Coexistence of superconductivity and charge-density wave in the quasi-one-dimensional material HfTe3

Denholme, Saleem J.; Yukawa, Akinori; Tsumura, Kohei; Nagao, Masanori; Tamura, Ryuji; Watauchi, Satoshi; Tanaka, Isao; Takayanagi, Hideaki; Miyakawa, Nobuaki

doi:10.1038/srep45217

Cited by 52 publications

(34 citation statements)

References 32 publications

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“…A spin density wave is a spin‐density modulation and is caused by eletron‐hole pairing or singularities in the magnetic susceptibility . CDWs or SDWs were observed in many superconductors, for example Pb and Nb, HfTe 3 or NbSe 2 , and the coexistence or competition between these electronic phases is debated. Another closely related phenomena is the phonon drag effect that was recently found in undoped CoSi .…”

Section: Resultsmentioning

confidence: 99%

“…[21] The interference of the electrons with phonons lead to local binding of the free electrons and thus changes the conduction electron density of states. [23] CDWs or SDWs were observed in many superconductors, [23] for example Pb and Nb, [24] HfTe 3 [25] or NbSe 2 , [26] and the coexistence or competition between these electronic phases is debated. A CDW is connected to a structural distortion in the crystal lattice.…”

Section: Formation Of a Potential Cdw Phase Evidenced In The Temperatmentioning

confidence: 99%

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Signatures of a Charge Density Wave Phase and the Chiral Anomaly in the Fermionic Material Cobalt Monosilicide CoSi

Schnatmann

Geishendorf

Lammel

et al. 2019

Adv Elect Materials

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to the emerging class of materials with non-trivial electronic band structure like topological insulators, Dirac or Weyl materials, featuring different topologically protected electronic states. In Weyl materials, these topologically protected electronic states are highly stable quasiparticles in the bulk, known as Weyl fermions, that were first predicted by Hermann Weyl in 1929. [1] These Weyl fermions carry a non-zero chiral charge and always appear in pairs. In a common Weyl material, this chiral charge is ±1; hence, the total chiral charge is zero. In contrast, the fermionic materials host Weyl fermions that are degenerated and carry a higher chiral charge. Remarkably, recently long Fermi arcs were observed in the fermionic material CoSi by Rao et al. [2] Also, Sanchez et al. [3] discovered helicoid-arc quantum states in CoSi.A necessary condition for the existence of Weyl fermions is a broken space or time inversion symmetry. The chiral charge of the material strongly depends on the space group of the crystal structure. CoSi has a cubic B20 crystal structure (space group 198 P2 1 3) with broken space inversion symmetry. This space group was predicted to host sixfold degenerated Weyl fermions. [4] In CoSi, the Weyl fermions carry a chiral charge of up to ±4. In detail, spin 1 excitations with a chiral charge of ±2 and spin 3/2 excitations with a chiral charge of ±4 (Rarita-Schwinger-Weyl fermions) were predicted. [5,6] Electrical transport experiments are a powerful tool to probe the energy spectrum of a material and thereby the specific nature of Weyl fermions. Topological states are massless due to the linear dispersion relation, and thus have an extremely high mobility. While often superimposed by the normal band transport, contributions of the Weyl fermions increase the total electrical conductivity. Consequently, the emerging class of materials with non-trivial electronic band structure has a large overlap with other classes of functional materials like the class of thermoelectric materials. [7] This also holds for CoSi. [5,8,9] Interestingly, related silicides like MnSi, [10] Fe 0.75 Co 0.25 Si [11] and germanides like Fe 1 −x Co x Ge [12,13] also feature skyrmion states.In general, Weyl materials show characteristic quantum effects in the transport, resulting for example in quantum Materials with topological electronic states have emerged as one of the most exciting discoveries of condensed quantum matter, hosting quasiparticles with extremely low effective mass and high mobility. Weyl materials contain such topological states in the bulk and additionally have a non-trivial chiral charge. However, despite known quantum effects caused by these chiral states, the interplay between chiral states, and a charge density wave phase, an ordering of the electrons to a correlated phase is not experimentally explored. Indications for the formation of a charge density wave phase in the Weyl material cobalt monosilicide CoSi are observed. Furthermore, the typical signatures of the charge density wave phase together...

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Section: Resultsmentioning

confidence: 99%

Section: Formation Of a Potential Cdw Phase Evidenced In The Temperatmentioning

confidence: 99%

Signatures of a Charge Density Wave Phase and the Chiral Anomaly in the Fermionic Material Cobalt Monosilicide CoSi

Schnatmann

Geishendorf

Lammel

et al. 2019

Adv Elect Materials

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show abstract

“…, respectively. In high-T c oxides and other known CDW superconductors, the observed superconducting critical temperatures are lower than their dielectric counterparts: T c < T s [6,7,9,11,24,[156][157][158][159].…”

Section: Hamiltonian and Order Parametersmentioning

confidence: 96%

Quasiparticle conductance-voltage characteristics for break junctions involvingd-wave superconductors: charge-density-wave effects

Ekino¹,

Gabovich²,

Li³

et al. 2017

J. Phys.: Condens. Matter

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Quasiparticle tunnel conductance-voltage characteristics (CVCs), [Formula: see text], were calculated for break junctions (BJs) made up of layered d-wave superconductors partially gapped by charge-density waves (CDWs). The current is assumed to flow in the ab-plane of electrodes. The influence of CDWs is analyzed by comparing the resulting CVCs with CVCs calculated for BJs made up of pure d-wave superconductors with relevant parameters. The main CDW-effects were found to be the appearance of new CVC peculiarities and the loss of CVC symmetry with respect to the V-sign. Tunnel directionality was shown to be one of the key factors in the formation of [Formula: see text] dependences. In particular, the orientation of electrodes with respect to the current channel becomes very important. As a result, [Formula: see text] can acquire a large variety of forms similar to those for tunnel junctions between superconductors with s-wave, d-wave, and mixed symmetry of their order parameters. The diversity of peculiarities is especially striking at finite temperatures. In the case of BJs made up of pure d-wave superconductors, the resulting CVC can include a two-peak gap-driven structure. The results were compared with the experimental BJ data for a number of high-T oxides. It was shown that the large variety of the observed current-voltage characteristics can be interpreted in the framework of our approach. Thus, quasiparticle tunnel currents in the ab-plane can be used as an additional mean to detect CDWs competing with superconductivity in cuprates or other layered superconductors.

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“…1(a), it has a layered structure stacked along the c-direction. In each layer, 1-D chains along the b-direction spread in alignment along the a-direction [10,14,15]. Previous diffraction studies found a periodic lattice distortion in ZrTe3 [16][17][18][19][20].…”

mentioning

confidence: 93%

Thermal Dynamics of Charge Density Wave Pinning in ZrTe3

et al. 2021

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Coexistence of superconductivity and charge-density wave in the quasi-one-dimensional material HfTe3

Cited by 52 publications

References 32 publications

Signatures of a Charge Density Wave Phase and the Chiral Anomaly in the Fermionic Material Cobalt Monosilicide CoSi

Signatures of a Charge Density Wave Phase and the Chiral Anomaly in the Fermionic Material Cobalt Monosilicide CoSi

Quasiparticle conductance-voltage characteristics for break junctions involvingd-wave superconductors: charge-density-wave effects

Thermal Dynamics of Charge Density Wave Pinning in ZrTe3

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