scholarly journals Tuning from failed superconductor to failed insulator with magnetic field

2019 ◽  
Vol 5 (6) ◽  
pp. eaav7686 ◽  
Author(s):  
Yangmu Li ◽  
J. Terzic ◽  
P. G. Baity ◽  
Dragana Popović ◽  
G. D. Gu ◽  
...  
Keyword(s):  
Theoretical Perspective ◽  
Three Dimensional ◽  
Oxide Superconductors ◽  
Pairing Mechanism ◽  
Spin Correlations ◽  
Electron Pairing ◽  
Copper Oxide Superconductors ◽  
Charge Modulations ◽  
Antiferromagnetic Spin ◽  
Local Segregation

Do charge modulations compete with electron pairing in high-temperature copper oxide superconductors? We investigated this question by suppressing superconductivity in a stripe-ordered cuprate compound at low temperature with high magnetic fields. With increasing field, loss of three-dimensional superconducting order is followed by reentrant two-dimensional superconductivity and then an ultraquantum metal phase. Circumstantial evidence suggests that the latter state is bosonic and associated with the charge stripes. These results provide experimental support to the theoretical perspective that local segregation of doped holes and antiferromagnetic spin correlations underlies the electron-pairing mechanism in cuprates.

Link between spin fluctuations and electron pairing in copper oxide superconductors

Nature ◽  
2011 ◽  
Vol 476 (7358) ◽  
pp. 73-75 ◽  
Author(s):  
K. Jin ◽  
N. P. Butch ◽  
K. Kirshenbaum ◽  
J. Paglione ◽  
R. L. Greene
Keyword(s):  
Copper Oxide ◽  
Spin Fluctuations ◽  
Oxide Superconductors ◽  
Electron Pairing ◽  
Copper Oxide Superconductors

SIMPLE SPIN-HOLE MODEL FOR MAGNETIC CORRELATIONS IN COPPER-OXIDE SUPERCONDUCTORS

1988 ◽  
Vol 02 (05) ◽  
pp. 763-770 ◽  
Author(s):  
A. Robledo ◽  
C. Varea
Keyword(s):  
Simple Model ◽  
Copper Oxide ◽  
Phase Diagrams ◽  
Oxide Superconductors ◽  
Long Range Order ◽  
Spin Correlations ◽  
Weakly Coupled ◽  
Ferromagnetic Character ◽  
Copper Oxide Superconductors ◽  
Hole Model

A simple model of spins and holes for weakly coupled CuO 2 layers is constructed to study the temperature-concentration phase diagrams of doped La 2 CuO 4 and YBa 2 Cu 3 O 6. Addition of holes, localized on the O sites, induces a transformation of spin correlations similar to that produced in an antiferromagnet when it is diluted with ferromagnetic impurities. The insulator-metal (I-M) transition occurs when the correlations in the paramagnetic phase switch from antiferromagnetic to ferromagnetic character and the correlation length vanishes. Repulsions between holes inhibit or suppress the appearance of ferromagnetic long-range order.

scholarly journals Three-dimensional collective charge excitations in electron-doped copper oxide superconductors

Nature ◽  
2018 ◽  
Vol 563 (7731) ◽  
pp. 374-378 ◽  
Author(s):  
M. Hepting ◽  
L. Chaix ◽  
E. W. Huang ◽  
R. Fumagalli ◽  
Y. Y. Peng ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Three Dimensional ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors

Identifying the Pairing Mechanism in High-Tc Superconductors

1989 ◽  
Vol 156 ◽  
Author(s):  
J.B. Goodenough ◽  
A. Manthiram ◽  
J. Zhou
Keyword(s):  
Stress Relief ◽  
Redox Couple ◽  
Oxide Superconductors ◽  
High Tc Superconductors ◽  
Pairing Mechanism ◽  
Strong Electron ◽  
High Tc ◽  
Two Factors ◽  
High Transition ◽  
Copper Oxide Superconductors

ABSTRACTIt is argued that the origin of the high transition temperatures observed in Ba1−xKxBiO3 and the copper-oxide superconductors with perovskite-related structures is due to two factors: (1) overlap of a partially filled σ* band of primarily cation character and a π or π* band of mostly O-2pπ parentage permits charge transfer between cation and anion subarrays with oxygen-atom displacement perpendicular to a M-O-M bond axis and (2) bondlength mismatch places the M-O-M bondlength under a compressive or tensile stress. Relief of a compressive stress by the bending of a M-O-M bond from 180° introduces a strong electron-lattice interaction with holes; a 180° Cu-O-Cu bond allows strong electronlattice coupling with electrons of a Cu2+/+ redox couple, but not with holes in a Cu3+/2+redox couple.

Correlation in Metallic Copper Oxide Superconductors: How Large is it?

1990 ◽  
pp. 463-473
Author(s):  
W. E. Pickett ◽  
H. Krakauer ◽  
R. E. Cohen ◽  
D. Singh ◽  
D. A. Papaconstantopoulos
Keyword(s):  
Copper Oxide ◽  
Metallic Copper ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors
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