Inhomogeneous charge distributions and phase separation in manganites

Kagan, M. Yu.; Kugel', Kliment I.

doi:10.3367/ufnr.0171.200106a.0577

Cited by 120 publications

(42 citation statements)

References 56 publications

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“…At high temperatures, this state survives until the ferromagnetism vanishes in the vicinity of the critical temperature, associated with the self-localisation energy of an electron in the cluster. The similar droplets (fluctuons), originally anticipated in the papers by Krivoglaz [42,43] and for magnetic systems discussed in [44], can appear as features in the temperature dependence of magnetic susceptibility and resistivity.…”

Section: Discussionsupporting

confidence: 62%

Formation of metallic magnetic clusters in a Kondo-lattice metal: Evidence from an optical study

Kovaleva

Кugel

Bazhenov

et al. 2012

Sci Rep

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Magnetic materials are usually divided into two classes: those with localised magnetic moments, and those with itinerant charge carriers. We present a comprehensive experimental (spectroscopic ellipsomerty) and theoretical study to demonstrate that these two types of magnetism do not only coexist but complement each other in the Kondo-lattice metal, Tb2PdSi3. In this material the itinerant charge carriers interact with large localised magnetic moments of Tb(4f) states, forming complex magnetic lattices at low temperatures, which we associate with self-organisation of magnetic clusters. The formation of magnetic clusters results in low-energy optical spectral weight shifts, which correspond to opening of the pseudogap in the conduction band of the itinerant charge carriers and development of the low- and high-spin intersite electronic transitions. This phenomenon, driven by self-trapping of electrons by magnetic fluctuations, could be common in correlated metals, including besides Kondo-lattice metals, Fe-based and cuprate superconductors.

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Section: Discussionsupporting

confidence: 62%

Formation of metallic magnetic clusters in a Kondo-lattice metal: Evidence from an optical study

Kovaleva

Кugel

Bazhenov

et al. 2012

Sci Rep

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“…The charge carriers and ferromagnetic Mn 3+ -Mn 4+ ion pairs originating from doping are not distributed in TBMO statistically. Due to the double exchange interaction resulting in the phase separation [13] they form conducting ferromagnetic domains inside the volume of TMO.…”

Section: Discussionmentioning

confidence: 99%

Low Temperature Ferroelectric and Magnetic Properties of Doped Multiferroic Tb0.95Bi0.05MnO3

Андреева

Санина

Vakhrushev

et al. 2014

Lecture Notes in Computer Science

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Abstract. Multiferroics are very promising materials for application in RF/microwave electronic devices. Electrical tuning of magnetism due to strong magnetoelectric coupling in these materials gives an opportunity to use them in reconfigurable microwave devices, ultra-low power electronics and magnetoelectric random access memories (MERAMs). Tb 0.95 Bi 0.05 MnO 3 (TMNO) multiferroic is a solid solution of TbMnO 3 and BiMnO 3 , the interest to investigation of this nanocomposite material is caused by the possibility to obtain the multiferroic with close temperatures of magnetic and ferroelectric ordering which are higher than in pure TbMnO 3 . Results of TMNO crystal investigations obtained using cryogenic magnetic force and piezopresponse force microscopy techniques are presented. An existence of ferroelectric and ferromagnetic ordering in TMNO at low temperatures was observed.

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“…There is a common belief that complex interactions between charge, spin, orbital, and lattice degrees of freedom may lead to inhomogeneous ground state with charge and phase separation. The role of these inhomogeneous states in the anomalous transport and magnetic properties in manganites [1,2,3,4,5,6] and in high temperature superconductors [7,8,9,10] is often discussed in literature. It was shown that inhomogeneous states may appear above Curie temperature and new characteristic temperature T * was introduced [5,7].…”

Section: Pacs Numbersmentioning

confidence: 99%

“…It was shown that inhomogeneous states may appear above Curie temperature and new characteristic temperature T * was introduced [5,7]. Note, that the tendency to the phase separation is widely discussed for manganites [4,5,6], as well as for high-temperature superconductors [7], microscopic origin of this anomalous behavior is far from understanding. The origin and the temperature range of this phenomena is still an open problem [3,4,5,6,8,9,10,11].…”

mentioning

confidence: 99%

“…Note, that the tendency to the phase separation is widely discussed for manganites [4,5,6], as well as for high-temperature superconductors [7], microscopic origin of this anomalous behavior is far from understanding. The origin and the temperature range of this phenomena is still an open problem [3,4,5,6,8,9,10,11]. In this paper we discuss the tendency and conditions of the formation of inhomogeneous states with the spacial charge localization and the phase separation within the phenomenological Ginzburg-Landau formalism and clarify the role of the Coulomb interaction in this phenomena.…”

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confidence: 99%

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Localized charge inhomogeneities and phase separation near a second-order phase transition

Kabanov

Мамин

Shaposhnikova

2009

J. Exp. Theor. Phys.

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Localized charged states and phase segregation are described in the framework of the phenomenological Ginzburg-Landau theory of phase transitions. The Coulomb interactions determines the charge distribution and the characteristic length of the phase separated states. The phase separation with charge segregation becomes possible because of the large dielectric constant and the small density of extra charge in the range of charge localization. The phase diagram is calculated and the energy gain of the phase separated state is estimated. The role of the Coulomb interaction is elucidated. PACS numbers:There is a common belief that complex interactions between charge, spin, orbital, and lattice degrees of freedom may lead to inhomogeneous ground state with charge and phase separation. The role of these inhomogeneous states in the anomalous transport and magnetic properties in manganites [1,2,3,4,5,6] and in high temperature superconductors [7,8,9,10] is often discussed in literature. It was shown that inhomogeneous states may appear above Curie temperature and new characteristic temperature T * was introduced [5,7]. Note, that the tendency to the phase separation is widely discussed for manganites [4,5,6], as well as for high-temperature superconductors [7], microscopic origin of this anomalous behavior is far from understanding. The origin and the temperature range of this phenomena is still an open problem [3,4,5,6,8,9,10,11]. In this paper we discuss the tendency and conditions of the formation of inhomogeneous states with the spacial charge localization and the phase separation within the phenomenological Ginzburg-Landau formalism and clarify the role of the Coulomb interaction in this phenomena.

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Inhomogeneous charge distributions and phase separation in manganites

Cited by 120 publications

References 56 publications

Formation of metallic magnetic clusters in a Kondo-lattice metal: Evidence from an optical study

Formation of metallic magnetic clusters in a Kondo-lattice metal: Evidence from an optical study

Low Temperature Ferroelectric and Magnetic Properties of Doped Multiferroic Tb0.95Bi0.05MnO3

Localized charge inhomogeneities and phase separation near a second-order phase transition

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