity to Fermi-surface topological change in superconducting LaO0.54F0.46BiS2
The electronic structure of nearly optimally-doped novel superconductor
LaOFBiS ( = 0.46) was investigated using
angle-resolved photoemission spectroscopy (ARPES). We clearly observed band
dispersions from 2 to 6 eV binding energy and near the Fermi level (), which are well reproduced by first principles calculations when
the spin-orbit coupling is taken into account. The ARPES intensity map near
shows a square-like distribution around the (Z) point
in addition to electronlike Fermi surface (FS) sheets around the X(R) point,
indicating that FS of LaOFBiS is in close proximity to
the theoretically-predicted topological change.Comment: 6 pages, 3 figures, + supplemental materia
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