Direct Observation of Charge and Orbital Ordering by Resonant X-ray Scattering

Murakami, Youichi; Hill, J. P.; Gibbs, Doon; Blume, M.; Kawada, H.; Koyama, I.; Tanaka, Masahiko; Kawata, Hiroshi; Arima, Takahiro; Moritomo, Y.; Tokura, Y.; Hirota, K.; Endoh, Y.

doi:10.7567/jjaps.38s1.360

Cited by 22 publications

(35 citation statements)

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“…LaMnO 3 the magnetic properties can be understood taking only the predominant JT distortion of the MnO 6 octahedra into account. The double degeneracy of the e g orbitals is lifted by a long-range cooperative Jahn-Teller distortion resulting in an ordering of the d 3r 2 −z 2 orbitals, as argued by Goodenough [48] and Solovyev et al [49] on the basis of theoretical considerations and recently confirmed experimentally by Murakami et al [50]. As a consequence of this JTdriven orbital ordering, the A-type AFM state is established below T N .…”

Section: Phase Diagrammentioning

confidence: 70%

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

Paraskevopoulos

Mayr

Hemberger

et al. 2000

J. Phys.: Condens. Matter

104

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We report that the 122 type Sr1−xCaxCo2P2 solid solution undergoes an anomalous structural transition from the uncollapsed to the collapsed ThCr2Si2 structure at a distinct onset composition near x = 0.5. Correlated with the structural changes, the electronic system evolves from a nearly ferromagnetic Fermi liquid to an antiferromagnetic metal, through a complex crossover regime. The structural collapse, driven by P-P bonding across the (Sr,Ca) layers, is much more pronounced in this system than it is in the analogous Fe-based system, indicating a strong sensitivity of structure to total electron count in the transition metal pnictide 122 family.

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Section: Phase Diagrammentioning

confidence: 70%

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

Paraskevopoulos

Mayr

Hemberger

et al. 2000

J. Phys.: Condens. Matter

104

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“…[25,36] There are many theoretical and experimental studies on the parent compounds, LaCrO 3 , LaMnO 3 , LaFeO 3 , LaCoO 3 , and LaNiO 3 and a range of interfacial and co-doping studies that provide insights into expected spin, charge, and oxygen-mediated coupling types between different 3d transition metal cations across a range of structural distortions and dimensionalities. [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61] These studies provide a starting point to understand nearest neighbor interactions and point to there being a wide range of different spin and exchange interactions coexisting in the high entropy systems; however these previous works provide no direct insights into how magnetism might evolve when combined in a randomly populated system where next nearest neighbors can vary widely.…”

Section: Resultsmentioning

confidence: 99%

Designing Magnetism in High Entropy Oxides

et al. 2022

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Disorder can have a dominating influence on correlated and quantum materials leading to novel behaviors which have no clean limit counterparts. In magnetic systems, spin and exchange disorder can provide access to quantum criticality, frustration, and spin dynamics, but broad tunability of these responses and a deeper understanding of strong limit disorder is lacking. In this work, we demonstrate that high entropy oxides present an unexplored route to designing quantum materials in which the presence of strong local compositional disorder hosted on a positionally ordered lattice can be used to generate highly tunable emergent magnetic behaviors-from macroscopically ordered states to frustration-driven dynamic spin interactions. Single crystal La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 films are used as a structurally uniform model system hosting a magnetic sublattice with massive microstate disorder in the form of site-to-site spin and exchange type inhomogeneity. A classical Heisenberg model is found to be sufficient to describe how compositionally disordered systems can paradoxically host long-range magnetic uniformity and demonstrates that balancing the populating elements based on their discrete quantum parameters can be used to give continuous control over ordering types and critical temperatures. Theory-guided experiments show that composite exchange values derived from the complex mix of microstate interactions can be used to design the required compositional parameters for a desired response. These predicted materials are synthesized and found to possess an incipient quantum critical point when magnetic ordering types are designed to be in direct competition; this leads to highly controllable exchange bias sensitivity in the monolithic single crystal films previously accessible only in intentionally designed bilayer heterojunctions.

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“…The crystal structure data thus provide an indirect signature of orbital ordering consistent with the A-type spin ordering. It should be noted that recently developed resonant X-ray scattering tools 66 have identified that the x 2 -y 2 orbital-ordered state is stable in the perovskite Nd 0.45 Sr 0.55 MnO 3 , a material that adopts the A-type magnetic structure. 67 Finally, since we know that for 0.8 < x e 1.0 anisotropic 3y 2r 2 orbitals are occupied, it is important to identify and to explore how the system crosses over to occupation of x 2 -y 2 orbitals, perhaps using probes of local structure (e.g., neutron pair distribution function analysis 30,68-70 ) or the above-mentioned resonant X-ray scattering probes.…”

Section: Evolution Of Structure With Dopingmentioning

confidence: 99%

Spin, Charge, and Lattice States in Layered Magnetoresistive Oxides

et al. 2001

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Colossal magnetoresistive materials are perovskite-related mixed-valent (Mn3+/Mn4+) manganese oxides that exhibit both spontaneous (at a Curie transition) and magnetic field-induced insulator−metal transitions. In concert with the dramatic changes in electrical conductivity, these oxides exhibit large lattice anomalies, ferro- and antiferromagnetism, charge ordering of the Mn3+/Mn4+ sites, etc. In this article, we discuss how a particular class of these manganite materials, naturally layered manganites La2 - 2 x Sr1+2 x Mn2O7, has allowed us to experimentally probe many of these tightly coupled phenomena. In particular, we examine the structure−property relationships that determine the critical magnetic ground states, we discuss how conductivity and its field dependence can test prevailing models for the magnetoresistance effect, and we explore the interplay and competition between charge- and magnetic-order on both long- and short range length scales. Finally, we present evidence from neutron and X-ray scattering that these short range charge correlations are essential to the mechanism of colossal magnetoresistance in naturally layered manganites.

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Direct Observation of Charge and Orbital Ordering by Resonant X-ray Scattering

Cited by 22 publications

References 0 publications

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

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

Designing Magnetism in High Entropy Oxides

Spin, Charge, and Lattice States in Layered Magnetoresistive Oxides

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Direct Observation of Charge and Orbital Ordering by Resonant X-ray Scattering

Cited by 22 publications

References 0 publications

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

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

Designing Magnetism in High Entropy Oxides

Spin, Charge, and Lattice States in Layered Magnetoresistive Oxides

Contact Info

Product

Resources

About

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

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