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Lengsdorf, R.; Ait-Tahar, M.; Saxena, Saumya; Ellerby, M.; Khomskii, D. I.; Micklitz, H.; Lorenz, T.; Abd-Elmeguid, M. M.

doi:10.1103/physrevb.69.140403

Cited by 97 publications

(55 citation statements)

References 27 publications

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“…Besides the magnetic behavior as mentioned above, another notable feature of cobaltite systems, which has also attracted interest, is the spin-state transition as a function of temperature and pressure t e ; S = 2) configurations often occur under the action of thermal excitation energy and pressure [4,5]. In the case of hole-doped cobaltites, R 1-x A′ x CoO 3 , the complexity of the system is further increased due to the additional presence of Co 4+ ions which are also able to exist in three spin-state configurations (LS, IS, and HS) [15].…”

Section: +mentioning

confidence: 99%

ESR study of Sr‐doped LaCoO₃ cobaltites

Phan

Bau

Khiem

et al. 2005

Physica Status Solidi (b)

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PACS 71.38.Ht, 76.30.Kg The electron spin resonance (ESR) method was used to investigate the internal spin dynamics of La 1-x Sr x CoO 3 (x = 0.1, 0.2, 0.3) compounds in the temperature range 170 to ~500 K. ESR spectra of the samples over the whole temperature range studied could be divided into three regions corresponding to different linewidths. This is due to the presence of an anisotropic field arising from ferromagnetic clusters. This is similar to manganite perovskites. The peak-to-peak ESR linewidth vs. temperature, ∆H pp (T), for the samples has a minimum value at a temperature T min (in this case T min ≈ 1.7T C , whereas T min ≈ 1.1T C for manganites). Asymmetric Lorentzian ESR spectra at temperatures T < T min become Gaussian at T > T min . ESR signals of La 1-x Sr x CoO 3 cobaltites are thermally damped out at ~460 K, this value being much lower than that for manganite compounds. The explanation of the experimental ∆H pp (T) data in the T > T min regime is based on the one-phonon process and adiabatic hopping motion of small polarons.

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Section: +mentioning

confidence: 99%

ESR study of Sr‐doped LaCoO₃ cobaltites

Phan

Bau

Khiem

et al. 2005

Physica Status Solidi (b)

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“…Even a strain-induced transition from a magnetically ordered/electrically conducting to a nonmagnetic/insulating state is possible by changing the spin state of the magnetic ions. 83 Since previous experiments showed that changes of the magnetic anisotropy are the driving force behind the converse magnetoelectric effects in Fe 3 O 4 /BTO hybrids, 63 we neglect any strain-induced modification of the saturation magnetization M s and assume M s to be homogeneous throughout the Fe 3 O 4 thin film. In this approximation, the magnetization values M c and M a are described by M c = M s m c and M a = M s m a , respectively.…”

Section: Magnetoelastic Effectsmentioning

confidence: 99%

Converse magnetoelectric effects in Fe3O4/BaTiO3multiferroic hybrids

et al. 2013

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The quantitative understanding of converse magnetoelectric effects, i.e., the variation of the magnetization as a function of an applied electric field, in extrinsic multiferroic hybrids is a key prerequisite for the development of future spintronic devices. We present a detailed study of the strain-mediated converse magnetoelectric effect in ferrimagnetic Fe3O4 thin films on ferroelectric BaTiO3 substrates at room temperature. The experimental results are in excellent agreement with numerical simulation based on a two-region model. This demonstrates that the electric field induced changes of the magnetic state in the Fe3O4 thin film can be well described by the presence of two different ferroelastic domains in the BaTiO3 substrate, resulting in two differently strained regions in the Fe3O4 film with different magnetic properties. The two-region model allows to predict the converse magnetoelectric effects in multiferroic hybrid structures consisting of ferromagnetic thin films on ferroelastic substrates.

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“…The rare-earth cobaltite LaCoO 3 exhibit unusual magnetic and electronic phase transitions, which can be tuned by changing the temperature, pressure [1][2][3][4][5][6] as well as with chemical substitutions at the La/Co site [7][8][9][10][11][12][13][14][15][16]. The 3d orbitals of the Co 3+ ion, surrounded with octahedrally coordinated O 2− ions, are split into the t 2g (triply degenerate) and the e g (doubly degenerate) orbitals in the lower and upper energy levels, respectively.…”

Section: Introductionmentioning

confidence: 99%

Anomalous magnetic and spin glass behavior in Nb-substituted LaCo1−xNbxO3

Shukla

Dhaka

2018

Phys. Rev. B

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We report the structural, magnetic, transport and electronic properties of Nb substituted LaCo1−xNbxO3 (x = 0-0.2). The Rietveld analysis of x-ray diffraction data demonstrate structural phase transitions from rhombohedral to orthorhombic and further to monoclinic with increasing the Nb concentration up to x ≥ 0.2. Interestingly, we observed dramatic changes in the magnetization (M) with increasing the Nb concentration, as the M sharply increases below 10 K even at 2.5% substitution. Furthermore, ac susceptibility data show the spin-glass behavior in x = 0.1 sample. We find that the density of states near the Fermi level decreases and the activation energy increases, which results in the decreasing conductivity with higher Nb concentration. A significant shift in the peak position of A2g phonon mode has been observed using Raman spectroscopy, which indicates the change in the coupling due to the structural distortion with Nb substitution. The core-level photoemission study confirms that the Nb is present in 5+ valence state. Our study reveals that the nonmagnetic Nb 5+ (d 0 ) substitution converts Co 3+ ions to Co 2+ and stabilize both in the high-spin state. Our results suggest that structural and spin-state transitions as well as the difference in the ionic radii between Nb 5+ and Co 3+ are playing an important role in tuning the physical properties.

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Pressure-induced insulating state in(La,Sr)CoO3

Cited by 97 publications

References 27 publications

ESR study of Sr‐doped LaCoO₃ cobaltites

ESR study of Sr‐doped LaCoO₃ cobaltites

Converse magnetoelectric effects in Fe3O4/BaTiO3multiferroic hybrids

Anomalous magnetic and spin glass behavior in Nb-substituted LaCo1−xNbxO3

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Pressure-induced insulating state in(La,Sr)CoO3

Cited by 97 publications

References 27 publications

ESR study of Sr‐doped LaCoO3 cobaltites

ESR study of Sr‐doped LaCoO3 cobaltites

Converse magnetoelectric effects in Fe3O4/BaTiO3multiferroic hybrids

Anomalous magnetic and spin glass behavior in Nb-substituted LaCo1−xNbxO3

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ESR study of Sr‐doped LaCoO₃ cobaltites

ESR study of Sr‐doped LaCoO₃ cobaltites