scholarly journals High-Tc superconducting detector for highly-sensitive microwave magnetometry

2019 ◽  
Vol 114 (19) ◽  
pp. 192602 ◽  
Author(s):  
François Couëdo ◽  
Eliana Recoba Pawlowski ◽  
Julien Kermorvant ◽  
Juan Trastoy ◽  
Denis Crété ◽  
...  
Keyword(s):  
Superconducting Detector ◽  
High Tc ◽  
Highly Sensitive

Highly sensitive open-flat coil magnetometer for the λ(H,T) measurements in plate-like high-Tc cuprates

2000 ◽  
Vol 71 (3) ◽  
pp. 1488-1494 ◽  
Author(s):  
S. G. Gevorgyan ◽  
T. Kiss ◽  
A. A. Movsisyan ◽  
H. G. Shirinyan ◽  
Y. Hanayama ◽  
...  
Keyword(s):  
High Tc ◽  
Highly Sensitive ◽  
High Tc Cuprates

Electron Phase Microscopy of Magnetic Fields in Ferromagnets and Superconductors

2011 ◽  
Vol 1318 ◽  
Author(s):  
Akira Tonomura
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Colossal Magnetoresistance ◽  
Layer Plane ◽  
Perpendicular Recording ◽  
High Tc ◽  
Phase Microscopy ◽  
Highly Sensitive ◽  
Aharonov Bohm ◽  
The Magnetic Field

ABSTRACTHighly sensitive electron phase microscopy based on the Aharonov-Bohm (AB) effect principle has been used to observe microscopic distributions of magnetic fields in ferromagnets and superconductors. The observation examples include the unconventional behaviors of interlayer Josephson vortices in anisotropic layered high-Tc superconducting YBa2Cu3O7-δ (YBCO) thin films, which are produced when the applied magnetic field is greatly tilted to the layer plane, and the magnetic-field distributions of tiny magnetic heads for perpendicular recording and of colossal magnetoresistance (CMR) materials.

SOME THERMAL AND ELECTRICAL PROPERTIES OF THE HIGH-Tc SUPERCONDUCTORS Y-Ba-Cu AND Bi-Sr-Ca-Cu OXIDES

1988 ◽  
Vol 02 (06) ◽  
pp. 1387-1393 ◽  
Author(s):  
S. J. COLLOCOTT ◽  
C. ANDRIKIDIS ◽  
R. DRIVER ◽  
G. K. WHITE
Keyword(s):  
Magnetic Field ◽  
Heat Capacity ◽  
Electrical Properties ◽  
Electrical Resistance ◽  
Upper Critical Field ◽  
Thermal Expansivity ◽  
High Tc Superconductors ◽  
High Tc ◽  
Highly Sensitive ◽  
Thermal And Electrical Properties

The heat capacity, Cp, has been measured in the range 0.4 to 20 K and the linear thermal expansivity, α, in the range 2 to 283 K of YBa 2 Cu 3 O 7. Below 4 K Cp exhibits a T-term (≈ 7.5 T mJ/mol.K ), but in general both Cp(T) and α(T) have magnitudes and T-dependences that are not very different from other ceramics. The electrical resistance of YBa 2 Cu 3 O 7 and Bi 2 Sr 1.7 CaCu 2 O 8 samples have been measured in the range 20 to 120 K and in magnetic fields of up to 7 T. In all cases the value of T c is highly sensitive to the applied magnetic field. The upper critical field, B c2 (0), is estimated to be 68.5 T for YBa 2 Cu 3 O 7 and 55 T for Bi 2 Sr 1.7 CaCu 2 O 8.

scholarly journals Electron Momentum Density: Recent Progress and Perspective for Combined Studies

2014 ◽  
Vol 70 (a1) ◽  
pp. C1549-C1549
Author(s):  
Yoshiharu Sakurai
Keyword(s):  
Compton Scattering ◽  
Momentum Density ◽  
Superconducting Transition ◽  
High Tc ◽  
Electron Momentum ◽  
Electron Momentum Density ◽  
X Ray ◽  
Highly Sensitive ◽  
High Tc Cuprates ◽  
Insight Into

Quantum mechanical descriptions are becoming a focus of attention in understanding the behavior of wide classes of materials. This paper discusses some of our recent works related to charge or magnetic Compton scattering studies. Selected topics include: (1) Quantum modelling of doped holes in high-Tc cuprates [1], which provides insight into the dome-shaped doping dependence of the superconducting transition temperature. (2) Analyses of Compton scattering X-ray spectra in spin-crossover cobaltates, which allows us to delineate the t2g-eg physics and quantum chemistry from the temperature evolution of electron momentum density. As a conclusion remark, we show an example of combined studies [2] and present its perspective, emphasizing that X-ray Compton scattering is highly sensitive to delocalized or itinerant electrons.

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

Fluorescence ratio imaging of dynamic intracellular ionic signals

1988 ◽  
Vol 46 ◽  
pp. 42-43
Author(s):  
R. Y. Tsien ◽  
A. Minta ◽  
M. Poenie ◽  
J.P.Y. Kao ◽  
A. Harootunian
Keyword(s):  
Binding Sites ◽  
Living Cells ◽  
Molecular Engineering ◽  
Ph Indicators ◽  
Highly Sensitive ◽  
Fluorescence Ratio Imaging ◽  
Ratio Imaging ◽  
Technical Advances ◽  
Indicator Dyes ◽  
Fluorescein Dyes

Recent technical advances now enable the continuous imaging of important ionic signals inside individual living cells with micron spatial resolution and subsecond time resolution. This methodology relies on the molecular engineering of indicator dyes whose fluorescence is strong and highly sensitive to ions such as Ca2+, H+, or Na+, or Mg2+. The Ca2+ indicators, exemplified by fura-2 and indo-1, derive their high affinity (Kd near 200 nM) and selectivity for Ca2+ to a versatile tetracarboxylate binding site3 modeled on and isosteric with the well known chelator EGTA. The most commonly used pH indicators are fluorescein dyes (such as BCECF) modified to adjust their pKa's and improve their retention inside cells. Na+ indicators are crown ethers with cavity sizes chosen to select Na+ over K+: Mg2+ indicators use tricarboxylate binding sites truncated from those of the Ca2+ chelators, resulting in a more compact arrangement of carboxylates to suit the smaller ion.

High resolution STEM imaging study on high Tc superconductor YBa2CuaO7-x

1988 ◽  
Vol 46 ◽  
pp. 882-883
Author(s):  
H.-J. Ou ◽  
J. M. Cowley
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Grain Boundary ◽  
Strong Field ◽  
Imaging Study ◽  
Structure Defects ◽  
High Tc ◽  
High Tc Superconductor ◽  
Diffraction Patterns ◽  
Lattice Planes

Using the dedicate VG-HB5 STEM microscope, the crystal structure of high Tc superconductor of YBa2Cu3O7-x has been studied via high resolution STEM (HRSTEM) imaging and nanobeam (∽3A) diffraction patterns. Figure 1(a) and 2(a) illustrate the HRSTEM image taken at 10' times magnification along [001] direction and [100] direction, respectively. In figure 1(a), a grain boundary with strong field contrast is seen between two crystal regions A and B. The grain boundary appears to be parallel to a (110) plane, although it is not possible to determine [100] and [001] axes as it is in other regions which contain twin planes [3]. Following the horizontal lattice lines, from left to right across the grain boundary, a lattice bending of ∽4° is noticed. Three extra lattice planes, indicated by arrows, were found to terminate at the grain boundary and form dislocations. It is believed that due to different chemical composition, such structure defects occur during crystal growth. No bending is observed along the vertical lattice lines.

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