Charge density wave modulation and gap measurements in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CeTe</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Ralević, Uroš; Lazarević, N.; Baum, Andreas; Eiter, H.-M.; Hackl, R.; Giraldo-Gallo, P.; Fisher, I. R.; Petrović, C.; Gajić, Radoš; Popović, Zoran S.

doi:10.1103/physrevb.94.165132

Cited by 15 publications

(10 citation statements)

References 36 publications

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“…1d), a depletion of the electronic background develops in the E 2g symmetry below T ICDW . This loss of spectral weight at low energy is attributed to the opening of a gap in the CDW state, similarly to what has been observed in rare-earth tellurides prototopical CDW systems [45,46]. The gap extends up to at least ∆=400 cm −1 .…”

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confidence: 73%

Pressure-Induced Collapse of the Charge Density Wave and Higgs Mode Visibility in 2H−TaS2

et al. 2019

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The pressure evolution of the Raman active electronic excitations of the transition metal dichalcogenides 2H-TaS2 is followed through the pressure phase diagram embedding incommensurate chargedensity-wave and superconducting states. At high pressure, the charge-density-wave is found to collapse at 8.5 GPa. In the coexisting charge-density-wave and superconducting orders, we unravel a strong in-gap superconducting mode, attributed to a Higgs mode, coexisting with the expected incoherent Cooper-pair breaking signature. The latter remains in the pure superconducting state reached above 8.5 GPa. Our report constitutes the first observation of such Raman active Higgs mode since the longstanding unique case 2H-NbSe2.

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supporting

confidence: 73%

Pressure-Induced Collapse of the Charge Density Wave and Higgs Mode Visibility in 2H−TaS2

et al. 2019

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“…Moreover, we find that the magnitude of ∆ CDW (p) and of ∆ SC (p) are comparable over a significant doping range, which is consistent with a concept that has gained importance in recent times, namely the presence of an emergent approximate symmetry that links CDW, which is a particle-hole instability, with superconductivity, which is an instability involving particle-particle excitations. This symmetry is exact only at the so called "hot spots" of the Fermi surface [4][5][6][7][8][9].A typical signature of a density wave in Raman spectroscopy is the loss of spectral weight of the electronic continuum at low energy, followed by a recovery of spectral weight at higher energy, as the order sets in as a function of temperature [20]. In the cuprates, however, since T CDW < T * , the characteristic PG temperature, one technical challenge is to distinguish CDW from the loss of spectral weight due to the PG itself [21].…”

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confidence: 99%

Intimate link between charge density wave, pseudogap and superconducting energy scales in cuprates

et al. 2019

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The cuprate high temperature superconductors develop spontaneous charge density wave (CDW) order below a temperature T CDW and over a wide range of hole doping (p). An outstanding challenge in the field is to understand whether this modulated phase is related to the more exhaustively studied pseudogap and superconducting phases [1,2]. To address this issue it is important to extract the energy scale ∆ CDW associated with the charge modulations, and to compare it with the pseudogap (PG) ∆ PG and the superconducting gap ∆ SC . However, while T CDW is well-characterized from earlier works [3] little has been known about ∆ CDW until now. Here, we report the extraction of ∆ CDW for several cuprates using electronic Raman spectroscopy.Crucially, we find that, upon approaching the parent Mott state by lowering p, ∆ CDW increases in a manner similar to the doping dependence of ∆ PG and ∆ SC . This shows that CDW is an unconventional order, and that the above three phases are controlled by the same electronic correlations. In addition, we find that ∆ CDW ≈ ∆ SC over a substantial doping range, which is suggestive of an approximate emergent symmetry connecting the charge modulated phase with superconductivity [4][5][6][7][8][9].In recent years, many experiments and different techniques have established the ubiquity of CDW order in cuprates [3]. In particular, these works have determined T CDW (p), which displays a dome-like shape on the temperature-doping (T − p) phase diagram, in a fashion reminiscent of the superconducting dome T SC (p), even though the former order is present over a much narrower p-range, and mostly below optimal doping. The CDW is found to compete with superconductivity [10-16] but there are indications that the interplay between the two phenomena might be more complex than a simple competition [17,18].The energy scale ∆ CDW associated with the CDW has attracted far less experimental attention, even though this quantity is crucial to address several important ques-tions such as the following. (a) First, whether the CDW is a conventional order i.e., a phase whose existence can be understood within a scenario of weakly interacting electrons. A tell-tale signature of it would be if T CDW (p) ∝ ∆ CDW (p). On the other hand if their doping trends are different, as is famously the case of the superconducting order, it implies unconventional order, which is a consequence of strongly interacting electrons.Here we show that this is also the case of the CDW and, therefore, it is an unconventional order. (b) Second, a comparison of the magnitudes and the doping dependencies of ∆ CDW (p), ∆ SC (p) and ∆ PG (p) is important to understand the relation between these three phenomena. We show that these three energy scales have rather similar doping evolutions, implying that it is likely that they have a common origin in terms of a driving electronic interaction. Moreover, we find that the magnitude of ∆ CDW (p) and of ∆ SC (p) are comparable over a significant doping range, which is consistent with a concept that has ...

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“…Wird vor dem Wechsel der Bestrahlungswellenlänge ein neues Abfangreagens zugegeben, gelingt die kontrollierte sequenzielle Substitution mit zwei verschiedenen Substituenten in einem Reaktionsgefäß (Schema 1, sequenzielle Substitutionen). Das kommerziell verfügbare 2,4,6-Tribrompyrimidin mit einer Grundstruktur, die auch in einigen biologisch aktiven Verbindungen oder Medikamenten [23] zu finden ist, wurde selektiv in Abhängigkeit von der Lichtfarbe funktionalisiert. Durch Kontrollexperimente wurde zudem bestätigt, dass Rh-6G,D IPEA und Belichtung notwendig sind, damit die katalytische C-H-Arylierung abläuft (siehe Tabellen SI-S1 und SI-S2 in den Hintergrundinformationen).…”

Section: Die Selektive Aktivierung Von Bindungen In Chemischenunclassified

Farbselektive Photokatalyse: kontrollierte Bindungsaktivierung durch Redoxpotentialregulation über die Anregungslichtfarbe

Ghosh

König

2016

Angewandte Chemie

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Charge density wave modulation and gap measurements inCeTe3

Cited by 15 publications

References 36 publications

Pressure-Induced Collapse of the Charge Density Wave and Higgs Mode Visibility in 2H−TaS2

Pressure-Induced Collapse of the Charge Density Wave and Higgs Mode Visibility in 2H−TaS2

Intimate link between charge density wave, pseudogap and superconducting energy scales in cuprates

Farbselektive Photokatalyse: kontrollierte Bindungsaktivierung durch Redoxpotentialregulation über die Anregungslichtfarbe

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