55 research outputs found
Magnetic Phase Transitions in the double spin-chains compound
We report high-resolution x-ray diffraction, muon-spin-rotation spectroscopic
and specific heat measurements in the double spin-chains compound . The x-ray diffraction results show that the crystal structure of
~is orthorhombic down to T=10K. Anisotropic line-broadening of
the diffraction peaks is observed, indicating disorder along the spin chains.
Muon spin relaxation and specific heat measurements show that
\~undergoes a phase transition to a magnetic ordered state at .
The specific heat data exhibits a second -like peak at , which increases with increasing magnetic field similarly way to
that found in spin-ladder compounds.Comment: 6 pages, 6 fifures, to appear in Physica
Conductivity, weak ferromagnetism and charge instability in single crystal
The temperature dependence of resistivity, magnetization and electron-spin
resonance of the single crystal were measured in temperature
range of . Magnetization hysteresis in applied magnetic field
up to 0.7 T at , irreversible temperature behavior of
magnetization and resistivity were found . The obtained data were explained in
terms of degenerate tight binding model using random phase approximation. The
contribution of holes in and bands of manganese ions to the
conductivity, optical absorbtion spectra and charge instability in were studied. Charge susceptibility maxima resulted from the competition of
the on-site Coulomb interaction between the holes in different orbitals and
small hybridization of sub-bands were calculated at .Comment: 6 pages, 12 figure
Reply to Comment on "Competition between helimagnetism and commensurate quantum spin correlations in LiCu2O2"
Exchanged interactions in recently observed helical structure in LiCu2O2 is
probed by inelastic neutron scattering. The main conlusions of Refs. [1,2] are
confirmed: nn interactions in single chains are ferromagnetic and frustrated by
nnn antiferromagnetic ones. However, in apparent disagreement with Refs. [1,2]
double-chain interactions are found to be of the same order of magnitude as the
single-chain ones, and thus involved in the frustration mechanism.
[1] Drechsler et al., cond-mat/0411418. [2] A. Gippius et al. Phys. Rev. B 70
(2004), R01426; cond-mat/0312576.Comment: Reply to the Comment by S.-L. Drechsler, J. Malek, J. Richter, A.S.
Moskvin, A.A. Gippius, H. Rosner, cond-mat/041141
Coexistence of dimerization and long-range magnetic order in the quantum antiferromagnetic compound LiCu2O2: inelastic light scattering study
Raman scattering studies of the frustrated spin chain system
LiCuO are reported. Two transitions into a magnetically ordered
phase (taken place at temperatures 9 K and 24 K) have been
confirmed from the analysis of optical properties of the samples.
Interestingly, two different magnetic excitations, seen at 100 and 110
cm in the magnetically ordered phase superimpose each other
independently, indicating a coherent coexistence of long-range magnetic order
and dimerization. The observed phenomenon is attributed to magnetostructural
peculiarities of LiCuO leading to the intrinsic presence of
nonmagnetic impurities on a nanometer scale. Furthermore, magnetic impurities
play a significant role in driving the transition from an incommensurate state
to a N\'{e}el ordered one at 9 K.Comment: 5 pages, 4 figures. submitted to PRB; Manuscript is improve
Exchange Interactions in the Cr3+–Cr3+ Ion Pair in the ABO3 (A = Ga, In, Sc) Diamagnetic Matrix (Обменные взаимодействия в паре ионов Cr3+−Cr3+ в диамагнитной матрице ABO3 (A = Ga, In,Sc))
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The exchange interactions in the Cr3+–Cr3+ ion pairs in the isostructural ABO3 (A = Ga, In, Sc)
diamagnetic compounds have been examined using the magnetic resonance technique. The values of bilinear
and biquadratic exchange interactions have been determined. It is shown that the biquadratic exchange in the
Cr3+–Cr3+ pair in these compounds is caused by the exchange striction
Electron Paramagnetic Resonance of Cr3+ Ions in Single Crystals of Yttrium Aluminum Borate YAl3(BO3)4
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.Single crystal of yttrium aluminum borate YAl3(BO3)4 doped with chromium ions (1 at.%) was studied using electron paramagnetic resonance spectroscopy. It is shown that chromium ions introduced into the sample occupy yttrium ion sites in the crystal structure. The parameters of the spin Hamiltonian of Cr3+ ions in the YAl3(BO3)4 matrix are determined at different temperatures. The sign of the fine structure parameter D allows the conclusion that the chromium ions in YAl3(BO3)4 single crystals have an easy-plane anisotropy
Electron Paramagnetic Resonance of Cr3+ Ions in ABO3 (A = Sc, Lu, In) Diamagnetic Crystals
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.A magnetic resonance method is applied to the investigation of a number of isostructural diamagnetic
compounds ABO3 (A = Sc, Lu, In) with small additions of Cr3+ ions (S = 1/2) sufficient to observe single-
ion spectra. It is shown that the resonance spectra for isolated Cr3+ ions can be described to a good accuracy
by the ordinary axial spin Hamiltonian for 3d ions in octahedral oxygen environment. The parameters of
the spin Hamiltonian are determined. It is established that Cr3+ ions in these crystals are characterized by
easy-axis-type anisotropy
Electron Paramagnetic Resonance of Cr3+ Ions in ABO3 (A = Sc, Lu, In) Diamagnetic Crystals
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.A magnetic resonance method is applied to the investigation of a number of isostructural diamagnetic
compounds ABO3 (A = Sc, Lu, In) with small additions of Cr3+ ions (S = 1/2) sufficient to observe single-
ion spectra. It is shown that the resonance spectra for isolated Cr3+ ions can be described to a good accuracy
by the ordinary axial spin Hamiltonian for 3d ions in octahedral oxygen environment. The parameters of
the spin Hamiltonian are determined. It is established that Cr3+ ions in these crystals are characterized by
easy-axis-type anisotropy
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