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Nishio, Atsushi; Hiroi, Zenji

doi:10.1103/physrevb.81.121102

Cited by 38 publications

(41 citation statements)

References 33 publications

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“…30 Moreover, a pocket-vanishing type Lifshitz transition has been observed in Na x CoO 2 as a function of carrier density. 31 Note that all the known Lifshitz transitions are metal-metal transitions, while the present compound possibly gives a first example of a Lifshitz-type metal-insulator transition, where all the FSs are gone. One notable feature on the band structure of Cd 2 Os 2 O 7 , which makes the Lifshitz MIT possible, is the small overlap in energy between the electron and hole bands: according to the band structure calculations, the MIT can occur when the bottom or top of each band moves by ∼60 meV to get rid of the overlap between them.…”

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confidence: 78%

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd₂Os₂O₇

et al. 2015

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We investigate the metal-insulator transition (MIT) of the osmium pyrochlore oxide Cd 2 Os 2 O 7 through transport and magnetization measurements. The MIT and a magnetic transition to the all-in/all-out (AIAO) order occur simultaneously at 227 K. We propose a mechanism based on a Lifshitz transition induced by the AIAO magnetic order probably via strong spin-orbit couplings in the specific semimetallic band structure. It is suggested, moreover, that two observed puzzles, a finite conductivity near T = 0 and an emergence of weak ferromagnetic moments, are not bulk properties but originate at magnetic domain walls between two kinds of AIAO domains.

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confidence: 78%

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd₂Os₂O₇

et al. 2015

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“…(1) A magnetic critical point exists in the vicinity of x c ≈ 0.5, which separates the Pauli-paramagnetic and Curie-Weiss metals. 8,32,33 (2) The thermoelectric property significantly depends on the Na content. [34][35][36][37] The S value is greatly enhanced as x increases in the Curie-Weiss regime (i.e., x > x c ), while it is small with positive sign in the Pauli-paramagnetic regime (x < x c ).…”

Section: Discussionmentioning

confidence: 99%

Impact of lithium composition on the thermoelectric properties of the layered cobalt oxide system LixCoO2

et al. 2011

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Thermoelectric properties of the layered cobalt oxide system Li x CoO 2 were investigated in a wide range of Li compositions, 0.98 x 0.35. Single-phase bulk samples of Li x CoO 2 were successfully obtained through electrochemical deintercalation of Li from the pristine LiCoO 2 phase. While Li x CoO 2 with x 0.94 is semiconductive, the highly Li-deficient phase (0.75 x 0.35) exhibits metallic conductivity. The magnitude of the Seebeck coefficient at 293 K (S 293K ) significantly depends on the Li content (x). The S 293K value is as large as +70 up to +100 μV/K for x 0.94, and it rapidly decreases from +90 μV/K to +10 μV/K as x is lowered within a Li composition range of 0.75 x 0.50. This behavior is in sharp contrast to the results of x 0.40 for which the S 293K value is small and independent of x (+10 μV/K), indicating that a discontinuous change in the thermoelectric characteristics takes place at x = 0.40-0.50. The unusually large Seebeck coefficient and metallic conductivity are found to coexist in a narrow range of Li composition at about x = 0.75. The coexistence, which leads to an enhanced thermoelectric power factor, may be attributed to unusual electronic structure of the two-dimensional CoO 2 block.

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“…Note that recent experimental evidence in favor of a Lifshitz phase transition in Na x CoO 2 seems to suggest that the transition is indeed of first order in this material. 50 Other interactioninduced nonsymmetry-breaking phase transitions involving a change in topology of the Fermi surface have been discussed in Refs. 12, 49, 51, and 52.…”

Section: A Theory Of the Quantum Phase Transitionmentioning

confidence: 99%

Lifshitz transitions and crystallization of fully polarized dipolar fermions in an anisotropic two-dimensional lattice

2010

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We consider a two-dimensional model of noninteracting chains of spinless fermions weakly coupled via a small interchain hopping and a repulsive interchain interaction. The phase diagram of this model has a surprising feature: an abrupt change in the Fermi surface as the interaction is increased. We study in detail this metanematic transition and show that the well-known 2 1 2 -order Lifshitz transition is the critical end point of this first-order quantum phase transition. Furthermore, in the vicinity of the end point, the order parameter has a nonperturbative BCS-type form. We also study a competing crystallization transition in this model and derive the full phase diagram. This physics can be demonstrated experimentally in dipolar ultracold atomic or molecular gases. In the presence of a harmonic trap, it manifests itself as a sharp jump in the density profile.

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Discontinuous Lifshitz transition achieved by band-filling control inNaxCoO2

Cited by 38 publications

References 33 publications

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd₂Os₂O₇

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd₂Os₂O₇

Impact of lithium composition on the thermoelectric properties of the layered cobalt oxide system LixCoO2

Lifshitz transitions and crystallization of fully polarized dipolar fermions in an anisotropic two-dimensional lattice

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Discontinuous Lifshitz transition achieved by band-filling control inNaxCoO2

Cited by 38 publications

References 33 publications

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd2Os2O7

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd2Os2O7

Impact of lithium composition on the thermoelectric properties of the layered cobalt oxide system LixCoO2

Lifshitz transitions and crystallization of fully polarized dipolar fermions in an anisotropic two-dimensional lattice

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Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd₂Os₂O₇

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd₂Os₂O₇