Coexistence of Bulk Superconductivity and Charge Density Wave in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Cu</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>ZrTe</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Zhu, Xiangde; Lei, Hechang; Petrović, C.

doi:10.1103/physrevlett.106.246404

Cited by 53 publications

(63 citation statements)

References 38 publications

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“…In contrast, a similar resistivity anomaly is very weak or absent in the b axis. Filamentary superconductivity is observed below T ≈ 3 K. These results are consistent with previous reports [18,45]. The small residual resistance at low temperatures demonstrates the high quality of our samples.…”

Section: Resultssupporting

confidence: 82%

Charge density waves and phonon-electron coupling inZrTe3

Zheng

Ren

et al. 2015

Phys. Rev. B

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Charge-density-wave (CDW) order has long been interpreted as arising from a Fermi-surface instability in the parent metallic phase. While phonon-electron coupling has been suggested to influence the formation of CDW order in quasi-two-dimensional (quasi-2D) systems, the presumed dominant importance of Fermi-surface nesting remains largely unquestioned in quasi-1D systems.Here we show that phonon-electron coupling is also important for the CDW formation in a model quasi-1D system ZrTe 3 . Our joint experimental and computational study reveals that particular lattice vibrational patterns possess exceedingly strong coupling to the conduction electrons, and are directly linked to the lattice distortions associated with the CDW order. The dependence of the coupling matrix elements on electron momentum further dictates the opening of (partial) electronic gaps in the CDW phase. Since lattice distortions and electronic gaps are the defining signatures of CDW order, our result demonstrates that the conventional wisdom based on Fermisurface geometry needs to be substantially supplemented by phonon-electron coupling even in the simplest quasi-1D case. As prerequisites for the CDW formation, the highly anisotropic electronic structure and strong phonon-electron coupling in ZrTe 3 give rise to a distinct Raman scattering effect, namely, measured phonon linewidths depend on the direction of momentum transfer in the scattering process.

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Section: Resultssupporting

confidence: 82%

Charge density waves and phonon-electron coupling inZrTe3

Zheng

Ren

et al. 2015

Phys. Rev. B

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“…A recent study has reported the coexistence of bulk superconductivity and CDW in Cu intercalated ZrTe 3 , Cu 0.06 ZrTe 3 . 41 It is interesting to note that "mixed bulkfilament superconductivity" turns to bulk superconductivity with increasing Cu intercalation.…”

Section: Resultsmentioning

confidence: 99%

Mixed bulk-filament nature in superconductivity of the charge-density-wave conductor ZrTe3

2012

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We have shown that the superconducting transitions in ZrTe 3 are successive from filamentary to bulk, based on experimental results obtained for a superconducting specific-heat anomaly and the anisotropic superconducting transition curve of resistivity. A small jumplike superconducting specific-heat anomaly with a large and widely extended tail was observed to closely follow the anisotropic zero-resistance transition. We concluded that the jumplike anomaly signifies the onset of the long-range order of Cooper pairs with the opening of a superconducting gap at T C , while the large and widely extended tail indicates behavior induced by Cooper pairs with a very short coherence length. As a limit for a very short coherence length, we propose local pairs with Bose characteristics. As a result, we can understand that the filamentary superconductivity is caused by the local pairs, and the large and widely extended tail is in a crossover region between superconductivity induced by local pairs and that induced by Cooper pairs. Based on a discussion about the origin of the change in the pair coupling from the starting of local pairing to Cooper pairing in ZrTe 3 , we conclude that "mixed bulk-filament superconductivity" results from unique electronic structural changes in the quasi-1D + 3D (D, dimensional) Fermi surfaces after the CDW transition.

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“…In general, those phases are detrimental to each other. Therefore the coexistence of those phases in a system has been a long-standing subject of importance in the physics of low-dimensional systems123456. The Pt-based layered superconductors, SrPt 2 As 2 and LaPt 2 Si 2 , of the present study belong to such quasi two-dimensional (2D) systems, which exhibit the coexistence of the CDW and the SC at low temperature ( T )78.…”

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confidence: 95%

The mechanism of charge density wave in Pt-based layered superconductors: SrPt2As2 and LaPt2Si2

Kim

Min

2015

Sci Rep

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The intriguing coexistence of the charge density wave (CDW) and superconductivity in SrPt2As2 and LaPt2Si2 has been investigated based on the ab initio density functional theory band structure and phonon calculations. We have found that the CDW instabilities for both cases arise from the q-dependent electron-phonon coupling with quasi-nesting feature of the Fermi surface. The band structure obtained by the band-unfolding technique reveals the sizable q-dependent electron-phonon coupling responsible for the CDW instability. The local split distortions of Pt atoms in the [As-Pt-As] layers play an essential role in driving the five-fold supercell CDW instability as well as the phonon softening instability in SrPt2As2. By contrast, the CDW and phonon softening instabilities in LaPt2Si2 occur without split distortions of Pt atoms. The phonon calculations suggest that the CDW and the superconductivity coexist in [X-Pt-X] layers (X = As or Si) for both cases.

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Coexistence of Bulk Superconductivity and Charge Density Wave inCuxZrTe3

Cited by 53 publications

References 38 publications

Charge density waves and phonon-electron coupling inZrTe3

Charge density waves and phonon-electron coupling inZrTe3

Mixed bulk-filament nature in superconductivity of the charge-density-wave conductor ZrTe3

The mechanism of charge density wave in Pt-based layered superconductors: SrPt2As2 and LaPt2Si2

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