33 research outputs found
Ab-inito study on different phases of ferromagnetic CeMnNi4
Using first-principles density functional calculations, we study the possible
phases of CeMnNi and show that the ground state is ferromagnetic. We
observed the hexagonal phase to be lowest in energy whereas experimentally
observed cubic phase lies slightly higher in energy. We optimized the structure
in both phases and in all different magnetic states to explore the possibility
of the structural and magnetic phase transitions at ground state. We do not
find any phase transitions between the magnetic and non-magnetic phases. The
calculated structural, magnetic properties of cubic phase are in excellent
agreement with experiments. Further, we do not observe half metallic behavior
in any of the phases. However, the cubic phase does have fewer density of
states for down-spin component giving a possibility of forming half metallic
phase artificially, introducing vacancies, and disorder in lattice
CeMnNi4: A soft ferromagnet with a high degree of transport spin polarization
In this letter we introduce a new soft ferromagnetic compound, i.e. CeMnNi4,
which exhibits a large moment (~4.95mu_B/Mn) and high degree of spin
polarization. The system has a ferromagnetic transition temperature of 148K.
Isothermal magnetization measurements at 5K reveal that the material is a soft
ferromagnet with a magnetization saturating at about 500Oe and a coercive field
of < 5 Oe. We determine the transport spin polarization of this material from
Point Contact Andreev Reflection measurements to be 66% thereby making this
material potentially important for spintronic applications.Comment: pdf file with figures Revised Version submitted to AP
Electronic structure and transport properties of CeNi9In2
We investigated CeNi9In2 compound, which has been considered as a mixed
valence (MV) system. Electrical resistivity vs. temperature variation was
analysed in terms of the model proposed by Freimuth for systems with unstable
4f shell. At low temperature the resistivity dependence is consistent with a
Fermi liquid state with a contribution characteristic of electron-phonon
interaction. Ultraviolet photoemission spectroscopy (UPS) studies of the
valence band did not reveal a Kondo peak down to 14 K. A difference of the
spectra obtained with photon energies of low and high photoionization cross
sections for Ce 4f electrons indicated that 4f states are located mainly close
to the Fermi energy. The peaks related to f_{5/2}^1 and f_{7/2}^1 final states
cannot be resolved but form a plateau between -0.3 eV and the Fermi energy.
X-ray photoemission spectroscopy (XPS) studies were realized for the cerium 3d
level. The analysis of XPS spectra within the Gunnarsson-Sh\"onhammer theory
yielded a hybridization parameter of 104 meV and non-integer f level
occupation, being close to 3. Calculations of partial densities of states were
realized by a full potential local orbital (FPLO) method. They confirm that the
valence band is dominated by Ni 3d states and are in general agreement with the
experiment except for the behavior of f-electrons.Comment: 10 pages, 5 figure
Influence of Co doping on crystal and magnetic properties of Gd_{2}Cu_{2}In
Physical properties of (x = 0.1, 0.2, 0.3) samples are investigated. The paper brings results of X-ray diffraction, magnetometric as well as specific heat studies. It was found that only sample with x = 0.1 exhibits desired crystal structure. Other compositions show existence of impurities due to lack of dissolution Co atoms. For sample the Curie temperature of 92.5 K was evidenced. Thus, an enhancement of ferromagnetic correlations with comparison to sample was evidenced. It was found that sample exhibits magnetocaloric effect within broad temperature range
Substitution Study on the Coherent Kondo State in CeCuIn
Ternary alloys CeCuIn were studied by means of magnetic and electrical resistivity measurements. In CeCuIn a coherent Kondo state without long-range magnetic order develops at low temperatures. It transforms into an incoherent Kondo state upon small substitution of In for Cu