scholarly journals Wiedemann-Franz Law and Abrupt Change in Conductivity across the Pseudogap Critical Point of a Cuprate Superconductor

2018 ◽  
Vol 8 (4) ◽  
Author(s):  
B. Michon ◽  
A. Ataei ◽  
P. Bourgeois-Hope ◽  
C. Collignon ◽  
S. Y. Li ◽  
...  
Keyword(s):  
Critical Point ◽  
Abrupt Change ◽  
Cuprate Superconductor

scholarly journals Fermi-surface transformation across the pseudogap critical point of the cuprate superconductor La1.6−xNd0.4SrxCuO4

2017 ◽  
Vol 95 (22) ◽  
Author(s):  
C. Collignon ◽  
S. Badoux ◽  
S. A. A. Afshar ◽  
B. Michon ◽  
F. Laliberté ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Critical Point ◽  
Cuprate Superconductor ◽  
Surface Transformation

scholarly journals Divergent Nematic Susceptibility near the Pseudogap Critical Point in a Cuprate Superconductor

2020 ◽  
Vol 89 (6) ◽  
pp. 064707 ◽  
Author(s):  
Kousuke Ishida ◽  
Suguru Hosoi ◽  
Yuki Teramoto ◽  
Tomohiro Usui ◽  
Yuta Mizukami ◽  
...  
Keyword(s):  
Critical Point ◽  
Cuprate Superconductor

scholarly journals Abrupt change of the superconducting gap structure at the nematic critical point in FeSe1−xSx

2018 ◽  
Vol 115 (6) ◽  
pp. 1227-1231 ◽  
Author(s):  
Yuki Sato ◽  
Shigeru Kasahara ◽  
Tomoya Taniguchi ◽  
Xiangzhuo Xing ◽  
Yuichi Kasahara ◽  
...  
Keyword(s):  
Critical Point ◽  
Abrupt Change ◽  
Rotational Symmetry ◽  
Magnetic Ordering ◽  
Superconducting Gap ◽  
Strong Impact ◽  
Pairing Interaction ◽  
Nematic Order ◽  
Superconducting Pairing ◽  
Gap Structure

The emergence of the nematic electronic state that breaks rotational symmetry is one of the most fascinating properties of the iron-based superconductors, and has relevance to cuprates as well. FeSe has a unique ground state in which superconductivity coexists with a nematic order without long-range magnetic ordering, providing a significant opportunity to investigate the role of nematicity in the superconducting pairing interaction. Here, to reveal how the superconducting gap evolves with nematicity, we measure the thermal conductivity and specific heat of FeSe1 − xSx, in which the nematicity is suppressed by isoelectronic sulfur substitution and a nematic critical point (NCP) appears at xc≈0.17. We find that, in the whole nematic regime (0≤x≤0.17), the field dependence of two quantities consistently shows two-gap behavior; one gap is small but highly anisotropic with deep minima or line nodes, and the other is larger and more isotropic. In stark contrast, in the tetragonal regime (x=0.20), the larger gap becomes strongly anisotropic, demonstrating an abrupt change in the superconducting gap structure at the NCP. Near the NCP, charge fluctuations of dxz and dyz orbitals are enhanced equally in the tetragonal side, whereas they develop differently in the orthorhombic side. Our observation therefore directly implies that the orbital-dependent nature of the nematic fluctuations has a strong impact on the superconducting gap structure and hence on the pairing interaction.

scholarly journals Change of carrier density at the pseudogap critical point of a cuprate superconductor

Nature ◽  
2016 ◽  
Vol 531 (7593) ◽  
pp. 210-214 ◽  
Author(s):  
S. Badoux ◽  
W. Tabis ◽  
F. Laliberté ◽  
G. Grissonnanche ◽  
B. Vignolle ◽  
...  
Keyword(s):  
Critical Point ◽  
Carrier Density ◽  
Cuprate Superconductor

scholarly journals Hidden magnetism at the pseudogap critical point of a cuprate superconductor

2020 ◽  
Vol 16 (10) ◽  
pp. 1064-1068 ◽  
Author(s):  
Mehdi Frachet ◽  
Igor Vinograd ◽  
Rui Zhou ◽  
Siham Benhabib ◽  
Shangfei Wu ◽  
...  
Keyword(s):  
Critical Point ◽  
Cuprate Superconductor

scholarly journals Transport signatures of the pseudogap critical point in the cuprate superconductor Bi2Sr2−xLaxCuO6+δ

