Superconductivity and Charge Density Wave in ZrTe3−xSex

Zhu, Xiangde; Ning, Wei; Li, Lijun; Ling, Langsheng; Zhang, Ranran; Zhang, Jinglei; Wang, Kefeng; Liu, Yu; Pi, Li; Ma, Yonghui; Du, Haifeng; Tian, Minglian; Sun, Yan; Petrović, C.; Zhang, Yuheng

doi:10.1038/srep26974

Cited by 55 publications

(63 citation statements)

References 35 publications

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“…To the best of our knowledge such a sharp maximum in T c (x) has never been observed at a structural or CDW QCP (see Supplementary Note 5). Instead, CDW usually exhibits an almost constant or only slowly decreasing T c on the non-ordered side of the critical point 16,17,20,21 . We can, for example, compare it with the series (Ca 1−x Sr x ) 3 Rh 4 Sn 13 and (Ca 1−x Sr x ) 3 Ir 4 Sn 13 , which have recently attracted strong attention in the context of structural quantum criticality and SC.…”

Section: Substituting Pd For Pt Suppressesmentioning

confidence: 99%

“…Yet, in this case, it can easily be explained within the standard BCS-based theories: the gap associated with the CDW closes at the critical point, resulting in an increase of N ( F ), which, in turn, leads to an increase of the SC transition temperature T c . As a consequence, the dependence of T c on the tuning parameter is usually rather weak in the non-CDW regime beyond the critical point 16,17,[20][21][22][23] . There is currently no clear evidence that quantum critical fluctuations associated with the CDW QCP have any effect on the SC 24 .…”

Section: Substituting Pd For Pt Suppressesmentioning

confidence: 99%

“…Some CDW transitions can be tuned to a T = 0 critical point as well [15][16][17][18][19][20][21] . The appearance or a strengthening of a superconducting state is frequently found near the vanishing point of the CDW state, similar to magnetic QCPs.…”

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Charge density wave quantum critical point with strong enhancement of superconductivity

et al. 2017

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led to a great interest in QCPs are the very unusual properties that are observed near a QCP, such as unconventional superconductivity (SC), non-Fermi-liquid or anomalous critical behaviour 3-6 . Quantum fluctuations are therefore suspected to cause these anomalous properties, but most aspects are far from being understood and are still the subject of active discussions. An issue that has attracted great interest is the appearance of unconventional SC observed at magnetic QCPs, that is where a magnetic ordered state is suppressed. Such unconventional SC states have been reported for very different kinds of compounds, for example heavy-fermion systems 3,7 , cuprates 8,9 and iron pnictides 10,11 . There is some evidence that backs up the hypothesis that the binding of electrons into the superconducting Cooper pairs is not mediated by phononic excitations as in classical superconductors, but by magnetic excitations connected to the disappearing magnetic order 12,13 . The fact that SC is observed only in the vicinity of the QCP and presents a strong dependence on the tuning parameter supports this hypothesis. It often results in a dome-like shape of the phase diagram of tuning parameter versus temperature.However, QCPs are not restricted to magnetic systems; they can be associated with any continuous phase transition. While searching for appropriate non-magnetic systems that show a QCP with associated SC, we looked at compounds that show a charge density wave (CDW) type of structural transition. CDW systems present an instability of the electronic states close to the Fermi level F , which results in a modulation of the electronic charges below a transition temperature T CDW (ref. 14). The modulation periodicity is usually associated with a nesting vector of the Fermi surface. Therefore, a gap opens in the electronic density of states (DOS) at F , N ( F ), below T CDW . In one-dimensional (1D) systems, for which such a transition was initially proposed, this effect changes the character of the system from metallic for T > T CDW to insulating for T < T CDW . In 2D or 3D systems, the gap opens only on a part of the Fermi surface and, therefore, the conductivity remains metallic below T CDW . The opening of the gap does, however, lead to a very characteristic upturn of the resistivity ρ(T ) at T CDW .Some CDW transitions can be tuned to a T = 0 critical point as well [15][16][17][18][19][20][21] . The appearance or a strengthening of a superconducting state is frequently found near the vanishing point of the CDW state, similar to magnetic QCPs. Yet, in this case, it can easily be explained within the standard BCS-based theories: the gap associated with the CDW closes at the critical point, resulting in an increase of N ( F ), which, in turn, leads to an increase of the SC transition temperature T c . As a consequence, the dependence of T c on the tuning parameter is usually rather weak in the non-CDW regime beyond the critical point 16,17,[20][21][22][23] . There is currently no clear evidence that quantum critical fluc...

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Section: Substituting Pd For Pt Suppressesmentioning

confidence: 99%

Section: Substituting Pd For Pt Suppressesmentioning

confidence: 99%

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Charge density wave quantum critical point with strong enhancement of superconductivity

et al. 2017

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“…ZrTe 3 is a material which shows the coexistence of a CDW at ~63 K and filamentary SC at 2 K11 as does NbSe 2 3. In the case of ZrTe 3 , by the application of pressure, intercalation of Cu12 and Ni13 or the substitution of Se at the Te site14, the CDW can be suppressed and bulk SC induced at ~5 K15. The electronic structure of ZrTe 3 is unique amongst the MQ 3 family owing to the strong contribution of the Te-Te p σ* band at the vicinity of the Fermi level16, therefore the inter-chain interactions affects the electronic structure as well as the physical properties.…”

