Nanotextured phase coexistence in the correlated insulator V2O3

McLeod, Alexander; Heumen, E. van; Ramírez, Juan Gabriel; Wang, S.; Saerbeck, Thomas; Guénon, Stefan; Goldflam, Michael; Anderegg, Loïc; Kelly, P.; Mueller, A.; Liu, M. K.; Schuller, Iván K.; Basov, D. N.

doi:10.1038/nphys3882

Cited by 198 publications

(127 citation statements)

References 48 publications

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“…Further, it is important to understand the nature of the boundary between the phases where competing orders may stabilize new phases or enable new properties, as seen in the paramagnetic metal to AFM insulator transition in V 2 O 3 . An intermediate electronic state is observed that is linked to the strain accommodation from coexistent structural phases [69]. Understanding such complex phase behaviour will require close coupling of synthesis, including studying mesoscale structures, theory and characterization of materials at the appropriate spatial and temporal scales.…”

Section: First-order Magnetic Phase Transitions and Nanoscale Phase Cmentioning

confidence: 99%

“…The phase transition proceeds by phase separation into coexisting and fluctuating metallic and insulating domains [66]. Such complex behaviour is ubiquitous in transition-metal oxides [60,[67][68][69], which often transition from an isotropic metallic FM state to an insulating AFM state upon charge and orbital ordering.…”

Section: First-order Magnetic Phase Transitions and Nanoscale Phase Cmentioning

confidence: 99%

“…Understanding such complex phase behaviour will require close coupling of synthesis, including studying mesoscale structures, theory and characterization of materials at the appropriate spatial and temporal scales. There are numerous examples where the phase separation is intrinsic to the system [60,[66][67][68][69], spontaneously appearing as a result of competing interactions and can be a dynamic precursor of the phase transition. A current and future challenge is to understand the nature of the phase separation, both spatially and temporally, and the degree to which the phase separation is linked or possibly controlled by local structural variations (i.e.…”

Section: First-order Magnetic Phase Transitions and Nanoscale Phase Cmentioning

confidence: 99%

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The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

326

207

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Building upon the success and relevance of the 2014 Magnetism Roadmap, this 2017 Magnetism Roadmap edition follows a similar general layout, even if its focus is naturally shifted, and a different group of experts and, thus, viewpoints are being collected and presented. More importantly, key developments have changed the research landscape in very relevant ways, so that a novel view onto some of the most crucial developments is warranted, and thus, this 2017 Magnetism Roadmap article is a timely endeavour. The change in landscape is hereby not exclusively scientific, but also reflects the magnetism related industrial application portfolio. Specifically, Hard Disk Drive technology, which still dominates digital storage and will continue to do so for many years, if not decades, has now limited its footprint in the scientific Topical ReviewOriginal content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. and research community, whereas significantly growing interest in magnetism and magnetic materials in relation to energy applications is noticeable, and other technological fields are emerging as well. Also, more and more work is occurring in which complex topologies of magnetically ordered states are being explored, hereby aiming at a technological utilization of the very theoretical concepts that were recognised by the 2016 Nobel Prize in Physics.Given this somewhat shifted scenario, it seemed appropriate to select topics for this Roadmap article that represent the three core pillars of magnetism, namely magnetic materials, magnetic phenomena and associated characterization techniques, as well as applications of magnetism. While many of the contributions in this Roadmap have clearly overlapping relevance in all three fields, their relative focus is mostly associated to one of the three pillars. In this way, the interconnecting roles of having suitable magnetic materials, understanding (and being able to characterize) the underlying physics of their behaviour and utilizing them for applications and devices is well illustrated, thus giving an accurate snapshot of the world of magnetism in 2017.The article consists of 14 sections, each written by an expert in the field and addressing a specific subject on two pages. Evidently, the depth at which each contribution can describe the subject matter is limited and a full review of their statuses, advances, challenges and perspectives cannot be fully accomplished. Also, magnetism, as a vibrant research field, is too diverse, so that a number of areas will not be adequately represented here, leaving space for further Roadmap editions in the future. However, this 2017 Magnetism Roadmap article can provide a frame that will enable the reader to judge where each subject and magnetism research field stands overall today and which directions it might take in the foreseeable future.The first mater...

