Frustrated Magnetism in Mott Insulating 
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Leiner, J. C.; Jeschke, Harald O.; Valentí, Roser; Zhang, S.; Savici, A. T.; Lin, Jiao; Stone, M. B.; Lumsden, M. D.; Hong, Jiawang; Delaire, Olivier; Bao, Wan-Su; Broholm, C.

doi:10.1103/physrevx.9.011035

Cited by 17 publications

(18 citation statements)

References 92 publications

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“…4. This prediction has got further support by recent inelastic neutron scattering data combined with DFT calculations 52 . All the above results suggest that the corundum phase of pure V 2 O 3 is intrinsically unstable, and destined to turn into a monoclinic phase at low temperature.…”

Section: Multiscale Modellingsupporting

confidence: 64%

“…All the above results suggest that the corundum phase of pure V 2 O 3 is intrinsically unstable, and destined to turn into a monoclinic phase at low temperature. The fact that such transition happens to coincide with a metal to an antiferromagnetic insulator transition indicates just a strong positive interplay between the lattice instability and the electronic correlations 47,48,52 . However, nothing would prevent the structural and the metal-insulator transitions to occur separately.…”

Section: Multiscale Modellingmentioning

confidence: 99%

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Nanoscale self-organisation in Mott insulators: a richness in disguise

Ronchi

Franceschini

Poli

et al. 2021

Preprint

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Mott transitions in real materials are first order and almost always associated with lattice distortions, both features promoting the emergence of nanotextured phases. This nanoscale self-organization creates spatially inhomogeneous regions, which can host and protect transient non-thermal electronic and lattice states triggered by light excitation. However, to gain full control of the Mott transition for potential applications in the field of ultrafast switching and neuromorphic computing it is necessary to develop novel spatial and temporal multiscale experimental probes as well as theoretical approaches able to distill the complex microscopic physics into a coarse-grained modelling. Here, we combine time-resolved X-ray microscopy, which snaps phase transformations on picosecond timescales with nanometric resolution, with a Landau-Ginzburg functional approach for calculating the strain and electronic real-space configurations. We investigate V2O3, the archetypal Mott insulator in which nanoscale self-organization already exists in the low-temperature monoclinic phase and strongly affects the transition towards the high-temperature corundum metallic phase. Our joint experimental-theoretical approach uncovers a remarkable out-of-equilibrium phenomenon: the photoinduced stabilisation of the long sought monoclinic metal phase, which is absent at equilibrium and in homogeneous materials, but emerges as a metastable state solely when light excitation is combined with the underlying nanotexture of the monoclinic lattice. Our results provide full comprehension of the nanotexture dynamics across the insulator-to-metal transition, which can be readily extended to many families of Mott insulating materials. The combination of ultrafast light excitation and spatial nanotexture turns out to be key to develop novel control protocols in correlated quantum materials.

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Section: Multiscale Modellingsupporting

confidence: 64%

Section: Multiscale Modellingmentioning

confidence: 99%

Nanoscale self-organisation in Mott insulators: a richness in disguise

Ronchi

Franceschini

Poli

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…1(b) shows the temperature dependence of the MR, as measured relative to 9 T: MR = [ρ(9 T) − ρ(0)]/ρ(0). This field is far smaller than the exchange interaction [19]. The inset of Fig.…”

Section: Resultsmentioning

confidence: 88%

Magnetic field frustration of the metal-insulator transition in V2O3

et al. 2020

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Despite decades of efforts, the origin of metal-insulator transitions (MITs) in strongly correlated materials remains one of the main long-standing problems in condensed-matter physics. An archetypal example is V 2 O 3 , which undergoes simultaneous electronic, structural, and magnetic phase transitions. This remarkable feature highlights the many degrees of freedom at play in this material. In this work, acting solely on the magnetic degree of freedom, we reveal an anomalous feature in the electronic transport of V 2 O 3 : On cooling, the magnetoresistance changes from positive to negative values well above the MIT temperature, and shows divergent behavior at the transition. The effects are attributed to the magnetic field quenching antiferromagnetic fluctuations above the Néel temperature T N , and preventing long-range antiferromagnetic ordering below T N. In both cases, suppressing the antiferromagnetic ordering prevents the opening of the incipient electronic gap. This interpretation is supported by Hubbard model calculations which fully reproduce the experimental behavior. Our study sheds light on this classic problem providing a clear and physical interpretation of the nature of the metal-insulator transition.

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“…MCViNE has been improved in the last four years in software infrastructure and interfaces for users. Applications of the MCViNE package at SNS include assisting design of new instruments at the second target station, design of sample environments and collimators, as well as advanced data analysis [9,11,26,27]. MCViNE is an ongoing project.…”

Section: Discussionmentioning

confidence: 99%

“…MCViNE simulations were also performed to study the effects of instrument broadening on measured data. For example, detailed MCViNE simulations of powder 4 He data measured at ARCS [9,10] and single crystal spin-wave data for V 2 O 3 measured at SEQUOIA [11] were used to examine and confirm the material and resolution models.…”

Section: Introductionmentioning

confidence: 99%

Recent developments of MCViNE and its applications at SNS

et al. 2019

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MCViNE is an open source, object-oriented Monte Carlo neutron ray-tracing simulation software package. Its design allows for flexible, hierarchical representations of sophisticated instrument components such as detector systems, and samples with a variety of shapes and scattering kernels. Recently this flexible design has enabled several applications of MCViNE simulations at the Spallation Neutron Source (SNS) at Oak Ridge National Lab, including assisting design of neutron instruments at the second target station and design of novel sample environments, as well as studying effects of instrument resolution and multiple scattering. Here we provide an overview of the recent developments and new features of MCViNE since its initial introduction (Jiao et al 2016 Nucl. Instrum. Methods Phys. Res., Sect. A 810, 86-99), and some example applications.

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Frustrated Magnetism in Mott Insulating (V1−xCrx)2<

Cited by 17 publications

References 92 publications

Nanoscale self-organisation in Mott insulators: a richness in disguise

Nanoscale self-organisation in Mott insulators: a richness in disguise

Magnetic field frustration of the metal-insulator transition in V2O3

Recent developments of MCViNE and its applications at SNS

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