Spin-Glass Behavior and Magnetic Phase Diagram of La1-xSrxCoO3( 0 ≤x≤0.5) Studied by Magnetization Measurements

Itoh, Makoto; Natori, Ikuomi; Kubota, Satoshi; Motoya, Kiyoichiro

doi:10.1143/jpsj.63.1486

Cited by 441 publications

(349 citation statements)

References 22 publications

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“…LaCoO 3 shows a gradual non-magnetic to magnetic transition with temperature, which has been interpreted originally four decades ago as a gradual population of high spin (HS, t 4 2g e 2 g , S = 2) excited states starting from a low spin (LS, t 6 2g , S = 0) ground state [1,2,3,4,5,6,7,8]. This interpretation continued to be the starting point for experiments carried out up to roughly the first half of the 1990's [9,10,11,12]. All this changed with the theoretical work in 1996 by Korotin et al, who proposed on the basis of local density approximation + Hubbard U (LDA+U) band structure calculations, that the excited states are of the intermediate spin (IS, t 5 2g e 1 g , S = 1) type [13].…”

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confidence: 92%

“…This interpretation continued to be the starting point for experiments carried out up to roughly the first half of the 1990's [9,10,11,12]. All this changed with the theoretical work in 1996 by Korotin et al, who proposed on the basis of local density approximation + Hubbard U (LDA+U) band structure calculations, that the excited states are of the intermediate spin (IS, t 5 2g e 1 g , S = 1) type [13].…”

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confidence: 94%

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Spin State Transition inLaCoO3Studied Using Soft X-ray Absorption Spectroscopy and Magnetic Circular Dichroism

et al. 2006

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Using soft x-ray absorption spectroscopy and magnetic circular dichroism at the Co-L2,3 edge we reveal that the spin state transition in LaCoO3 can be well described by a low-spin ground state and a triply-degenerate high-spin first excited state. From the temperature dependence of the spectral lineshapes we find that LaCoO3 at finite temperatures is an inhomogeneous mixed-spinstate system. Crucial is that the magnetic circular dichroism signal in the paramagnetic state carries a large orbital momentum. This directly shows that the currently accepted low-/intermediate-spin picture is at variance. Parameters derived from these spectroscopies fully explain existing magnetic susceptibility, electron spin resonance and inelastic neutron data.PACS numbers: 71.28.+d, 71.70.Ch, 78.70.Dm LaCoO 3 shows a gradual non-magnetic to magnetic transition with temperature, which has been interpreted originally four decades ago as a gradual population of high spin (HS, t 4 2g e 2 g , S = 2) excited states starting from a low spin (LS, t 6 2g , S = 0) ground state [1,2,3,4,5,6,7,8]. This interpretation continued to be the starting point for experiments carried out up to roughly the first half of the 1990's [9,10,11,12]. All this changed with the theoretical work in 1996 by Korotin et al., who proposed on the basis of local density approximation + Hubbard U (LDA+U) band structure calculations, that the excited states are of the intermediate spin (IS, t 5 2g e 1 g , S = 1) type [13]. Since then many more studies have been carried out on LaCoO 3 with the majority of them [14,15,16,17,18,19,20,21,22,23,24,25,26,27] claiming to have proven the presence of this IS mechanism. In fact, this LDA+U work is so influential [28] that it forms the basis of most explanations for the fascinating properties of the recently synthesized layered cobaltate materials, which show giant magneto resistance as well as metal-insulator and ferroferri-antiferro-magnetic transitions with various forms of charge, orbital and spin ordering [29,30].In this paper we critically re-examine the spin state issue in LaCoO 3 . There has been several attempts made since 1996 in order to revive the LS-HS scenario [31,32,33,34,35], but these were overwhelmed by the above mentioned flurry of studies claiming the IS mechanism [14,15,16,17,18,19,20,21,22,23,24,25,26,27]. Moreover, a new investigation using inelastic neutron scattering (INS) has recently appeared in Phys. Rev. Lett.[36] making again the claim that the spin state transition involves the IS states. Here we used soft xray absorption spectroscopy (XAS) and magnetic circular dichroism (MCD) at the Co-L 2,3 edge and we revealed that the spin state transition in LaCoO 3 can be well described by a LS ground state and a triply degenerate HS excited state, and that an inhomogeneous mixed-spinstate system is formed. Parameters derived from these spectroscopies fully explain existing magnetic susceptibility and electron spin resonance (ESR) data, and provide support for an alternative interpretation of the INS [37]. C...

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Spin State Transition inLaCoO3Studied Using Soft X-ray Absorption Spectroscopy and Magnetic Circular Dichroism

et al. 2006

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“…Values of a few per cent are typical and reflect a substantial strain response, because the corresponding strain level is of the order of 0.1%. The data in figure 2a are recorded in a constant magnetic field of 100 mT that is sufficient to saturate the magnetization in the ferromagnetic film above T = 50 K. We note that bulk La 0.7 Sr 0.3 CoO 3 is a cluster glass [25] with imperfect ferromagnetic order. The small amount of magnetic disorder prevailing in the 'ferromagnetic phase' is not seen in films, probably owing to the small relative volume.…”

Section: Results and Discussion (A) Static And Reversible Strain Applmentioning

confidence: 96%

“…We conclude that, at a tensile strain level of approximately 1%, SrRuO 3 is tetragonal, and biaxial elastic strain seems to distort the oxygen octahedra, leading to an efficient suppression of the ordered magnetic moment. spin states [29] that grow in number and size with increasing x, thereby forming a spin glass phase below the phase boundary of x = 0.18 where percolation and long-range ordering of the ferromagnetic phase occur [25]. We selected the composition of x = 0.2 close to the phase boundary in an attempt to drive the transition by elastic strain.…”

Section: (C) Strain-dependent Magnetic Moment Of Srruomentioning

confidence: 99%

Strain response of magnetic order in perovskite-type oxide films

Herklotz

Biegalski

Christen

et al. 2014

Phil. Trans. R. Soc. A.

