Fragile 3D Order in 
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Davenport, Matthew A.; Krogstad, Matthew; Whitt, Logan M.; Hu, Chaowei; Douglas, Tyra C.; Ni, Ni; Rosenkranz, S.; Osborn, R.; Allred, Jared M.

doi:10.1103/physrevlett.127.125501

Cited by 7 publications

(9 citation statements)

References 33 publications

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“…Also, small lower intensity positive peaks are observed at the coordinates of . The 3D-ΔPDF map looks very similar to the same map for the 2D-M2 phase in 19% Mo doped VO 2 at a low temperature, and a similar interpretation applies . To summarize, the positive (negative) peaks at integer lattice vector points correspond to maintained (broken) translational symmetry, meaning that the unit cell is doubled within this plane, consistent with the k = [1/2,0,1/2] ordering vector.…”

Section: Resultssupporting

confidence: 70%

“…There, an anisotropic, short-range ordered phase at moderate Mo substitutions (0.19 ≤ x ≤ 0.40) is found, which is characterized by essentially 2D ordered domains embedded along the diagonal (110) and (1̅10) rutile directions (Figure e). Quite similar to the 1974 report on Nb 0.10 V 0.90 O 2 , the planes exhibit ordering equivalent to the M2 structure . The recent work on the Mo phases, however, utilized high-resolution total X-ray scattering and the three-dimensional difference pair distribution function (3D-ΔPDF) method.…”

Section: Introductionmentioning

confidence: 66%

“…(a) Comparison between the electronic phase transition and structural phase transition measurements in the 0 ≤ x ≤ 0.20 regime using data from the present study and refs , , , . T s is the upper limit onset for the LT phase; error bars represent the step size.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast to the previous models, this geometric frustration model highlights how competing interactions necessarily accompany metal–metal bond formation in the rutile aristotype, an overlooked fact that underpins the structural phase formation in pure and doped VO 2 . It implies that VO 2 itself exists near a critical point where strong, competing interactions frustrate the ordering of atomic displacements in three dimensions. , …”

Section: Introductionmentioning

confidence: 99%

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Geometric Frustration Suppresses Long-Range Structural Distortions in Nb_xV_1–xO₂

et al. 2022

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Though NbO2 and VO2 both exhibit similar electrostructural phase transitions, alloying the two completely suppresses ordering of either kind. It is mostly accepted that impurity ions act as electron-localizing defects, which weaken ordering in a percolative manner. This work reports total X-ray scattering measurements across the Nb x V1–x O2 phase diagram that challenge this prevailing notion. The observations are instead more consistent with the geometric frustration of displacement models recently used to explain the suppression of long-range structural order in the V1–x Mo x O2 phase diagram. Two separate short-range ordered phases are observed in the Nb x V1–x O2 phase diagram, one of which has not been observed before. The structure of this new phase was not determined in the present study, and it is provisionally named 2D-u to indicate that the phase is likely two-dimensional and that it is unknown whether it is a new or existing structure. The other phase, stabilized around 10% Nb substitution, is shown to be structurally equivalent to the 2D-M2 phase that appears at or above 19% Mo substitution, except that it coincides with the insulator side of a metal-to-insulator transition (MIT), while the Mo analog does not. This shows that the MIT intrinsic to VO2 can persist into the quasi-two-dimensionally ordered state.

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Section: Resultssupporting

confidence: 70%

Section: Introductionmentioning

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geometric Frustration Suppresses Long-Range Structural Distortions in Nb_xV_1–xO₂

et al. 2022

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“…In actuality, this is the long-range structure for all of the materials studied, but in many cases there are diffuse peaks that indicate complex short-range ordering. Characterization of the diffuse scattering is an ongoing endeavor. , …”

Section: Resultsmentioning

confidence: 99%

Large Single Crystals of V_1–xMo_xO₂ from a Two-Step Chemical Vapor Transport Synthesis

Davenport

Confer

Douglas

et al. 2020

Crystal Growth & Design

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Single crystals of molybdenum doped VO 2 with the formula V 1−x Mo x O 2 have been successfully synthesized with molybdenum compositions up to x = 0.60. These crystals were obtained using a novel, two-step chemical vapor transport (CVT) synthesis. The first CVT reaction uses a stoichiometric amount of VO 2 , V 2 O 3 , MoO 2 , and MoO 3 with MoCl 3 as a transport agent to produce a largely polycrystalline, single phase V 1−x Mo x O 2 product. This product can then be pulverized and used in a second CVT reaction with TeCl 4 as a transport agent to produce large single crystals. This two-step synthetic method results in larger single crystals with a higher degree of compositional control compared to any single step CVT syntheses attempted, as well as allowing for an increase in dopant range compared to what had previously been achieved for this dopant system. Crystals obtained from this synthetic method are ideal for physical property measurements and diffuse scattering experiments which require large samples to be able to properly mount the samples and obtain useful data.

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Metal-insulator transition tuned by valence variation of Nb dopants in Nb-doped VO2 films

Zhao

Yang

et al. 2023

Applied Surface Science

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Fragile 3D Order in V1−xMoxO2

Cited by 7 publications

References 33 publications

Geometric Frustration Suppresses Long-Range Structural Distortions in Nb_xV_1–xO₂

Geometric Frustration Suppresses Long-Range Structural Distortions in Nb_xV_1–xO₂

Large Single Crystals of V_1–xMo_xO₂ from a Two-Step Chemical Vapor Transport Synthesis

Metal-insulator transition tuned by valence variation of Nb dopants in Nb-doped VO2 films

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Fragile 3D Order in V1−xMoxO2

Cited by 7 publications

References 33 publications

Geometric Frustration Suppresses Long-Range Structural Distortions in NbxV1–xO2

Geometric Frustration Suppresses Long-Range Structural Distortions in NbxV1–xO2

Large Single Crystals of V1–xMoxO2 from a Two-Step Chemical Vapor Transport Synthesis

Metal-insulator transition tuned by valence variation of Nb dopants in Nb-doped VO2 films

Contact Info

Product

Resources

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Geometric Frustration Suppresses Long-Range Structural Distortions in Nb_xV_1–xO₂

Geometric Frustration Suppresses Long-Range Structural Distortions in Nb_xV_1–xO₂

Large Single Crystals of V_1–xMo_xO₂ from a Two-Step Chemical Vapor Transport Synthesis