The Jahn-Teller effect and magnetism: transition metal compounds

Кugel, K. I.; Khomskii, D. I.

doi:10.3367/ufnr.0136.198204c.0621

Cited by 312 publications

(271 citation statements)

References 11 publications

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“…These compounds contain ions with orbital degeneracy or Jahn-Teller (JT) ions (in our case Mn 3+ ) [1]. Thus their properties differ appreciably from those of the corresponding substances with the «ordinary» ions: the crystal structure turn out to be distorted, structural phase transitions and transitions in a magnetic subsystem [2][3][4][5][6] are frequently observed in them, and in many cases they have anomalously strong magnetic anisotropy and magnetostriction [7,8].…”

Section: Introductionmentioning

confidence: 99%

Magnetic phase transitions in the system La1−xBixMnO3+λ

Troyanchuk

Mantytskaja

Szymczak

et al. 2002

Low Temperature Physics

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The crystal structure and magnetic properties of the La1−xBixMnO3+λ system (0⩽x⩽1;λ⩽0.08) are studied as functions of the oxygen and bismuth contents. In oxidized samples La1−xBixMnO3+λ a phase transition from a ferromagnetic state (rhombohedric phase) to a state of the spin glass type (quasitetragonal phase) is observed with increase of the bismuth concentration. The reduced samples La1−xBixMnO3 are weak ferromagnets down to x⩽0.6 and then transform into a ferromagnetic state. It is supposed that the Bi3+ ions stabilize the dx2−y2 orbitals in the nearest Mn3+ ions whereas the dz2 orbitals of the La3+ ions are stabilized. The orbitally disordered phases and dx2−y2-orbitally ordered phases are ferromagnetic, the dz2-orbitally ordered phases show antiferromagnetic ordering, and the state of the orbital glass type corresponds to a state of the spin glass type.

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Section: Introductionmentioning

confidence: 99%

Magnetic phase transitions in the system La1−xBixMnO3+λ

Troyanchuk

Mantytskaja

Szymczak

et al. 2002

Low Temperature Physics

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“…If we take into account the anisotropy due to orbital ordering together with that due to magnetic ordering, we obtain a result similar to that in x4.1. Instead of the tensor n kl , we should, however, introduce in this case the order-parameter tensor D ij ( i ( j , where ( means pseudospin (see Kugel & Homsky, 1982). If we take into account all three types of local anisotropies simultaneously and apply the approach developed above, we obtain:…”

Section: The Susceptibility In the Case Of Several Anisotropic Factorsmentioning

confidence: 99%

Resonant X-ray scattering in the presence of several anisotropic factors

Овчинникова

Дмитриенко

2000

Acta Cryst Sect A

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The general form of the X-ray susceptibility tensor near absorption edges is found when several anisotropic factors, such as the anisotropy of local atomic environment, magnetic ordering and orbital ordering, simultaneously exist in a crystal. Different phenomenological approaches are used to obtain the explicit form of the susceptibility tensor and to ®nd the contributions from each anisotropic factor separately as well as`combined' terms owing to their simultaneous existence. The results of the theoretical treatment are applied to the resonant diffraction by La 0.5 Sr 1.5 MnO 4 below the Ne Â el temperature, where charge and orbital ordering coexist with anisotropy of local atomic environment and magnetic ordering.

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“…This leads to the different structural transitions and the corresponding property anomalies [5,6]. On another hand the magnetic intersite interaction in case of the local electronic orbital degeneracy results in the possibility of different unusual magnetic structures (for example, because of the electron exchange at orbital degeneracy [7]). The combination of the mentioned above interactions in Jahn-Teller perovskite and spinel crystals causes the unordinary richness of their properties.…”

Section: Introductionmentioning

confidence: 99%

Elastic Anomalies in Jahn-Teller Crystals with Competing Structural Orderings

Kaplan

Zimmerman

2013

J. Phys.: Conf. Ser.

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Abstract. Crystals of transition metal compounds with perovskite and spinel structures are characterized by several competing electron interactions responsible for different structural and magnetic orderings. The shape of the acoustic anomaly temperature dependences allows to distinguish between them and to estimate the difference between the structural and magnetic transition critical temperatures. IntroductionThe interest to the crystals of the transition metal compounds with perovskite and spinel structures permanently continues to grow for a significant period of time [1]. It is related to a range of surprising discoveries of unusual properties of these materials. The anomalous properties of perovskite and spinel structure crystals are the direct consequence of the electronic orbital degeneracy or pseudo-degeneracy of the transition metal ions. The corresponding electronic states are very sensitive to the local distortions (Jahn-Teller effect [2,3]) and to their correlation through the crystal phonons (cooperative Jahn-Teller effect [4]). This leads to the different structural transitions and the corresponding property anomalies [5,6]. On another hand the magnetic intersite interaction in case of the local electronic orbital degeneracy results in the possibility of different unusual magnetic structures (for example, because of the electron exchange at orbital degeneracy [7]). The combination of the mentioned above interactions in Jahn-Teller

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The Jahn-Teller effect and magnetism: transition metal compounds

Cited by 312 publications

References 11 publications

Magnetic phase transitions in the system La1−xBixMnO3+λ

Magnetic phase transitions in the system La1−xBixMnO3+λ

Resonant X-ray scattering in the presence of several anisotropic factors

Elastic Anomalies in Jahn-Teller Crystals with Competing Structural Orderings

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