Transport properties of single-crystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant="normal">Ti</mml:mi><mml:msub><mml:mi mathvariant="normal">Se</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mn>0.015</mml:mn><mml:mo>⩽</mml:mo><mml:mi>x</mml:mi><mml:

Wu, Gang; Yang, Hui; Zhao, Li Min; Luo, X. G.; Wu, Tao; Wang, Guoyu; Chen, X. H.

doi:10.1103/physrevb.76.024513

Cited by 98 publications

(106 citation statements)

References 24 publications

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“…In addition to correlation effects, the contribution of the density of states (DOS) should also be considered in the observed relaxation behavior. Here Cu x TiSe 2 compounds evolve into better metals as evidenced by decreasing resistivity and increasing susceptibility as Cu doping is increased [3,11]. This points to the fact that increasing Cu content introduces carriers into the TiSe 2 conduction band, increasing the DOS at the Fermi level [3] thereby enhancing the relaxation rates in agreement with our experimental data.…”

Section: Resultssupporting

confidence: 87%

“…An optical spectroscopy investigation on Cu 0.07 TiSe 2 reveals that the compound has a low carrier density and has an anomalous metallic state because of the substantial shift of the screened plasma frequency [10]. This is corroborated by the temperature-independent Hall coefficient R H observed in heavily Cu-doped samples [11]. Raman scattering measurements as a function of doping suggest that the x-dependent mode softening is associated with the reduction of electron-phonon couplings and the presence of a quantum critical point within the superconducting region [12].…”

Section: Introductionmentioning

confidence: 78%

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⁷⁷Se and⁶³Cu NMR studies of the electronic correlations in Cu_xTiSe₂(x= 0.05, 0.07)

Lumata¹,

Choi²,

Brooks³

et al. 2010

J. Phys.: Condens. Matter

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Abstract. We report 77 Se and 63 Cu nuclear magnetic resonance (NMR) investigation on the charge-density-wave (CDW) superconductor Cu x TiSe 2 (x = 0.05 and 0.07). At high magnetic fields where superconductivity is suppressed, the temperature dependence of 77 Se and 63 Cu spin-lattice relaxation rates 1/T 1 follow a linear relation. The slope of 77 1/T 1 vs T increases with the Cu doping. This can be described by a modified Korringa relation which suggests the significance of electronic correlations and the Se 4p-and Ti 3d -band contribution to the density of states at the Fermi level in the studied compounds.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 78%

⁷⁷Se and⁶³Cu NMR studies of the electronic correlations in Cu_xTiSe₂(x= 0.05, 0.07)

Lumata¹,

Choi²,

Brooks³

et al. 2010

J. Phys.: Condens. Matter

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“…Some promising alternative methods are becoming available, but their application to QCD with physical parameters and controlled discretization has not yet been achieved [8,9]. Other methods have been proposed to circumvent the sign problem: here we will focus on the Taylor expansion of thermodynamic observables around µ B = 0 [10,11] (which can be considered as a truncated version of the multiparameter reweighting [12]) and analytic continuation from imaginary chemical potentials [13,14,15].…”

Section: Bulk Properties Of Qcd Mattermentioning

confidence: 99%

Lattice QCD: bulk and transport properties of QCD matter

Ratti

2016

Nuclear Physics A

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“…Transport measurements [14,15] indicate the CDW is suppressed upon increasing the Cu content which would suggest a competition with superconductivity. A more recent report of an incommensurate CDW above the superconducting dome in pristine crystals under pressure [16] suggests a more complex scenario, where CDW fluctuations promote superconductivity.…”

mentioning

confidence: 99%

Stripe and Short Range Order in the Charge Density Wave of 1T−CuxTiSe2

et al. 2017

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We study the impact of Cu intercalation on the charge density wave (CDW) in 1T-Cu x TiSe 2 by scanning tunneling microscopy and spectroscopy. Cu atoms, identified through density functional theory modeling, are found to intercalate randomly on the octahedral site in the van der Waals gap and to dope delocalized electrons near the Fermi level. While the CDW modulation period does not depend on Cu content, we observe the formation of charge stripe domains at low Cu content (x < 0.02) and a breaking up of the commensurate order into 2 × 2 domains at higher Cu content. The latter shrink with increasing Cu concentration and tend to be phase shifted. These findings invalidate a proposed excitonic pairing as the primary CDW formation mechanism in this material. DOI: 10.1103/PhysRevLett.118.017002 Correlated electron systems are prone to develop distinct electronic ground states, such as superconductivity, charge density waves (CDWs), and spin ordered phases. The nature of the interplay between these ground states is the focus of intense research efforts. A CDW is a spatial modulation of the electron density associated with local lattice distortions. CDWs are found in a number of quasitwo-dimensional superconductors, including transition metal dichalcogenides [1], intercalated graphite [2], cuprates [3-5] and pnictides [6]. Of particular interest, largely driven by the puzzle of high temperature superconductivity, is whether charge order is competing, cooperating, or simply coexisting with superconductivity [7]. The layered transition metal dichalcogenide 1T-TiSe 2 offers an attractive playground to explore the interplay between these two electronic ground states, thus potentially contributing to resolving similar outstanding questions in cuprate superconductors and other strongly correlated materials.1T-TiSe 2 consists of a stack of van der Waals (vdW) coupled layers allowing in situ preparation of surfaces ideally suited for scanning probe investigations by cleaving. When cooled below T CDW ≃ 200 K, it undergoes a second-order phase transition into a commensurate 2 × 2 × 2 CDW superlattice [8,9]. There is currently no consensus on the origin of the CDW in this material. Two possible scenarios are being considered, one based on a purely electronic process characterized by an excitonic instability [8], while the other one involves a Jahn-Teller (JT) distortion [10]. More refined theories also propose a mixture of these two possible contributions, in the so called indirect JT transition [11][12][13].1T-TiSe 2 becomes superconducting when intercalating more than x ¼ 0.04 copper into the vdW gap, with a maximum critical temperature T c ¼ 4.1 K near x ¼ 0.08 [14]. Transport measurements [14,15] indicate the CDW is suppressed upon increasing the Cu content which would suggest a competition with superconductivity. A more recent report of an incommensurate CDW above the superconducting dome in pristine crystals under pressure [16] suggests a more complex scenario, where CDW fluctuations promote superconductivity. Traces of ...

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Transport properties of single-crystallineCuxTiSe2(0.015⩽x

Cited by 98 publications

References 24 publications

⁷⁷Se and⁶³Cu NMR studies of the electronic correlations in Cu_xTiSe₂(x= 0.05, 0.07)

⁷⁷Se and⁶³Cu NMR studies of the electronic correlations in Cu_xTiSe₂(x= 0.05, 0.07)

Lattice QCD: bulk and transport properties of QCD matter

Stripe and Short Range Order in the Charge Density Wave of 1T−CuxTiSe2

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Transport properties of single-crystallineCuxTiSe2(0.015⩽x

Cited by 98 publications

References 24 publications

77Se and63Cu NMR studies of the electronic correlations in CuxTiSe2(x= 0.05, 0.07)

77Se and63Cu NMR studies of the electronic correlations in CuxTiSe2(x= 0.05, 0.07)

Lattice QCD: bulk and transport properties of QCD matter

Stripe and Short Range Order in the Charge Density Wave of 1T−CuxTiSe2

Contact Info

Product

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⁷⁷Se and⁶³Cu NMR studies of the electronic correlations in Cu_xTiSe₂(x= 0.05, 0.07)

⁷⁷Se and⁶³Cu NMR studies of the electronic correlations in Cu_xTiSe₂(x= 0.05, 0.07)