Role of complex energy landscapes and strains in multiscale inhomogeneities in perovskite manganites

Ahn, K. H.; Seman, Tsezar F.; Lookman, Turab; Bishop, A. R.

doi:10.1103/physrevb.88.144415

Cited by 22 publications

(17 citation statements)

References 63 publications

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“…To date, the phase coexistence and inhomogeneities in manganites have been firmly established and are believed to be due to the similarity of the free energy scales of different phases. However, on account of defects or strain, the phase separation cannot be simply explained by local and global energy minima as addressed in numerical simulations [190,292]. The effects of short-and long-range lattice distortion must be considered as well.…”

Section: Phase Separation and Nano-imaging In Manganitesmentioning

confidence: 99%

Nanoscale electrodynamics of strongly correlated quantum materials

2016

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Electronic, magnetic, and structural phase inhomogeneities are ubiquitous in strongly correlated quantum materials. The characteristic length scales of the phase inhomogeneities can range from atomic to mesoscopic, depending on their microscopic origins as well as various sample dependent factors. Therefore, progress with the understanding of correlated phenomena critically depends on the experimental techniques suitable to provide appropriate spatial resolution. This requirement is difficult to meet for some of the most informative methods in condensed matter physics, including infrared and optical spectroscopy. Yet, recent developments in near-field optics and imaging enabled a detailed characterization of the electromagnetic response with a spatial resolution down to 10 nm. Thus it is now feasible to exploit at the nanoscale well-established capabilities of optical methods for characterization of electronic processes and lattice dynamics in diverse classes of correlated quantum systems. This review offers a concise description of the state-of-the-art near-field techniques applied to prototypical correlated quantum materials. We also discuss complementary microscopic and spectroscopic methods which reveal important mesoscopic dynamics of quantum materials at different energy scales.

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Section: Phase Separation and Nano-imaging In Manganitesmentioning

confidence: 99%

Nanoscale electrodynamics of strongly correlated quantum materials

2016

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“…1 Significant consequences of this near degeneracy include the coexistence of phases and/or the 'colossal' tunability of physical properties in response to external perturbations such as magnetic field and pressure. [2][3][4][5][6] Examples of such tunable properties include multiferroic behavior, 7 colossal magnetoresistance, 8 magnetically tuned shape-memory effects, 9,10 and magnetothermal and magnetodielectric behavior. [11][12][13] Clarifying the mechanisms connecting nearly degenerate phases and tunable behavior in specific materials has been one of the key challenges of condensed matter physics in recent years.…”

Section: Introductionmentioning

confidence: 99%

Effects of magnetic field and twin domains on magnetostructural phase mixture inMn3O4: Raman scattering studies of untwinned crystals

et al. 2016

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The ferrimagnetic spinel Mn3O4 exhibits large and anisotropic changes in electronic and structural properties in response to an applied magnetic field. These changes are thought to result from the field-dependent tuning-via strong spin-lattice coupling-between two nearly degenerate magnetostructural phases. Recent variable-magnetic-field studies of Mn3O4 have been performed on melt-grown crystals, which can exhibit twin domains due to a Jahn-Teller structural transition below the melting temperature. Because of the near degeneracy of the magnetostructural phases, however, strain associated with the twin domains likely affects the magnetic responses of Mn3O4. In this report, we present a variable-magnetic-field Raman scattering study of untwinned Mn3O4 crystals grown out of a flux below the Jahn-Teller structural transition. We measure distinct q = 0 magnetic and vibrational excitation spectra for each isolated magnetostructural phase of untwinned Mn3O4 crystals and determine the symmetries of the observed excitations. We determine how the magnetostructural phase mixture changes in response to magnetic fields applied in the magnetic easy plane. Lastly, by comparing results on flux-and melt-grown Mn3O4 crystals, we show that the intrinsic mixture of the two magnetostructural phases is indeed strongly influenced by the presence of twin domains.

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“…Energy landscape concepts in martensites are used in other contexts [27][28][29][30][31][32] . In perovskite manganites, the straininduced metal-insulator phase coexistence is understood through an elastic energy landscape 27 . In a binary alloy system, the crystallization of strain glass and it's properties are studied using frustrated free-energy landscape 28 .…”

Section: Energy Landscape Conceptsmentioning

confidence: 99%

Golf-course and funnel energy landscapes: Protein folding concepts in martensites

Shankaraiah

2017

Phys. Rev. E

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We use protein folding energy landscape concepts such as golf-course and funnel to study reequilibration in athermal martensite parameter regime of triangle-to-centered rectangle, squareto-oblique, and triangle-to-oblique transitions under systematic temperature-quench Monte Carlo simulations. On quenching below a transition temperature, the seeded high-symmetry parent-phase austenite that converts to the low-symmetry product-phase martensite, through autocatalytic twinning or elastic photocopying, has both rapid conversions and incubation-delays in the temperaturetime-transformation phase diagram. We find the rapid (incubation-delays) conversions at low (high) temperatures arises from the presence of large (small) size of golf-course edge that has funnel inside for negative energy states. In the incubating state, the strain structure factor enters into the Brillouin zone golf-course through searches for finite transitional pathways which closes off at the transition temperature with Vogel-Fulcher divergences that are insensitive to Hamiltonian energy scales and log-normal distributions, as signatures of dominant entropy barriers. The crossing of the entropy barrier is identified through energy occupancy distributions, Monte Carlo acceptance fractions, heat emission and internal work. The above ideas had previously been presented for the scalar order parameter case. Here we show similar results are also obtained for vector order parameters.

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Role of complex energy landscapes and strains in multiscale inhomogeneities in perovskite manganites

Cited by 22 publications

References 63 publications

Nanoscale electrodynamics of strongly correlated quantum materials

Nanoscale electrodynamics of strongly correlated quantum materials

Effects of magnetic field and twin domains on magnetostructural phase mixture inMn3O4: Raman scattering studies of untwinned crystals

Golf-course and funnel energy landscapes: Protein folding concepts in martensites

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