Nanoregions of rocksalt AgI in AgBr microcrystals

Marchetti, Alfred P.; Hansen, J. C.; Chen, S.; Irving, MA; Baetzold, R. C.; Sever, B. R.

doi:10.1103/physrevb.69.094107

Cited by 9 publications

(17 citation statements)

References 16 publications

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“…If we reinsert the charge-vortices, and assume for the corresponding semionic holons an exclusion statistics 1/2, then these holons have the same FS of the fermionic spinons of the slave-boson approach in the π-flux phase 6 , and the same dispersion: ω h ∼ 2t[ cos 2 k x + cos 2 k y − δ], where δ denotes the density of empty sites, corresponding in cuprates to the in-plane doping concentration. When these holons are coupled to spinons through the self-generated slave-particle gauge field, as a consequence of the Dirac structure of the holons the resulting holon-spinon bound state generated in the low-energy limit exhibits Fermi arcs qualitatively consistent with those found in ARPES experiments in the pseudogap "phase" in cuprates 22 . The underlying FS for the hole is modified w.r.t.…”

Section: Introductionsupporting

confidence: 61%

Charge carriers with fractional exclusion statistics in cuprates

Marchetti

et al. 2019

Phys. Rev. B

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We show that in the SU (2) × U (1) spin-charge gauge approach we developed earlier one can attribute consistently an exclusion statistics with parameter 1/2 to the spinless charge carriers of the t-J model in two dimensions (2D), as it occurs in one dimension (1D). Like the 1D case, the no-double occupation constraint is at the origin of this fractional exclusion statistics. With this statistics we recover a "large" Fermi volume of holes at high dopings, close to that of the tight binding approximation. Furthermore, the composite nature of the hole, made of charge and spin carriers only weakly bounded, can provide a natural explanation of many unusual experimental features of the hole-doped cuprates.

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Section: Introductionsupporting

confidence: 61%

Charge carriers with fractional exclusion statistics in cuprates

Marchetti

et al. 2019

Phys. Rev. B

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“…A more careful treatment of the semionic features is presently under investigation [11], but here we follow the approximate treatment. Even within this approximation scheme, universality and a good agreement with experimental data emerge for the quantities we consider here and elsewhere [13,14,7].…”

Section: Introductionsupporting

confidence: 72%

“…In this work we focus on the in-plane resistivity, an analysis of the off-plane resistivity within the present formalism can be found in Ref. [14].…”

Section: Universality In Resistivitymentioning

confidence: 99%

Universality in Cuprates: A Gauge Approach

Marchetti¹,

Bighin²

2016

J Low Temp Phys

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In high-Tc cuprates,many quantities exhibit a non-Fermi liquid universality\ud hinting at a very peculiar structure of the underlying pairing mechanism for superconductivity:\ud in this work, we focus on the universality for the in-plane resistivity and the\ud superfluid density. We outline the previously developed spin–charge gauge approach\ud to superconductivity in hole-doped cuprates: we decompose the hole of the t −t' − J\ud model for the CuO2 planes as the product of a spinful, chargeless gapped spinon and\ud a spinless, charged holon with Fermi surface. Each one of these particle excitations is\ud bound to a statistical gauge flux, allowing one to optimize their statistics.We show that\ud this model allows for a natural interpretation of the universality: within this approach,\ud under suitable conditions, the spinonic and holonic contributions to a response function\ud sum up according to the Ioffe–Larkin rule.We argue that, if the spinonic contribution\ud dominates, then one should expect strongly non-Fermi-liquid-like universality, due\ud to the insensitivity of spinons to Fermi surface details. The in-plane resistivity and\ud superfluid density are indeed dominated by spinons in the underdoped region.We theoretically\ud derive these quantities, discussing their universal behaviours and comparing\ud them with experimental data

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“…In fact a weak binding is precisely the result obtained in 2D within some approximations in Refs. [26], [27] for the hole as composite of spinon and holon and for the magnon as a composite of spinon and anti-spinon. They exhibit a "small" resonance life-time, T -dependent, originated from the slave-particle gauge coupling, leading to a behaviour of these excitations less coherent than in a standard Fermi-liquid.…”

Section: The Slave-particle Gauge Fieldmentioning

confidence: 99%

The attraction between antiferromagnetic quantum vortices as origin of superconductivity in cuprates

Marchetti

2018

Topological Phase Transitions and New Developments

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We propose as key of superconductivity in (hole-doped) cuprates a novel excitation of magnetic origin, characteristic of two-dimensions and of purely quantum nature: the antiferromagnetic spin vortices. In this formalism the charge pairing arises from a Kosterlitz-Thouless-like attraction between such vortices centered on opposite Néel sublattices. This charge pairing induces also the spin pairing through the action of a gauge force generated by the nodouble occupation constraint imposed in the t-J model of the CuO planes of the cuprates. Superconductivity arises from coherence of pairs of excitations describing Zhang-Rice singlets and it is not of standard BCS type. We show that many experimental features of the cuprates can find a natural explanation in this formalism. * jβ . This

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Nanoregions of rocksalt AgI in AgBr microcrystals

Cited by 9 publications

References 16 publications

Charge carriers with fractional exclusion statistics in cuprates

Charge carriers with fractional exclusion statistics in cuprates

Universality in Cuprates: A Gauge Approach

The attraction between antiferromagnetic quantum vortices as origin of superconductivity in cuprates

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