Relationship Between Crystal Symmetry and Magnetic Properties of Ionic Compounds Containing<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>

Goodenough, John B; Wold, A.; Arnott, R. J.; Menyuk, N.

doi:10.1103/physrev.124.373

Cited by 718 publications

(420 citation statements)

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“…The crystal structures of the end members, LaMnO 3 and LaCoO 3 were found to be orthorhombic (space group Pnma, Z = 4) [16] and rhombohedral (space group R c 3 , Z = 2) [17], respectively. The compounds with 0.15 < x < 0.50 have been found to be orthorhombic [18,19]. When x > 0.50 and near to 1.0, the compounds have a rhombohedral structure [19].…”

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confidence: 99%

“…When x > 0.50 and near to 1.0, the compounds have a rhombohedral structure [19]. Around 0.5 doping level, the compounds show a mixture of two structural phases, the orthorhombic and rhombohedral [19]. The idealized cubic perovskite structure of the LaMn(Co)O 3 crystal is shown in Fig.…”

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“…The structural properties of LaMn 1-x Co x O 3 were characterized in several publications [15][16][17][18][19]. The crystal structures of the end members, LaMnO 3 and LaCoO 3 were found to be orthorhombic (space group Pnma, Z = 4) [16] and rhombohedral (space group R c 3 , Z = 2) [17], respectively.…”

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Phonon Raman scattering in LaMn1−xCoxO3 (x=0, 0.2, 0.3, 0.4, and 1.0)

Gnezdilov

Yeremenko

Pashkevich³

et al. 2003

Low Temperature Physics

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The Raman-active phonons in perovskite-like LaMn 1-x Co x O 3 (x = 0, 0.2, 0.3, 0.4, and 1.0) were studied by measuring Raman spectra at temperatures of 295 and 5 K. The changes in the spectra with Co doping are correlated with the decrease of orthorhombic distortions. Surprisingly more phonon lines than allowed for the rhombohedral LaCoO 3 structure were observed. The manganese perovskites of the type R 1-x A x MnO 3 (R = rare earth, A = Ca, Sr, Ba, or Pb) have been subject of scientific investigations for many decades. Recently, this interest has been renewed due to the observation of a colossal magnetoresistance [1,2], charge, spin, and orbital ordering effects as a function of Mn 3+ /Mn 4+ ratio [3][4][5]. Another system, Mn-site-doped, with the composition LaMn 1-x D x O 3 (D = Cr, Fe, Co, or Ni) was intensively studied in the 60's, but colossal magnetoresistance was not mentioned in them until the 90's [6]. While Raman spectra of La-site-doped compounds have been reported in numerous of publications [7][8][9][10][11][12][13], surprisingly nothing was done on Mn-site-doped compounds. In this work we report the results of an optical phonon study in the perovskite oxides LaMn 1-x Co x O 3 (x = 0, 0.2, 0.3, 0.4, and 1.0). The end member of this system, namely LaCoO 3 has been the subject of continuing interest since the 50's due to unusual magnetic properties and two spin-state transitions [14,15].

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Phonon Raman scattering in LaMn1−xCoxO3 (x=0, 0.2, 0.3, 0.4, and 1.0)

Gnezdilov

Yeremenko

Pashkevich³

et al. 2003

Low Temperature Physics

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“…Here we mostly concentrate on non-linearity and irreversible effects observed in the electric conductivity. [11,12]. With increase in temperature, materials undergo phase transformation to rhombohedral or quasi-cubic phase.…”

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confidence: 99%

Irreversible effects in LaGa1−xMnxO3

Ногинова

Chen

Etheridge

2005

Solid State Communications

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Abstract. Quasi-irreversible increase in the electrical conductivity is observed in single crystals of LaGa 1-x Mn x O 3. The effect lasts for long time at room temperature and can be erased by heating of the crystal above the phase transition temperature. We explain the observed effects in terms of ionization and local lattice distortion processes.PACS Codes/ Keywords: Manganites, Non-linear effects, Irreversibility, 72.20, INTRODUCTIONIn the past few years, perovskite manganites (such as La 1-x Sr x MnO 3 , La 1-x Ca x MnO 3 , etc.) have attracted much scientific attention due to effect of the colossal magnetoresistance (CMR) effect and complex diagram of phase transitions in these materials [1]. As was recently reported, some low-doped manganites exhibit effect of irreversibility in transport and magnetic properties induced by optical illumination, thermal, electric or magnetic field cycling in the range of ferromagnetic transition [2][3][4][5][6][7]. These memory effects are explained with intrinsic coexistence of two or more phases with different magnetic and transport properties on the submicrometer scale and microstructural changes in the phases content. On the other hand, high-resistivity perovskite materials with very low concentration of Mn ions also exhibit interesting memory effects. Mn doped yttrium orthoaluminates, Mn:YAlO 3 , high-quality optical single crystals, demonstrate significant changes in color and photorefractive index induced by photo illumination [8,9]. These effects are quasipermanent, lasting for many years at room temperature, and completely erasable by heating the crystal up to ~ 230 C. To better understand the origin of the irreversibility in perovskites with different content of Mn ions, we have studied the series of LaGa 1-x Mn x O 3 with concentration of Mn ions varying from 2% to 100%. In contrast to the well-known manganite CMR systems, in our single crystal materials Mn ions are diluted by nonmagnetic Ga ions, which enter the same place in the crystal structure as Mn ions. As was reported earlier [10], the low-field conductivity of such systems can be described in terms of the small polaron hopping model. Here we mostly concentrate on non-linearity and irreversible effects observed in the electric conductivity.

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“…The double-exchange model (Anderson & Hasegawa, 1955;DeGennes, 1960) was proposed to explain the simultaneous onset of metallic conductivity and ferromagnetism as doping concentration x is increased across the insulator-metal transition point of x ∼ 0.2. It was also understood then that there is a strong correlation between the Mn-O-Mn bond length and bond angle and the magnetic coupling of adjacent Mn ions (Goodenough et al, 1961). A Jahn-Teller distortion lifts the double-degeneracy of Mn d-electrons' e g orbitals, and provides a mechanism for strong coupling between the electronic, magnetic and lattice degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

Thin–film trilayer manganate junctions

1998

Philosophical Transactions of the Royal Society of London. Seri

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Spin-dependent conductance across a manganate-barrier-manganate junction has recently been demonstrated. The junction is a La 0.67 Sr 0.33 MnO 3 -SrTiO 3 -La 0.67 Sr 0.33 MnO 3 trilayer device supporting current-perpendicular transport. Large magnetoresistance of up to a factor of five change was observed in these junctions at 4.2K in a relatively low field of the order of 100 Oe. Temperature and bias dependent studies revealed a complex junction interface structure whose materials physics has yet to be understood.

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Relationship Between Crystal Symmetry and Magnetic Properties of Ionic Compounds ContainingMn3+

Cited by 718 publications

References 50 publications

Phonon Raman scattering in LaMn1−xCoxO3 (x=0, 0.2, 0.3, 0.4, and 1.0)

Phonon Raman scattering in LaMn1−xCoxO3 (x=0, 0.2, 0.3, 0.4, and 1.0)

Irreversible effects in LaGa1−xMnxO3

Thin–film trilayer manganate junctions

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