Interplay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi><mml:mtext>−</mml:mtext><mml:mi>d</mml:mi></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi><mml:mtext>−</mml:mtext><mml:mi>d</mml:mi></mml:mrow></mml:math>charge transfer transitions in rare-earth perovskite manganites

Moskvin, A. S.; Махнев, А. А.; Nomerovannaya, L. V.; Loshkareva, N. N.; Balbashov, A. M.

doi:10.1103/physrevb.82.035106

Cited by 88 publications

(59 citation statements)

References 59 publications

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“…In general the manganites show two prominent, broad features in the imaginary part of the dielectric function in the ultraviolet to near infrared spectral range [21,22]. At higher energies there is a strong increase typically attributed to charge transfer transitions from O 2p Mn 3d levels, creating locally an Mn 2+ excited state.…”

Section: Discussionmentioning

confidence: 99%

Magnetic order dynamics in optically excited multiferroicTbMnO3

Johnson¹,

Kubacka²,

Hoffmann³

et al. 2015

Phys. Rev. B

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We performed ultrafast time-resolved near-infrared pump, resonant soft X-ray diffraction probe measurements to investigate the coupling between the photoexcited electronic system and the spin cycloid magnetic order in multiferroic TbMnO3 at low temperatures. We observe melting of the long range antiferromagnetic order at low excitation fluences with a decay time constant of 22.3 ± 1.1 ps, which is much slower than the ~1 ps melting times previously observed in other systems. To explain the data we propose a simple model of the melting process where the pump laser pulse directly excites the electronic system, which then leads to an increase in the effective temperature of the spin system via a slower relaxation mechanism. Despite this apparent increase in the effective spin temperature, we do not observe changes in the wavevector q of the antiferromagnetic spin order that would typically correlate with an increase in temperature under equilibrium conditions. We suggest that this behavior results from the extremely low magnon group velocity that hinders a change in the spin-spiral wavevector on these time scales.2

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Section: Discussionmentioning

confidence: 99%

Magnetic order dynamics in optically excited multiferroicTbMnO3

Johnson¹,

Kubacka²,

Hoffmann³

et al. 2015

Phys. Rev. B

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“…The observed weak angular dependence of the measured ellipsometry spectra did not allow us to decouple the in-plane and out-of-plane components of the complex dielectric function: ( ) 24 and hexagonal 25 manganites along with photo emission and X-ray absorption data 26,27 show that closest to the Fermi level are Mn(3d)…”

Section: B Optical Properties Measured By Spectroscopic Ellipsometrymentioning

confidence: 99%

Optical properties, lattice dynamics, and structural phase transition in hexagonal2H−BaMnO3single crystals

Stanislavchuk

Litvinchuk

et al. 2015

Phys. Rev. B

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Optical properties and lattice dynamics of hexagonal 2H-BaMnO 3 single crystals are studied experimentally in a wide temperature range by means of rotating analyzer ellipsometry and Raman scattering. The magnitude of the direct electronic band gap is found to be E g = 3.2 eV. At room temperature the far-infrared (IR) ellipsometry spectra reveal six IR-active phonons, two of them are polarized along the c-axis and four are polarized within the a−b plane. Seven phonon modes are identified in the Raman scattering experiments. Group theoretical mode analysis and complimentary density functional theory lattice dynamics calculations are consistent with the 2H-BaMnO 3 structure belonging to the polar P6 3 mc space group at room temperature. All observed vibrational modes are assigned to the specific eigenmodes of the lattice. The neutron diffraction measurements reveal a structural phase transition upon cooling below T C =130±5 K, which is accompanied by the lattice symmetry change from the P6 3 mc to the P6 3 cm. Simultaneously, at temperatures below T C several additional IR-and Raman-active modes are detected in experimental spectra. This confirms the occurrence of a structural transition, which is possibly associated with appearance of the electrical polarization along the c-axis and a previously known tripling of the primitive cell volume at low temperatures. PACS number(s): 63.20.dh, 75.47.Lx, 75.85.+t

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“…The origin of the peak structure is not completely understood. 32,33 However, for a more comprehensive understanding of the origin of the small peak structure, it should be noted that these small peaks appear also in the doped single interfacial MnO 2 layer lying between a SrO layer and LaO layer.…”

Section: E Dimensional Effect In Lamno 3 /Srtio 3 Superlatticesmentioning

confidence: 99%

Charge states and magnetic ordering in LaMnO3/SrTiO3superlattices

et al. 2011

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We investigated the magnetic and optical properties of [(LaMnO 3 ) n /(SrTiO 3 ) 8 ] 20 (n = 1, 2, and 8) superlattices grown by pulsed laser deposition. We found a weak ferromagnetic and semiconducting state developed in all superlattices. An analysis of the optical conductivity showed that the LaMnO 3 layers in the superlattices were slightly doped. The amount of doping was almost identical regardless of the LaMnO 3 layer thickness up to eight unit cells, suggesting that the effect is not limited to the interface. On the other hand, the magnetic ordering became less stable as the LaMnO 3 layer thickness decreased, probably due to a dimensional effect.

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Interplay ofp−dandd−dcharge transfer transitions in rare-earth perovskite manganites

Cited by 88 publications

References 59 publications

Magnetic order dynamics in optically excited multiferroicTbMnO3

Magnetic order dynamics in optically excited multiferroicTbMnO3

Optical properties, lattice dynamics, and structural phase transition in hexagonal2H−BaMnO3single crystals

Charge states and magnetic ordering in LaMnO3/SrTiO3superlattices

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