Pseudogap of Metallic Layered Nickelate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>R</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>NiO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mi>Nd</mml:mi><mml:mo>,</mml:mo><mml:mi>

Uchida, Masaki; Ishizaka, K.; Hansmann, P.; Kaneko, Yoshio; Ishida, Y.; Yang, Xiaoping; Kumai, Reiji; Toschi, A.; Onose, Y.; Arita, Ryotaro; Held, Karsten; Andersen, O. K.; Shin, Shik; Tokura, Y.

doi:10.1103/physrevlett.106.027001

Cited by 59 publications

(53 citation statements)

References 36 publications

(43 reference statements)

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“…Recently, Fermi-arc like behavior has been observed in a metallic phase adjacent to a CO phase for a metallic layered nickelate Eu 2Àx Sr x NiO 4 . 58) The formation of a Fermi arc might be characteristic to metallic states with strong charge fluctuations.…”

Section: Charge-ordered Phasementioning

confidence: 99%

Mott Transition and Phase Diagram of κ-(BEDT-TTF)₂Cu(NCS)₂Studied by Two-Dimensional Model Derived fromAb initioMethod

et al. 2012

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We present an ab initio analysis for the ground-state properties of a correlated organic compound -(BEDT-TTF) 2 Cu(NCS) 2 . First, we derive an effective two-dimensional low-energy model from first principles, having shortranged transfers and short-ranged Coulomb and exchange interactions. Then, we perform many-variable variational Monte Carlo calculations for this model and draw a ground-state phase diagram as functions of scaling parameters for the onsite and off-site interactions. The phase diagram consists of three phases; a paramagnetic metallic phase, an antiferromagnetic (Mott) insulating phase, and a charge-ordered phase. In the phase diagram, the parameters for the real compound are close to the first-order Mott transition, being consistent with experiments. We show that the off-site Coulomb and exchange interactions affect the phase boundary; (i) they appreciably stabilize the metallic state against the Mott insulating phase and (ii) enhance charge fluctuations in a wide parameter region in the metallic phase. We observe arc-like structure in Fermi surface around the region where the charge fluctuations are enhanced. Possible relevance of the charge fluctuations to the experimentally observed dielectric anomaly in the -BEDT-TTF family compounds is also pointed out.

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Section: Charge-ordered Phasementioning

confidence: 99%

Mott Transition and Phase Diagram of κ-(BEDT-TTF)₂Cu(NCS)₂Studied by Two-Dimensional Model Derived fromAb initioMethod

et al. 2012

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“…The low conductivity in La 2−x Sr x NiO 4 at moderate doping is attributed to the formation of small polarons [43,44]. Besides the interest in the the stripe ordering of charges and electrons discussed here, doped nickelates attract strong attention due to the observation of an electric-field driven brake down of the insulating state [45], due to a dielectric anomaly reflecting the glassy electronic state [46], and most recently due to the hole Fermi surface observed for a d x 2 −y 2 band in highly doped materials [47].…”

Section: Stripe Order Of Charges and Magnetic Moments In Layered Nickmentioning

confidence: 99%

Neutron scattering studies on stripe phases in non-cuprate materials

Ulbrich

Braden

2012

Physica C: Superconductivity

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Several non-cuprates layered transition-metal oxides exhibit clear evidence for stripe ordering of charges and magnetic moments. Therefore, stripe order should be considered as the typical consequence of doping a Mott insulator, but only in cuprates stripe order or fluctuating stripes coexist with metallic properties. A linear relationship between the charge concentration and the incommensurate structural and magnetic modulations can be considered as the finger print of stripe ordering with localized degrees of freedom. In nickelates and in cobaltates with K 2 NiF 4 structure, doping suppresses the nearest-neighbor antiferromagnetism and induces stripe order. The higher amount of doping needed to induce stripe phases in these non-cuprates series can be attributed to reduced charge mobility. Also manganites exhibit clear evidence for stripe phases with further enhanced complexity, because orbital degrees of freedom are involved. Orbital ordering is the key element of stripe order in manganites since it is associated with the strongest structural distortion and with the perfectly fulfilled relation between doping and incommensurability. Magnetic excitations in insulating stripe phases exhibit strong similarity with those in the cuprates, but only for sufficiently short magnetic correlation lengths reflecting well-defined magnetic stripes that are only loosely coupled.

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“…For example, the non-superconducting nickelate Eu 0.9 Sr 1.1 NiO 4 exhibits one. 13 It is also worth noting that other groups have measured ARPES on bulk-doped iridates 14 but do not see this Fermi arc phenomenology. So, the jury remains out on the possible connections between Sr 2 IrO 4 electronic structure and that of the cuprates.…”

mentioning

confidence: 99%

Sr2IrO4: Gateway to cuprate superconductivity?

Mitchell

2015

APL Materials

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Pseudogap of Metallic Layered NickelateR2−xSrxNiO4(R=Nd,

Cited by 59 publications

References 36 publications

Mott Transition and Phase Diagram of κ-(BEDT-TTF)₂Cu(NCS)₂Studied by Two-Dimensional Model Derived fromAb initioMethod

Mott Transition and Phase Diagram of κ-(BEDT-TTF)₂Cu(NCS)₂Studied by Two-Dimensional Model Derived fromAb initioMethod

Neutron scattering studies on stripe phases in non-cuprate materials

Sr2IrO4: Gateway to cuprate superconductivity?

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Pseudogap of Metallic Layered NickelateR2−xSrxNiO4(R=Nd,

Cited by 59 publications

References 36 publications

Mott Transition and Phase Diagram of κ-(BEDT-TTF)2Cu(NCS)2Studied by Two-Dimensional Model Derived fromAb initioMethod

Mott Transition and Phase Diagram of κ-(BEDT-TTF)2Cu(NCS)2Studied by Two-Dimensional Model Derived fromAb initioMethod

Neutron scattering studies on stripe phases in non-cuprate materials

Sr2IrO4: Gateway to cuprate superconductivity?

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Mott Transition and Phase Diagram of κ-(BEDT-TTF)₂Cu(NCS)₂Studied by Two-Dimensional Model Derived fromAb initioMethod

Mott Transition and Phase Diagram of κ-(BEDT-TTF)₂Cu(NCS)₂Studied by Two-Dimensional Model Derived fromAb initioMethod