Coherent heavy charge carriers in an organic conductor near the bandwidth-controlled Mott transition

Oberbauer, Sebastian; Erkenov, S.; Biberacher, W.; Kushch, N. D.; Gross, Rudolf; Kartsovnik, M.V.

doi:10.1103/physrevb.107.075139

Cited by 7 publications

(4 citation statements)

References 107 publications

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“…The beatings of MQO amplitude due to the interlayer electron hopping were observed in many other layered materials [4,5,[20][21][22][23][24]. Note that the phase shift of beats is observed not only between the SdH and dHvA effect, but also between the oscillations of other quantities, e.g., the interlayer magnetoresistance and thermopower [21], or magnetoresistance and specific heat [25].…”

Section: Introductionmentioning

confidence: 74%

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3D – 2D Crossover and Phase Shift of Beats of Quantum Oscillations of Interlayer Magnetoresistance in Quasi-2D Metals

Mogilyuk,

Grigoriev,

Kochev

et al. 2024

Preprint

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Magnetic quantum oscillations (MQO) are traditionally applied to investigate the electronic structure of metals. In layered quasi-two-dimensional (Q2D) materials the MQO have several qualitative features giving additional useful information, provided their theoretical description is developed. Within the framework of the Kubo formula and the self-consistent Born approximation, we reconsider the phase of beats in the amplitude of Shubnikov oscillations of interlayer conductivity in Q2D metals. We show that the phase shift of beats of the Shubnikov (conductivity) oscillations relative to the de Haas - van Alphen (magnetization) oscillations is larger than expected previously and, under certain conditions, can reach the value of π/2, as observed experimentally. We explain the phase inversion of MQO during the 3D - 2D crossover and predict the decrease of relative MQO amplitude of interlayer magnetoresistance in a strong magnetic field, larger than the beat frequency.

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Section: Introductionmentioning

confidence: 74%

“…We see that our theory describes the phase inversion of the SdH oscillations during the 3D →2D crossover. The above analysis is generic to layered Q2D metals and can be applied to a very large class of layered compounds, which are actively studied by MQO till nowadays [24,[26][27][28][29][52][53][54][55].…”

Section: Discussionmentioning

confidence: 99%

3D – 2D Crossover and Phase Shift of Beats of Quantum Oscillations of Interlayer Magnetoresistance in Quasi-2D Metals

Mogilyuk,

Grigoriev,

Kochev

et al. 2024

Preprint

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show abstract

Section: Discussionmentioning

confidence: 90%

“…Spatial phase segregation may also happen near the quantum critical point of the Mott-AFM metal-insulator phase transition, e.g., as observed in the κ-(BEDT-TTF) 2 X family of organic superconductors [69][70][71][72]. The observation of clear magnetic quantum oscillations [71,72] in the almost insulating phase of these materials indicates a rather large size d of metal/SC domains in the Mott insulator media, comparable to the electron cyclotron radius. Although the first of our methods, based on the Ginzburg-Landau SDW free energy expansion, is not applicable in this case, our second method [49,50], based on the calculation of percolation anisotropy in finite-sized samples, should work well and give valuable information about the shape and size of metal/SC domains.…”

Section: Discussionmentioning

confidence: 90%

On the Size of Superconducting Islands on the Density-Wave Background in Organic Metals

2023

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Most high-Tc superconductors are spatially inhomogeneous. Usually, this heterogeneity originates from the interplay of various types of electronic ordering. It affects various superconducting properties, such as the transition temperature, the magnetic upper critical field, the critical current, etc. In this paper, we analyze the parameters of spatial phase segregation during the first-order transition between superconductivity (SC) and a charge- or spin-density wave state in quasi-one-dimensional metals with imperfect nesting, typical of organic superconductors. An external pressure or another driving parameter increases the transfer integrals in electron dispersion, which only slightly affects SC but violates the Fermi surface nesting and suppresses the density wave (DW). At a critical pressure Pc, the transition from a DW to SC occurs. We estimate the characteristic size of superconducting islands during this phase transition in organic metals in two ways. Using the Ginzburg–Landau expansion, we analytically obtain a lower bound for the size of SC domains. To estimate a more specific interval of the possible size of the superconducting islands in (TMTSF)2PF6 samples, we perform numerical calculations of the percolation probability via SC domains and compare the results with experimental resistivity data. This helps to develop a consistent microscopic description of SC spatial heterogeneity in various organic superconductors.

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Truncated mass divergence in a Mott metal

Semeniuk,

Chang,

Baglo

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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The Mott metal–insulator transition represents one of the most fundamental phenomena in condensed matter physics. Yet, basic tenets of the canonical Brinkman-Rice picture of Mott localization remain to be tested experimentally by quantum oscillation measurements that directly probe the quasiparticle Fermi surface and effective mass. By extending this technique to high pressure, we have examined the metallic state on the threshold of Mott localization in clean, undoped crystals of NiS 2 . We find that i) on approaching Mott localization, the quasiparticle mass is strongly enhanced, whereas the Fermi surface remains essentially unchanged; ii) the quasiparticle mass closely follows the divergent form predicted theoretically, establishing charge carrier slowdown as the driver for the metal–insulator transition; iii) this mass divergence is truncated by the metal–insulator transition, placing the Mott critical point inside the insulating section of the phase diagram. The inaccessibility of the Mott critical point in NiS 2 parallels findings at the threshold of ferromagnetism in clean metallic systems, in which criticality at low temperature is almost universally interrupted by first-order transitions or novel emergent phases such as incommensurate magnetic order or unconventional superconductivity.

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Coherent heavy charge carriers in an organic conductor near the bandwidth-controlled Mott transition

Cited by 7 publications

References 107 publications

3D – 2D Crossover and Phase Shift of Beats of Quantum Oscillations of Interlayer Magnetoresistance in Quasi-2D Metals

3D – 2D Crossover and Phase Shift of Beats of Quantum Oscillations of Interlayer Magnetoresistance in Quasi-2D Metals

On the Size of Superconducting Islands on the Density-Wave Background in Organic Metals

Truncated mass divergence in a Mott metal

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