Disorder-induced bulk superconductivity in ZrTe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>single crystals via growth control

Zhu, Xiyu; Lv, Bing; Wei, Fengyan; Xue, Y. Y.; Lorenz, B.; Deng, Liangzi; Sun, Yanyi; Chu, C. W.

doi:10.1103/physrevb.87.024508

Cited by 47 publications

(41 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Single crystals of ZrTe 3 were grown by a chemical vapor transport method using iodine as transport gas [40]. The crystals were characterized by x-ray powder diffraction and resistivity measurements, which confirmed that our crystals were of single phase and high quality.…”

Section: A Experimental Methodsmentioning

confidence: 90%

Charge density waves and phonon-electron coupling inZrTe3

Zheng

Ren

et al. 2015

Phys. Rev. B

View full text Add to dashboard Cite

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.

show abstract

Section: A Experimental Methodsmentioning

confidence: 90%

Charge density waves and phonon-electron coupling inZrTe3

Zheng

Ren

et al. 2015

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…31 The lattice defect disorder increases superconducting T c in CDW superconductor ZrTe 3 by factor of only 2-3. 32 Furthermore, T c (x) (Fig. 4e) cannot be explained by the fwave model of CDW that predicts linear T c (x) in 2H-TaSe 2−x S x (0 ≤ × ≤ 2), whereas increased conductivity in high-T c crystals argues against the change of the amplitude of ionic vibrations as in disordered films or amorphous lattices.…”

Section: Discussionmentioning

confidence: 99%

Superconducting order from disorder in 2H-TaSe 2− x S x

Deng

Wang

et al. 2017

npj Quant Mater

View full text Add to dashboard Cite

We report on the emergence of robust superconducting order in single crystal alloys of TaSe 2−x S x (0 ≤ × ≤ 2). The critical temperature of the alloy is surprisingly higher than that of the two end compounds TaSe 2 and TaS 2 . The evolution of superconducting critical temperature T c (x) correlates with the full width at half maximum of the Bragg peaks and with the linear term of the high-temperature resistivity. The conductivity of the crystals near the middle of the alloy series is higher or similar than that of either one of the end members 2H-TaSe 2 and/or 2H-TaS 2 . It is known that in these materials superconductivity is in close competition with charge density wave order. We interpret our experimental findings in a picture where disorder tilts this balance in favor of superconductivity by destroying the charge density wave order.npj Quantum Materials (2017) 2:11 ; doi:10.1038/s41535-017-0016-9 INTRODUCTIONThe interplay of disorder and interactions is a fruitful area of investigation. In the absence of electron-electron interactions, disorder can turn a metallic system into an Anderson insulator, 1 but can remain metallic when interactions are important. The additional complexity of competing orders such superconductivity with charge density wave (CDW) or magnetism makes this problem one of the most challenging frontiers in physics. 2-5 A large body of literature is devoted to this interplay in nearly magnetic materials. 6 The interplay of disorder and superconductivity in CDW materials have been less explored than its magnetic analog.Superconductivity and CDW are traditionally viewed as weakcoupling Fermi surface instabilities due to electron-phonon coupling. 7 Arguments have been made both for their cooperation and competition. 8,9 Hexagonal transition metal dichalcogenide 2H-TaSe 2 (P63/mmc space group) undergoes a second-order transition to an incommensurate CDW at 122 K followed by a first-order lock-in transition to a commensurate CDW (CCDW) phase at 90 K, eventually becoming superconducting below 0.14 K upon cooling. 10, 11 2H-TaS 2 has T c = 0.8 K below an in-plane CCDW at 78 K. 10,12 The CDW mechanism in 2H-TaSe 2 involves an electron instability in the bands nested away from the Fermi surface, whereas 2H-TaS 2 features a polar charge and orbital order. 13,14 CDW in 2H-TaSe 2 is dominated by hopping between next-nearest neighbors that creates three weakly coupled triangular sublattices. 15 It is of interest to note that the 2H-TaSe 2 is quasi-twodimensional (2D) metal with pseudogap and with c-axis resistivity 25-50 times higher than the in-plane resistivity, i.e., ρ c (T) >> ρ ab (T). 10,13,[16][17][18] Here, we report that in the 2H-TaSe 2−x S x alloy series the CDW is suppressed and the superconductivity is maximized with

show abstract

“…Heat capacity data suggest that SC transitions in ZrTe 3 are successive from filamentary-to-bulk with local pair fluctuations above T c ; SC phase first condenses into filaments along a-axis, becoming phase coherent below 2 K 9 . Pressure( P ), intercalation, and disorder can tune ZrTe 3 into bulk SC with suppression of CDW order 10 11 12 .…”

mentioning

confidence: 99%

Superconductivity and Charge Density Wave in ZrTe3−xSex

Zhu¹,

Ning²,

Li³

et al. 2016

Sci Rep

View full text Add to dashboard Cite

Charge density wave (CDW), the periodic modulation of the electronic charge density, will open a gap on the Fermi surface that commonly leads to decreased or vanishing conductivity. On the other hand superconductivity, a commonly believed competing order, features a Fermi surface gap that results in infinite conductivity. Here we report that superconductivity emerges upon Se doping in CDW conductor ZrTe3 when the long range CDW order is gradually suppressed. Superconducting critical temperature Tc(x) in ZrTe3−xSex (0 ≤ x ≤ 0.1) increases up to 4 K plateau for 0.04 ≤ x ≤ 0.07. Further increase in Se content results in diminishing Tc and filametary superconductivity. The CDW modes from Raman spectra are observed in x = 0.04 and 0.1 crystals, where signature of ZrTe3 CDW order in resistivity vanishes. The electronic-scattering for high Tc crystals is dominated by local CDW fluctuations at high temperatures, the resistivity is linear up to highest measured T = 300 K and contributes to substantial in-plane anisotropy.

show abstract

Disorder-induced bulk superconductivity in ZrTe3single crystals via growth control

Cited by 47 publications

References 19 publications

Charge density waves and phonon-electron coupling inZrTe3

Charge density waves and phonon-electron coupling inZrTe3

Superconducting order from disorder in 2H-TaSe 2− x S x

Superconductivity and Charge Density Wave in ZrTe3−xSex

Contact Info

Product

Resources

About