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The role of elastic strain for magnetoelectric materials and devices is twofold. It can induce ferroic orders in thin films of otherwise non-ferroic materials. On the other hand, it provides the most exploited coupling mechanism in two-phase magnetoelectric materials and devices today. Complex oxide films (perovskites, spinels) are promising for both routes. The strain control of magnetic order in complex oxide films is a young research field, and few ab initio simulations are available for magnetic order in dependence on lattice parameters and lattice symmetry. Here, an experimental approach for the evaluation of how elastic strain in thin epitaxial films alters their magnetic order is introduced. The magnetic films are grown epitaxially in strain states controlled by buffer layers onto piezoelectric substrates of 0.72Pb(Mg 1/3 Nb 2/3 )O 3 –0.28PbTiO 3 (001). As an example, the strain dependence of the ordered magnetic moment of SrRuO 3 has been investigated. At a tensile strain level of approximately 1%, SrRuO 3 is tetragonal, and biaxial elastic strain induces a pronounced suppression of the ordered magnetic moment. As a second example, a strain-driven transition from a ferromagnetic to a magnetically disordered phase has been observed in epitaxial La 0.8 Sr 0.2 CoO 3 films.

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“…It has also been more or less established that the ferromagnetic ordering for x 0.18 is the result of double exchange interaction between the t g spins of Co 3+ and Co 4+ in either their intermediate spin [8,9] or low spin states [10]. A higher T C of around 300 K was later reported in cobalt oxide RBaCo 2 O 5.5 (R = rare earth element) [3,11], where only Co 3+ was found in the compound, implying the irrelevance of the conventional double exchange interaction for the appearance of ferromagnetic ordering.…”

Section: Introductionmentioning

confidence: 99%

Effects of partial Co replacement by Fe in Sr_0.775Y_0.225CoO_3-δ on its magnetic property, oxygen deficiency and crystal structure

Sutjahja

Berthalita

Mustaqima

et al. 2015

Materials Science-Poland

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A study has been conducted on the effects of partial, 10 % Co substitution by Fe in the perovskite Sr0.775Y0.225CoO3-δ compound. The XRD data show that the resulted samples of Fe-free and Fe-doped compounds exhibit good 314 single phase quality with a tetragonal I4/mmm crystal structure. The measured M-T curves display the typical feature of ferromagnetic (FM) transition at 335 K for the Fe-free sample, while showing significantly degraded FM ordering for the 10 % Fe-doped sample. The oxygen deficiency determined fro|m our 10 % Fe doped sample is found to decrease by only 0.025. Further detailed analysis of the XRD data also reveals distinctly different structural changes in the Co-O slabs compared to the 50 % Fe-doped sample which exhibits a complete suppression of FM order. The results of this study, thus, have revealed the close relations among the changes induced by Fe doping in the magnetic ordering of crystal, and its oxygen content as well as the associated local structure in the Co-O layers responsible for the magnetic properties in the compound.

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Spin-Glass Behavior and Magnetic Phase Diagram of La_1-xSr_xCoO₃( 0 ≤x≤0.5) Studied by Magnetization Measurements

Cited by 441 publications

References 22 publications

Spin State Transition inLaCoO3Studied Using Soft X-ray Absorption Spectroscopy and Magnetic Circular Dichroism

Spin State Transition inLaCoO3Studied Using Soft X-ray Absorption Spectroscopy and Magnetic Circular Dichroism

Strain response of magnetic order in perovskite-type oxide films

Effects of partial Co replacement by Fe in Sr_0.775Y_0.225CoO_3-δ on its magnetic property, oxygen deficiency and crystal structure

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Spin-Glass Behavior and Magnetic Phase Diagram of La1-xSrxCoO3( 0 ≤x≤0.5) Studied by Magnetization Measurements

Cited by 441 publications

References 22 publications

Spin State Transition inLaCoO3Studied Using Soft X-ray Absorption Spectroscopy and Magnetic Circular Dichroism

Spin State Transition inLaCoO3Studied Using Soft X-ray Absorption Spectroscopy and Magnetic Circular Dichroism

Strain response of magnetic order in perovskite-type oxide films

Effects of partial Co replacement by Fe in Sr0.775Y0.225CoO3-δ on its magnetic property, oxygen deficiency and crystal structure

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Spin-Glass Behavior and Magnetic Phase Diagram of La_1-xSr_xCoO₃( 0 ≤x≤0.5) Studied by Magnetization Measurements

Effects of partial Co replacement by Fe in Sr_0.775Y_0.225CoO_3-δ on its magnetic property, oxygen deficiency and crystal structure