2021 ◽  
Vol 104 (1) ◽  
Author(s):  
M. Lizaire ◽  
A. Legros ◽  
A. Gourgout ◽  
S. Benhabib ◽  
S. Badoux ◽  
...  
Keyword(s):  
Critical Point ◽  
Cuprate Superconductor

The Critical Point Drying Method Applied to Scanning Electron Microscopy of L-929 Cells

1970 ◽  
Vol 28 ◽  
pp. 278-279
Author(s):  
Charles TurnbiLL ◽  
Delbert E. Philpott
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Surface Tension ◽  
Critical Point ◽  
Freeze Drying ◽  
Attractive Alternative ◽  
Crystal Formation ◽  
Critical Point Drying ◽  
Time Required ◽  
Scanning Electron

The advent of the scanning electron microscope (SCEM) has renewed interest in preparing specimens by avoiding the forces of surface tension. The present method of freeze drying by Boyde and Barger (1969) and Small and Marszalek (1969) does prevent surface tension but ice crystal formation and time required for pumping out the specimen to dryness has discouraged us. We believe an attractive alternative to freeze drying is the critical point method originated by Anderson (1951; for electron microscopy. He avoided surface tension effects during drying by first exchanging the specimen water with alcohol, amy L acetate and then with carbon dioxide. He then selected a specific temperature (36.5°C) and pressure (72 Atm.) at which carbon dioxide would pass from the liquid to the gaseous phase without the effect of surface tension This combination of temperature and, pressure is known as the "critical point" of the Liquid.

SEM Cold Stage Techniques for the Observation of Vegetative and Floral Apices of Oat (Avena sativa L.) Plants

1977 ◽  
Vol 35 ◽  
pp. 590-591
Author(s):  
B. K. Kirchoff ◽  
L.F. Allard ◽  
W.C. Bigelow
Keyword(s):  
Critical Point ◽  
Avena Sativa ◽  
Substantial Improvement ◽  
Fresh Tissue ◽  
Cold Stage ◽  
Critical Point Drying ◽  
Almost All ◽  
Cell Collapse ◽  
Conductive Paint ◽  
Carbon Based

In attempting to use the SEM to investigate the transition from the vegetative to the floral state in oat (Avena sativa L.) it was discovered that the procedures of fixation and critical point drying (CPD), and fresh tissue examination of the specimens gave unsatisfactory results. In most cases, by using these techniques, cells of the tissue were collapsed or otherwise visibly distorted. Figure 1 shows the results of fixation with 4.5% formaldehyde-gluteraldehyde followed by CPD. Almost all cellular detail has been obscured by the resulting shrinkage distortions. The larger cracks seen on the left of the picture may be due to dissection damage, rather than CPD. The results of observation of fresh tissue are seen in Fig. 2. Although there is a substantial improvement over CPD, some cell collapse still occurs.Due to these difficulties, it was decided to experiment with cold stage techniques. The specimens to be observed were dissected out and attached to the sample stub using a carbon based conductive paint in acetone.

The Effects of Drying Techniques on Clay-Rich Soil Texture

1974 ◽  
Vol 32 ◽  
pp. 466-467
Author(s):  
T. G. Naymik
Keyword(s):  
Critical Point ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Drying Methods ◽  
Air Drying ◽  
Freeze Dried ◽  
Critical Point Drying ◽  
Set Up ◽  
The Relationship ◽  
Quartz Grains

Three techniques were incorporated for drying clay-rich specimens: air-drying, freeze-drying and critical point drying. In air-drying, the specimens were set out for several days to dry or were placed in an oven (80°F) for several hours. The freeze-dried specimens were frozen by immersion in liquid nitrogen or in isopentane at near liquid nitrogen temperature and then were immediately placed in the freeze-dry vacuum chamber. The critical point specimens were molded in agar immediately after sampling. When the agar had set up the dehydration series, water-alcohol-amyl acetate-CO2 was carried out. The objectives were to compare the fabric plasmas (clays and precipitates), fabricskeletons (quartz grains) and the relationship between them for each drying technique. The three drying methods are not only applicable to the study of treated soils, but can be incorporated into all SEM clay soil studies.

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