Magnetic properties and the phase diagram of La1-xSrxMnO3forx⩽0.2

Paraskevopoulos, M.; Mayr, F.; Hemberger, J.; Loidl, A.; Heichele, R.; Maurer, D.; Müller, V.; Mukhin, A. A.; Balbashov, A. M.

doi:10.1088/0953-8984/12/17/307

Cited by 103 publications

(101 citation statements)

References 71 publications

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“…La 1−x Sr x MnO 3 shows a variety of ground states, which depend strongly on the Sr concentration (x). 16,17 In particular, the ground state in x > 0.15 is identified as the ferromagnetic metallic phase with the centrosymmetric orthorhombic structure (space group: Pbnm). Note that magnetic easy axes in the ferromagnetic phase of La 1−x Sr x MnO 3 for x > 0.15 are parallel to the [111] direction in the high-temperature rhombohedral structure and, on the other hand, to the [001] direction in the low-temperature orthorhombic structure.…”

Section: Introductionmentioning

confidence: 99%

Observation of spin textures in La1−xSrxMnO3 (x = 0.175)

et al. 2016

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We have investigated topological spin textures in the ferromagnetic metallic phase of La0.825Sr0.175MnO3 with the centrosymmetric crystal structure by small-angle electron diffraction (SmAED) and low-temperature Lorentz transmission electron microscopy (TEM) experiments. In-situ Lorentz TEM and SmAED experiments revealed that type-I and type-II magnetic bubbles evolved from magnetic stripe domains with the Bloch-type domain wall by applying vertical magnetic field. Type-I magnetic bubbles with left-handed and right-handed spin helicity were randomly distributed and simultaneously type-II magnetic bubbles are formed locally. The important point about type-I and type-II magnetic bubbles is that their emergence depends strongly on whether perpendicular magnetic field is applied parallel to the magnetic easy axis along the [001] direction. Our experimental results suggested that the stabilization of magnetic bubbles should originate from the long-range dipole-dipole interactions, as opposed to the Dzyaloshinskii-Moriya interaction in helical magnets.

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Section: Introductionmentioning

confidence: 99%

Observation of spin textures in La1−xSrxMnO3 (x = 0.175)

et al. 2016

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“…We chose this concentration for the present study as an untwinned single crystal was available and T JT ∼605 K is accessible to our experimental setup [15].…”

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confidence: 99%

Orbital order parameter inLa0.95Sr0.05MnO3

Kochelaev¹,

Shilova²,

Balbashov³

et al. 2003

Phys. Rev. B

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The temperature dependence of the electron-spin resonance linewidth in La0.95Sr0.05MnO3 has been determined and analyzed in the paramagnetic regime across the orbital ordering transition. From the temperature dependence and the anisotropy of linewidth and g-value the orbital order can be unambiguously determined via the mixing angle of the wave functions of the eg-doublet. The linewidth shows a similar evolution with temperature as resonant x-ray scattering results.PACS numbers: 77.22. Gm, 64.70.Pf In transition-metal oxides the orbital degrees of freedom play an important role for the electric and magnetic properties. Their coupling to spin, charge and lattice is responsible for the occurrence of a variety of complex electronic ground states. Orbital order (OO) can be derived via the Jahn-Teller (JT) effect or via superexchange (SE) between degenerate orbitals under the control of strong Hund's-rule coupling [1]. Strong correlations exist between spin and orbital order and between OO and lattice distortions, but of course a one-to-one correspondence cannot be expected. While spin and lattice order can easily be detected experimentally, this is not true for OO and so far the OO parameter remains hidden. In recent years resonant x-ray scattering (RXS) has been used to derive information on the OO parameter [2], but there is an ongoing dispute, whether RXS probes the JT distortion or the orbital charge distribution [3,4]. Indirectly, OO can also be derived from diffraction experiments via lattice distortions and bond lengths [5]. In this Letter we demonstrate that electron-spin resonance (ESR) can be used to detect OO and to monitor the evolution of the OO parameter. Probing the spin of the partially filled d-shell of Mn 3+ ions by ESR, the anisotropy and T -dependence of g-value and linewidth ∆H provide clear information on OO via spin-orbit (SO) coupling.The power of ESR to gain insight into OO will be demonstrated on A-type antiferromagnetic (AFM) LaMnO 3 (T N =140 K), the parent compound of the magneto-resistance manganites and a paradigm for a cooperative JT effect that suggests a d 3x 2 −r 2 /d 3y 2 −r 2 -type OO below T N =750 K [6]. However, it has been shown that SE interactions play an important role, too [7]. Several recent studies exhibit clear anomalies of the ESR parameters at the JT transition in both doped and pure LaMnO 3 [8,9,10,11]. The orbitally ordered O ′ -phase is characterized by an anisotropy of ∆H [11,12], which for polycrystalline samples reduces to a broad maximum in ∆H(T ) [9,10]. Previously, the angular dependencies of ∆H and the resonance field H res had been analyzed for 200 K and 300 K in high-temperature approximation, allowing to estimate the Dzyaloshinsky-Moriya (DM) interaction and the strength of the zero-field splitting (ZFS) parameters [13]. At X-Band frequencies (9 GHz) ∆H was of the same order of magnitude as H res and due to the overlap with the resonance at −H res and their mutual coupling via the nondiagonal elements of the dynamic susceptibility [14] the values for ...

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“…Namely, while the negative-MR in the middle temperature In-regime (Fig.7) can be interpreted by the DEC inside of FMt grains, the positive-MR in the low temperature Mt-regime cannot be interpreted by this model. Note that sometimes positive-MR is found in the manganites, and is explained in terms of superexchange interaction [22], domain structures [23] and other models [24]. However, it is difficult to interpret all our results by a particular model.…”

Section: Fm Pmmentioning

confidence: 75%

Peculiar Electrical and Magnetic Properties of La(Ba)MnO3 Thin Films

Endo

Uehara

Yoshii

et al. 2010

Trans. Mat. Res. Soc. Japan

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In this article it is reviewed on enigmatic electrical and magnetic properties of La(Ba)MnO 3 thin films, useful for tunable microwave filters. As-grown films have well separated insulating to metallic (T p ) and paramagnetic to ferromagnetic (T c ) transition temperatures, which can be understood from the phase separation model. The film shows negative magnetoresistance (MR) caused by normal double exchange coupling effect, and positive MR which is interpreted by a magnetostriction effect. The phase separation is caused by crystal strain in the film. By annealing these two temperatures, T p and T c , become more separated, implying a size reduction of ferromagnetic grains. The phase separation scenario can be confirmed by ferromagnetic resonance (FMR) showing doublet signals. The FMR indicates anisotropic phase transition which supports the magnetostriction model. Moreover, the narrow FMR signals suggest high spin ordering and good crystallinity.

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Magnetic properties and the phase diagram of La_1-xSr_xMnO₃forx⩽0.2

Cited by 103 publications

References 71 publications

Observation of spin textures in La1−xSrxMnO3 (x = 0.175)

Observation of spin textures in La1−xSrxMnO3 (x = 0.175)

Orbital order parameter inLa0.95Sr0.05MnO3

Peculiar Electrical and Magnetic Properties of La(Ba)MnO<sub>3</sub> Thin Films

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