Temperature evolution of crystal field interactions across the Jahn-Teller transition in aLa7/8Sr1/8MnO3single crystal

2003 ◽  
Vol 68 (21) ◽  
Author(s):  
G. Alejandro ◽  
M. C. G. Passeggi ◽  
D. Vega ◽  
C. A. Ramos ◽  
M. T. Causa ◽  
...  
Keyword(s):  
Crystal Field ◽  
Temperature Evolution ◽  
Teller Transition ◽  
Jahn Teller

Phase Transitions and Spin Relaxation in La0.95Sr0.05MnO3

2003 ◽  
Vol 17 (10n12) ◽  
pp. 459-467 ◽  
Author(s):  
B. I. Kochelaev ◽  
E. Shilova ◽  
J. Deisenhofer ◽  
H.-A. Krug von Nidda ◽  
A. Loidl ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Model Calculation ◽  
Crystal Field ◽  
Spin Relaxation ◽  
Paramagnetic Resonance ◽  
Resonance Linewidth ◽  
Teller Transition ◽  
Jahn Teller

We present a model calculation of the paramagnetic-resonance linewidth in La 0.95 Sr 0.05 MnO 3. Both the temperature and the angular dependencies can be described by contributions from the crystal field due to the cooperative Jahn–Teller transition.

Orbital Order and Spin Relaxation in La0.95Sr0.05MnO3

2003 ◽  
Vol 17 (10n12) ◽  
pp. 469-477
Author(s):  
B. I. Kochelaev ◽  
E. Shilova ◽  
J. Deisenhofer ◽  
H.-A. Krug von Nidda ◽  
A. Loidl ◽  
...  
Keyword(s):  
Crystal Field ◽  
Angular Dependence ◽  
Spin Relaxation ◽  
Critical Behavior ◽  
Orbital Order ◽  
Paramagnetic Resonance ◽  
Teller Distortion ◽  
Teller Transition ◽  
Jahn Teller ◽  
Jahn Teller Distortion

We analyze the temperature and angular dependence of the paramagnetic-resonance linewidth of La 0.95 Sr 0.05 MnO 3. The observed anisotropy can be well described by the crystal field contributions originated by the Jahn–Teller distortion. The critical behavior of the linewidth at the Jahn–Teller transition is found to be directly related with the orbital order.

Utilizing total scattering to study the Jahn-Teller transition in La1-xCaxMnO3

2007 ◽  
Vol 2007 (suppl_26) ◽  
pp. 429-434
Author(s):  
E. S. Božin ◽  
X. Qiu ◽  
R. J. Worhatch ◽  
G. Paglia ◽  
M. Schmidt ◽  
...  
Keyword(s):  
Total Scattering ◽  
Teller Transition ◽  
Jahn Teller

Optical and magnetic studies of TmAsO 4

1984 ◽  
Vol 394 (1806) ◽  
pp. 69-85 ◽  
Keyword(s):  
Field Theory ◽  
Crystal Field ◽  
Mean Field Theory ◽  
Mean Field ◽  
Optical Measurements ◽  
Optical Absorption Spectroscopy ◽  
Magnetic Studies ◽  
Teller Distortion ◽  
Principal Axes ◽  
Jahn Teller

In the tetragonal paramagnet thulium arsenate, TmAsO 4 , the lowest manifold of the Tm 3+ ion, 4f 12 , 3 H 6 is split by the crystal field, which leaves a ground doublet with a nearby singlet at 13.8 cm -1 . Below a critical temperature T D = 6.13(3) K, a cooperative Jahn-Teller distortion splits the ground doublet, which produces domains with principal axes [110], [11̄0]. The behaviour of the three lowest levels has been studied by using high resolution optical absorption spectroscopy with magnetic fields up to 9 T along the [001] axis and in the (001) plane. Enhanced nuclear magnetic resonance of the single stable isotope 169 Tm has also been observed in these directions. Parallel to the c -axis the results confirm that from 1.6 to 4.2 K the magnitude of the Jahn-Teller splitting follows mean field theory to within 0.2 %. New values of the parameters give good agreement with mean field theory, but in the (001) plane the n. m. r. and optical measurements disagree with each other and with calculations based on the crystal field parameters of Bingham et al . (1984), which indicates that other interactions may be present.

Jahn-Teller transition ofLiMn2O4studied by x-ray-absorption spectroscopy

1998 ◽  
Vol 58 (1) ◽  
pp. 8-11 ◽  
Author(s):  
Hirotaka Yamaguchi ◽  
Atsuo Yamada ◽  
Hiromoto Uwe
Keyword(s):  
Absorption Spectroscopy ◽  
X Ray ◽  
Teller Transition ◽  
Jahn Teller ◽  
X Ray Absorption

Jahn‐Teller Transition in PrCu2

1976 ◽  
Author(s):  
K. Andres ◽  
P. S. Wang ◽  
Y. H. Wong ◽  
B. Lüthi ◽  
H. R. Ott
Keyword(s):  
Teller Transition ◽  
Jahn Teller

Orbital ground state, crystal field splittings, and magnetic hyperfine interactions in iron(II) fluorosulphate

1977 ◽  
Vol 55 (1) ◽  
pp. 115-121 ◽  
Author(s):  
John R. Sams ◽  
Robert C. Thompson ◽  
Tsang Bik Tsin
Keyword(s):  
Crystal Field ◽  
Ground State ◽  
Hyperfine Interactions ◽  
Excited Level ◽  
Quadrupole Coupling Constant ◽  
Spin Coupling ◽  
Rhombic Distortion ◽  
Constant E ◽  
Jahn Teller ◽  
Spin Spin Coupling

Magnetic susceptibilities between 80 and 300 K and 57Fe Mössbauer parameters between 4.2 and 295 K are reported for Fe(SO3F)2. These data have been analysed via a crystal field model including spin–orbit and spin–spin coupling. The compound is trigonally distorted by an elongation along the [111] axis of the FeO6 octahedron, and the ground state is the orbital doublet [Formula: see text]. The quadrupole coupling constant e2qQ is positive, and no rhombic distortion could be detected. The electronic spectrum shows a splitting of the 5Eg excited level, presumably by a dynamic Jahn–Teller effect, and [Formula: see text] Attempts to fit a low-temperature magnetic perturbation Mössbauer spectrum using a pseudo-spin Hamiltonian were only partially successful, but suggest that the g tensor is highly anisotropic with [Formula: see text] and that the internal hyperfine field is small. Spin relaxation in Fe(SO3F)2 is fast at all temperatures down to 4.2 K and in applied magnetic fields of up to 5.0 T.

Jahn-Teller Phase Transitions in Non-Stoichiometric Oxides with Perovskite Structure: Effect of Mechanical Activation

2013 ◽  
Vol 334-335 ◽  
pp. 353-358
Author(s):  
Anatoly Yakovlevich Fishman ◽  
Nickolai Tkachev
Keyword(s):  
Phase Transitions ◽  
Mechanical Activation ◽  
Perovskite Structure ◽  
Microscopic Description ◽  
Oxide Systems ◽  
Teller Transition ◽  
Structure Phase ◽  
Jahn Teller ◽  
Nanostructural State ◽  
Theoretical Results

Structure phase transitions in nonstoichiometry oxides with perovskite structure were considered. The microscopic description of cooperative Jahn-Teller transition was suggested and the effects caused by mechanical activation of oxide systems (their conversion into nanostructural state, acceleration of oxidation-renewal reactions and immiscibility) were analized. The correspondence of the theoretical results to the data of experiment on phase states of mechanically activated oxide NdMnO3is shown.

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