Pair-breaking effect due to the long-range antiferromagnetic order in high-Tc superconductors RE123 (RE=Dy, Gd)

2004 ◽  
Vol 408-410 ◽  
pp. 392-393
Author(s):  
Krzysztof Rogacki
Keyword(s):  
Long Range ◽  
Antiferromagnetic Order ◽  
Pair Breaking ◽  
High Tc Superconductors ◽  
Breaking Effect ◽  
High Tc

Pair-breaking effect in the substitution for Cu in high Tc copper oxides

1992 ◽  
Vol 81 (11) ◽  
pp. 923-928 ◽  
Author(s):  
Yoshiko Oi Nakamura ◽  
Naoya Matsuda ◽  
Yasushi Shiina
Keyword(s):  
Copper Oxides ◽  
Pair Breaking ◽  
Breaking Effect ◽  
High Tc

Long-range-order correlations in isotropic systems: HT phase diagram of polycrystalline high Tc superconductors

1994 ◽  
Vol 235-240 ◽  
pp. 2639-2640
Author(s):  
R. Decca ◽  
D. López ◽  
F. de la Cruz ◽  
C.J.R. González Oliber
Keyword(s):  
Phase Diagram ◽  
Long Range ◽  
Range Order ◽  
Long Range Order ◽  
High Tc Superconductors ◽  
High Tc ◽  
T Phase

Local density of states of high-Tc superconductors with long-range Coulomb interaction

2010 ◽  
Vol 374 (15-16) ◽  
pp. 1779-1783
Author(s):  
Hong-Wei Zhao ◽  
Hao Meng ◽  
Ling-feng Zhang ◽  
Lin Wen ◽  
Liang-ma Shi ◽  
...  
Keyword(s):  
Long Range ◽  
Coulomb Interaction ◽  
Density Of States ◽  
Local Density ◽  
Local Density Of States ◽  
High Tc Superconductors ◽  
High Tc

OFF-DIAGONAL LONG RANGE ORDER IN AN ELECTRON-PHONON MODEL FOR HIGH-Tc SUPERCONDUCTORS

1992 ◽  
Vol 03 (01) ◽  
pp. 105-120 ◽  
Author(s):  
M. Frick ◽  
I. Morgenstern ◽  
W.von der Linden
Keyword(s):  
Long Range ◽  
Quantum Monte Carlo ◽  
Range Order ◽  
Long Range Order ◽  
Superconducting Properties ◽  
High Tc Superconductors ◽  
High Tc ◽  
Electronic Correlations ◽  
Superconducting Condensate ◽  
Phonon Model

We study a model for high- T c superconductors describing both the strong electronic correlations and a coupling of the carriers to anharmonic phonons. The Projector Quantum Monte Carlo Scheme has been employed to investigate ground state properties. We analyze the superconducting properties of the model by directly addressing to the existence of Off-Diagonal Long Range Order (ODLRO). We review the numerical algorithm and discuss the possibility to observe ODLRO. In the presented model, we find ODLRO pointing towards superconductivity instead of the presence of strong electronic correlations. We discuss several features of the superconducting condensate.

The many faces of STEM in materials science

1991 ◽  
Vol 49 ◽  
pp. 440-441
Author(s):  
John Silcox
Keyword(s):  
Materials Science ◽  
Auger Spectroscopy ◽  
Dark Field ◽  
High Tc Superconductors ◽  
High Tc ◽  
Acoustic Environment ◽  
Electromagnetic Vibration ◽  
The Many ◽  
Serial Mode

Determination of the microstructure and microchemistry of small features often provides the insight needed for the understanding of processes in real materials. In many cases, it is not adequate to use microscopy alone. Microdiffraction and microspectroscopic information such as EELS, X-ray microprobe analysis and Auger spectroscopy can all contribute vital parts of the picture. For a number of reasons, dedicated STEM offers considerable promise as a quantitative instrument. In this paper, we review progress towards effective quantitative use of STEM with illustrations drawn from studies of high Tc superconductors, compound semiconductors and metallization of H-terminated silicon.Intrinsically, STEM is a quantitative instrument. Images are acquired directly by detectors in serial mode which is particularly convenient for digital image acquisition, control and display. The VG HB501A at Cornell has been installed in a particularly stable electromagnetic, vibration and acoustic environment. Care has been paid to achieving UHV conditions (i.e., 10-10 Torr). Finally, it has been interfaced with a VAX 3200 work station by Kirkland. This permits, for example, the acquisition of bright field (or energy loss) images and dark field images simultaneously as quantitative arrays in perfect registration.

Crystal chemistry of high-Tc superconductors

1990 ◽  
Vol 48 (4) ◽  
pp. 1118-1119
Author(s):  
Maryvonne Hervieu
Keyword(s):  
Oxygen Deficiency ◽  
Large Family ◽  
Copper Oxides ◽  
High Tc Superconductors ◽  
High Tc ◽  
Single Mechanism ◽  
Square Planar ◽  
History Of ◽  
Bismuth Cuprates ◽  
New Compounds

Four years after the discovery of superconductivity at high temperature in the Ba-La-Cu-O system, more than thirty new compounds have been synthesized, which can be classified in six series of copper oxides: La2CuO4 - type oxides, bismuth cuprates, YBa2Cu3O7 family, thallium cuprates, lead cuprates and Nd2CuO4 - type oxides. Despite their quite different specific natures, close relationships allow their structures to be simply described through a single mechanism. The fifth first families can indeed be described as intergrowths of multiple oxygen deficient perovskite slabs with multiple rock salt-type slabs, according to the representation [ACuO3-x]m [AO]n.The n and m values are integer in the parent structures, n varying from 0 to 3 and m from 1 to 4; every member of this large family can thus be symbolized by [m,n]. The oxygen deficient character of the perovskite slabs involves the existence or the co-existence of several types of copper environment: octahedral, pyramidal and square planar.Both mechanisms, oxygen deficiency and intergrowth, are well known to give rise easily to nonstoichiometry phenomena. Numerous and various phenomena have actually been characterized in these cuprates, strongly depending on the thermal history of the samples.

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