An unusual material hosts both even and odd superconducting phases

Physics Today ◽  
2021 ◽  
Vol 74 (11) ◽  
pp. 19-21
Author(s):  
Heather M. Hill
Keyword(s):  
Superconducting Phases

Intergrowth of modulated structures in high Tc Bi-Sr-Ca-Cu-O superconductors

1990 ◽  
Vol 48 (4) ◽  
pp. 76-77
Author(s):  
A.Q. He ◽  
G.W. Qiao ◽  
J. Zhu ◽  
H.Q. Ye
Keyword(s):  
Twin Structure ◽  
Modulated Structure ◽  
High Tc ◽  
One Dimensional ◽  
Lattice Constants ◽  
Superconducting Phases ◽  
Modulated Structures ◽  
Layer Structures

Since the first discovery of high Tc Bi-Sr-Ca-Cu-O superconductor by Maeda et al, many EM works have been done on it. The results show that the superconducting phases have a type of ordered layer structures similar to that in Y-Ba-Cu-O system formulated in Bi2Sr2Can−1CunO2n+4 (n=1,2,3) (simply called 22(n-1) phase) with lattice constants of a=0.358, b=0.382nm but the length of c being different according to the different value of n in the formulate. Unlike the twin structure observed in the Y-Ba-Cu-O system, there is an incommensurate modulated structure in the superconducting phases of Bi system superconductors. Modulated wavelengths of both 1.3 and 2.7 nm have been observed in the 2212 phase. This communication mainly presents the intergrowth of these two kinds of one-dimensional modulated structures in 2212 phase.

Transmission Electron Microscopy study of Bi-based superconducting phases

1990 ◽  
Vol 48 (4) ◽  
pp. 50-51
Author(s):  
J.G. Wen ◽  
K.K. Fung
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Single Crystals ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Space Groups ◽  
Superconducting Phases ◽  
Ceramic Samples ◽  
Transmission Electron ◽  
Modulated Structures

Bi-based superconducting phases have been found to be members of a structural series represented by Bi2Sr2Can−1Cun−1On+4, n=1,2,3, and are referred to as 2201, 2212, 2223 phases. All these phases are incommensurate modulated structures. The super space groups are P2/b, NBbmb 2201, 2212 phases respectively. Pb-doped ceramic samples and single crystals and Y-doped single crystals have been studied by transmission electron microscopy.Modulated structures of all Bi-based superconducting phases are in b-c plane, therefore, it is the best way to determine modulated structure and c parameter in diffraction pattern. FIG. 1,2,3 show diffraction patterns of three kinds of modulations in Pb-doped ceramic samples. Energy dispersive X-ray analysis (EDAX) confirms the presence of Pb in the three modulated structures. Parameters c are 3 0.06, 38.29, 30.24Å, ie 2212, 2223, 2212 phases for FIG. 1,2,3 respectively. Their average space groups are all Bbmb.

Structural modifications of the superconducting phases on Bi system by electron beam irradiation

1996 ◽  
Vol 9 (3) ◽  
pp. 273-276 ◽  
Author(s):  
G. Aldica ◽  
I. I. Geru ◽  
B. M. Puscasu ◽  
F. Constantinescu ◽  
P. Badica
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Structural Modifications ◽  
Superconducting Phases

Stabilization of new superconducting phases by low temperature flourination of La2CuO4-derived oxides

1991 ◽  
Vol 185-189 ◽  
pp. 583-584 ◽  
Author(s):  
A. Tressaud ◽  
B. Chevalier ◽  
C. Robin ◽  
E. Hickey ◽  
J. Etourneau
Keyword(s):  
Low Temperature ◽  
Superconducting Phases

Identification of superconducting phases in the Ba-Ca-Cu-O system: an unstable phase with Tc≈126 K and its derivative with Tc≈90 K

1999 ◽  
Vol 9 (5) ◽  
pp. 1141-1148 ◽  
Author(s):  
T. Hosomi ◽  
H. Suematsu ◽  
H. Fjellvåg ◽  
M. Karppinen ◽  
H. Yamauchi
Keyword(s):  
Superconducting Phases ◽  
Unstable Phase

Stability of superconducting phases in Bi-Sr-Ca-Cu-O and the role of Pb doping

1989 ◽  
Vol 40 (7) ◽  
pp. 5266-5269 ◽  
Author(s):  
S. X. Dou ◽  
H. K. Liu ◽  
A. J. Bourdillon ◽  
M. Kviz ◽  
N. X. Tan ◽  
...  
Keyword(s):  
Superconducting Phases ◽  
Pb Doping

scholarly journals Superconducting Phases of Phosphorus Hydride Under Pressure: Stabilization by Mobile Molecular Hydrogen

2017 ◽  
Vol 129 (34) ◽  
pp. 10326-10329 ◽  
Author(s):  
Tiange Bi ◽  
Daniel P. Miller ◽  
Andrew Shamp ◽  
Eva Zurek
Keyword(s):  
Molecular Hydrogen ◽  
Superconducting Phases ◽  
Pressure Stabilization

Ultrasonic study of the superconducting phases in heavy fermion compounds

1990 ◽  
Vol 165-166 ◽  
pp. 369-370 ◽  
Author(s):  
G.J.C.L. Bruls ◽  
D. Weber ◽  
B. Wolf ◽  
B. Luthi ◽  
A.A. Menovsky ◽  
...  
Keyword(s):  
Heavy Fermion ◽  
Ultrasonic Study ◽  
Superconducting Phases

Multiple Superconducting Phases in UTe2: A Complex Analogy to Superfluid Phases of 3He

2021 ◽  
Vol 1 ◽  
Author(s):  
Shinsaku Kambe ◽  
Keyword(s):  
Phase Diagram ◽  
Physical Properties ◽  
Low Temperatures ◽  
Quantum Statistics ◽  
Superconducting Phases ◽  
Fermion Systems ◽  
Quantum Liquids ◽  
Wave Symmetry ◽  
Ferromagnetic Interactions ◽  
Ordered State

In quantum liquids, large differences are observed owing to differences in quantum statistics. The physical properties of liquid <sup>3</sup>He (Fermion) and <sup>4</sup>He (Boson) are considerably different at low temperatures. After the discovery of superconductivity in electron (i.e., Fermion) systems, a similar pairing ordered state was expected for <sup>3</sup>He. Remarkably, the observed ordered state of <sup>3</sup>He was more surprising than expected, multiple superfluid phases in the <em>T-P</em> phase diagram. The origin of the multiple phases was attributed to ferromagnetic interactions in the <em>p</em>-wave symmetry state.

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