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Section: First-order Magnetic Phase Transitions and Nanoscale Phase Cmentioning

confidence: 99%

Section: First-order Magnetic Phase Transitions and Nanoscale Phase Cmentioning

confidence: 99%

Section: First-order Magnetic Phase Transitions and Nanoscale Phase Cmentioning

confidence: 99%

See 1 more Smart Citation

The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

326

207

View full text Add to dashboard Cite

show abstract

“…10, respectively. Metallic regions where the dc conductivity is high and the real part of the dielectric function is negative at the probing energy yield high nano-IR signals [46]. The red color represents metallic domains and dark blue represents insulating domains.…”

Section: Afm and Near-field Optical Microscopymentioning

confidence: 99%

Mott transition and collective charge pinning in electron doped Sr2IrO4

et al. 2018

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We studied the in-plane dynamic and static charge conductivity of electron doped Sr 2 IrO 4 using optical spectroscopy and DC transport measurements. The optical conductivity indicates that the pristine material is an indirect semiconductor with a direct Mott gap of 0.55 eV. Upon substitution of 2% La per formula unit the Mott gap is suppressed except in a small fraction of the material (15%) where the gap survives, and overall the material remains insulating. Instead of a zero energy mode (or Drude peak) we observe a soft collective mode (SCM) with a broad maximum at 40 meV. Doping to 10% increases the strength of the SCM, and a zero-energy mode occurs together with metallic DC conductivity. Further increase of the La substitution doesn't change the spectral weight integral up to 3 eV. It does however result in a transfer of the SCM spectral weight to the zero-energy mode, with a corresponding reduction of the DC resistivity for all temperatures from 4 to 300 K. The presence of a zero-energy mode signals that at least part of the Fermi surface remains ungapped at low temperatures, whereas the SCM appears to be caused by pinning a collective frozen state involving part of the doped electrons.

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“…It provides for nano-imaging and -spectroscopy down to few nanometer length scales, gaining insight into molecular orientation [5] and coupling [6], catalytic activity [7], heterogeneity in electron and lattice dynamics [8,9], and plasmonic and polaritonic effects in quantum matter [10][11][12][13] with recent extension to the low temperature [9,14] and ultrafast regimes [15][16][17][18]. Despite these significant developments, s-SNOM has largely been limited to a narrow range of the electromagnetic spectrum of the near-to mid-IR at high frequencies, and the RF [19] and low THz [20] regime at low frequencies.…”

mentioning

confidence: 99%

Far Infrared Synchrotron Near-Field Nanoimaging and Nanospectroscopy

et al. 2018

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Scattering scanning near-field optical microscopy (s-SNOM) has emerged as a powerful imaging and spectroscopic tool for investigating nanoscale heterogeneities in biology, quantum matter, and electronic and photonic devices. However, many materials are defined by a wide range of fundamental molecular and quantum states at far-infrared (FIR) resonant frequencies currently not accessible by s-SNOM. Here we show ultrabroadband FIR s-SNOM nanoimaging and spectroscopy by combining synchrotron infrared radiation with a novel fast and low-noise copper-doped germanium (Ge:Cu) photoconductive detector. This approach of FIR synchrotron infrared nanospectroscopy (SINS) extends the wavelength range of s-SNOM to 31 μm (320 cm −1 , 9.7 THz), exceeding conventional limits by an octave to lower energies. We demonstrate this new nanospectroscopic window by measuring elementary excitations of exemplary functional materials, including surface phonon polariton waves and optical phonons in oxides and layered ultrathin van der Waals materials, skeletal and conformational vibrations in molecular systems, and the highly tunable plasmonic response of graphene.

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Nanotextured phase coexistence in the correlated insulator V2O3

Cited by 198 publications

References 48 publications

The 2017 Magnetism Roadmap

The 2017 Magnetism Roadmap

Mott transition and collective charge pinning in electron doped Sr2IrO4

Far Infrared Synchrotron Near-Field Nanoimaging and Nanospectroscopy

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