Crystal Growth and Characterization of HgBa2Ca2Cu3O8+δ Superconductors with the Highest Critical Temperature at Ambient Pressure

Loret, B.; Forget, A.; Moussy, Jean-Baptiste; Poissonnet, S.; Bonnaillie, Patrick; Collin, G.; Thuéry, Pierre; Sacuto, A.; Colson, D.

doi:10.1021/acs.inorgchem.7b01372

Cited by 16 publications

(18 citation statements)

References 29 publications

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“…We performed electronic Raman scattering measurements on Hg-1223 single crystals grown with a single step synthesis [26]. Given the positive results in Hg-1223 (see below), we also measured single crystals from the HgBa 2 CuO 4+δ (Hg-1201) and the YBa 2 Cu 3 0 7−δ (Y-123) families in order to demonstrate that the CDW signature in Raman response is present in several types of cuprates.…”

Section: Cdwmentioning

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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Section: Cdwmentioning

confidence: 99%

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

et al. 2019

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“…According to the refs. [25,28,48,49,58,81], the ∆c ∆Tc (P ) ratio is approximately one order of magnitude larger than the ∆c ∆Tc (p) . Our estimate is ∆c ∆Tc (P ) ≈ 10 −2 ÅK −1 and ∆c ∆Tc (p) < 10 −3 ÅK −1 .…”

Section: Overview Of the Superconducting And Normal Raman Responses O...mentioning

confidence: 85%

“…Fig. 7) while it softens with doping [48,49,62,63]. Its softening is due to its coupling with charge carriers which increases with doping [75][76][77] and is a common feature of many cuprates such as Hg-1201, Y-123 and Hg-1223 [48,49,62,[78][79][80].…”

Section: Overview Of the Superconducting And Normal Raman Responses O...mentioning

confidence: 99%

“…The crystals used for Raman measurements under hydrostatic pressure were prepared close to the optimal doping where the SC transition temperature T c is maximum. The Hg-1201 and Hg-1223 single crystals were synthesized and annealed following the method described in [48] and [49] respectively. We sieved the batch immediately after annealing, in order to select crystals between 100 and 200 µm in size.…”

Section: A Crystal Growth and Characterizationmentioning

confidence: 99%

“…7) while it softens with doping [48,49,62,63]. Its softening is due to its coupling with charge carriers which increases with doping [75][76][77] and is a common feature of many cuprates such as Hg-1201, Y-123 and Hg-1223 [48,49,62,[78][79][80]. On the other hand, its hardening with pressure is likely due to the inter-plane contraction along the c axis [58,81] which is much stronger with pressure than with doping.…”

Section: Overview Of the Superconducting And Normal Raman Responses O...mentioning

confidence: 99%

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Exploration of the Hg-based cuprate superconductors by Raman spectroscopy under hydrostatic pressure

Auvray,

Loret,

Chibani

et al. 2021

Preprint

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The superconducting phase of the HgBa 2 CuO 4+δ (Hg-1201) and HgBa 2 Ca2Cu3O 8+δ (Hg-1223) cuprates has been investigated by Raman spectroscopy under hydrostatic pressure. Our analysis reveals that the increase of Tc with pressure is slower in Hg-1223 cuprate compared to the Hg-1201 due to a charge carrier concentration imbalance accentuated by pressure in Hg-1223. We find that the energy variation under pressure of the apical oxygen mode from which the charge carriers are transferred to the CuO2 layer, is the same for both the Hg-1223 and Hg-1223 cuprates and it is controlled by the inter-layer compressibility. At last, we show that the binding energy of the Cooper pairs related to the maximum amplitude of the d− wave superconducting gap at the anti-nodes, does not follow Tc with pressure. It decreases while Tc increases. In the particular case of Hg-1201, the binding energy collapses from 10 to 2 KBTc as the pressure increases up to 10 GPa. These direct spectroscopic observations joined to the fact that the binding energy of the Cooper pairs at the anti-nodes does not follow Tc either with doping, raises the question of its link with the pseudogap energy scale which follows the same trend with doping.

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Synthesis and physical properties of (Pb0.5M0.5)(Sr,La)2CuO (z∼5; M = Fe, Co, Cu, and Zn)

Nakano

Maeda

Fujita

et al. 2023

Journal of Alloys and Compounds

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Crystal Growth and Characterization of HgBa₂Ca₂Cu₃O_8+δ Superconductors with the Highest Critical Temperature at Ambient Pressure

Cited by 16 publications

References 29 publications

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

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

Exploration of the Hg-based cuprate superconductors by Raman spectroscopy under hydrostatic pressure

Synthesis and physical properties of (Pb0.5M0.5)(Sr,La)2CuO (z∼5; M = Fe, Co, Cu, and Zn)

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