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

Denholme

Yukawa

Tsumura

et al. 2017

Sci Rep

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We present the first experimental evidence for metallicity, superconductivity (SC) and the co-existence of charge density waves (CDW) in the quasi-one-dimensional material HfTe3. The existence of such phenomena is a typical characteristic of the transition metal chalcogenides however, without the application of hydrostatic pressure/chemical doping, it is rare for a material to exhibit the co-existence of both states. Materials such as HfTe3 can therefore provide us with a unique insight into the relationship between these multiple ordered states. By improving on the original synthesis conditions, we have successfully synthesised single phase HfTe3 and confirmed the resultant structure by performing Rietveld refinement. Using low temperature resistivity measurements, we provide the first experimental evidence of SC at ~1.4 K as well as a resistive anomaly indicative of a CDW formation at ~82 K. By the application of hydrostatic-pressure, the resistivity anomaly shifts to higher temperature. The results show that HfTe3 is a promising new material to help study the relationship between SC and CDW.

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“…T 2 coefficient of electrical resistivity A versus Sommerfield coefficient γ of specific heat of several systems. Experimental data beyond Cu x Bi 2 Se 3 was obtained from other literatures, including CDW materials [100,101], oxides [79,[102][103][104][105][106][107], A-15 superconductors [104], heavy fermions [75,107,108], transition metals [76].…”

Section: Discussionmentioning

confidence: 99%

Unconventional superconductivity in Cu_xBi₂Se₃ from magnetic susceptibility and electrical transport

Fang

You

2020

New J. Phys.

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Although the Cu doped Bi 2 Se 3 topological insulator was discovered and intensively studied for almost a decade, its electrical and magnetic properties in normal state, and the mechanism of 'high-T c ' superconductivity regarding the relatively low-carrier density are still not addressed yet. In this work, we report a systematic investigation of magnetic susceptibility, critical fields, and electrical transport on the nominal Cu 0.20 Bi 2 Se 3 single crystals with T onset c = 4.18 K, the highest so far. The composition analysis yields the Cu stoichiometry of x = 0.09(1). The magnetic susceptibility shows considerable anisotropy and an obvious kink at around 96 K was observed in the magnetic susceptibility for H c, which indicates a charge density anomaly. The electrical transport measurements indicate the two-dimensional (2D) Fermi liquid behavior at low temperatures with a high Kadowaki-Woods ratio, A/γ 2 = 30.3a 0 . The lower critical field at 0 K limit was extracted to be 6.0 Oe for H ab. In the clean limit, the ratio of energy gap to T c was determined to be Δ 0 /k B T c = 2.029 ± 0.124 exceeding the standard BCS value 1.764, suggesting Cu 0.09 Bi 2 Se 3 is a strong-coupling superconductor. The in-plane penetration depth at 0 K was calculated to be 1541.57 nm, resulting in an unprecedented high ratio of T c /λ −2 (0) ∼ = 9.86. Moreover, the ratio of T c to Fermi temperature is estimated to be T c /T 2D F = 0.034. Both ratios fall into the region of unconventional superconductivity according to Uemura's regime, supporting the unconventional superconducting mechanism in Cu x Bi 2 Se 3 . Finally, the enhanced T c value higher than 4 K is proposed to arise from the increased density of states at Fermi energy and strong electron-phonon interaction induced by the charge density instability. 1 K, such as SrTiO 3 (T c ∼ 0.05-0.29 K, n e = 0.65 to 42.4 × 10 20 cm −3 ) [3,4], GeTe (T c ∼ 0.07-0.3 K, n e = 8.6 to 15.2 × 10 20 cm −3 ) [5], and SnTe (T c ∼ 0.034-0.214 K, n p = 7.5 to 20.0 × 10 20 cm −3 ) [6]. To compare with these systems, the T c value of Cu x Bi 2 Se 3 is relatively 'high' given it is a highly doped narrow semiconductor with lower carrier density. However, the mechanism of such anomalous enhanced T c phenomenon remains unclear despite nearly a decade of extensive research. © 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft New J. Phys. 22 (2020) 053026 Y Fang et alThe emergence and enhancement of superconductivity may occur in various cases by tailoring the ground states of quantum materials. For example, suppression of charge density wave (CDW) by chemical doping or pressure is observed in many systems [7-10], including low dimensional layered Cu x TiSe 2 and three dimensional (3D) alloys Lu(Pt 1−x Pd x ) 2 In and (Sr, Ca) 3 Ir 4 Sn 13 , 3D oxides Ba 1−x K x BiO 3 . Similarly, the magnetic ordering or spin density wave (SDW) have also been suppressed in strongly correlated heavy fermions materials, high-T c cuprates and i...

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Superconductivity and Charge Density Wave in ZrTe3−xSex

Cited by 55 publications

References 35 publications

Charge density wave quantum critical point with strong enhancement of superconductivity

Charge density wave quantum critical point with strong enhancement of superconductivity

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

Unconventional superconductivity in Cu_xBi₂Se₃ from magnetic susceptibility and electrical transport

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Superconductivity and Charge Density Wave in ZrTe3−xSex

Cited by 55 publications

References 35 publications

Charge density wave quantum critical point with strong enhancement of superconductivity

Charge density wave quantum critical point with strong enhancement of superconductivity

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

Unconventional superconductivity in CuxBi2Se3 from magnetic susceptibility and electrical transport

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Unconventional superconductivity in Cu_xBi₂Se₃ from magnetic susceptibility and electrical transport