Reentrant Softening in Copper-Oxide Superconductors

1987 ◽  
Vol 99 ◽  
Author(s):  
C. E. Violet ◽  
T. Datta ◽  
H. M. Ledbetter ◽  
C. Almasan ◽  
J. Estrada
Keyword(s):  
Copper Oxide ◽  
Sound Velocity ◽  
Normal State ◽  
Superconducting State ◽  
Physical Property ◽  
Elastic Stiffness ◽  
Superconducting Phase ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors

ABSTRACTOn the basis of our reentrant-softening model, sound-velocity results in La1.85Sr0.15CuO4 and YBa2Cu3O7−x are shown to be neither dissimilar nor inconsistent with thermodynamic requirements. In both materials, as temperature decreases, the lattice softens just above Tc. Below Tc, this softening is offset by increased stiffness associated with the developing superconducting phase. This model agrees with results from other physical-property measurements, and it predicts that elastic stiffness is higher in the normal state than in the superconducting state.

Normal-state conductivity between CuO2 planes in copper oxide superconductors

Nature ◽  
1991 ◽  
Vol 350 (6319) ◽  
pp. 596-598 ◽  
Author(s):  
T. Ito ◽  
H. Takagi ◽  
S. Ishibashi ◽  
T. Ido ◽  
S. Uchida
Keyword(s):  
Copper Oxide ◽  
Normal State ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors

NMR studies of the superconducting state of copper oxide superconductors

1992 ◽  
Vol 3 (3-4) ◽  
pp. 423-448 ◽  
Author(s):  
C. P. Slichter ◽  
S. E. Barrett ◽  
J. A. Martindale ◽  
D. J. Durand ◽  
C. H. Pennington ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Superconducting State ◽  
Oxide Superconductors ◽  
Nmr Studies ◽  
Copper Oxide Superconductors

scholarly journals Universal quantum phase transition from superconducting to insulating-like states in pressurized Bi2Sr2CaCu2O8+δ superconductors

2021 ◽  
Author(s):  
Liling Sun ◽  
Yazhou Zhou ◽  
Jing Guo ◽  
Shu Cai ◽  
Jinyu Zhao ◽  
...  
Keyword(s):  
Phase Transition ◽  
Copper Oxide ◽  
Quantum Phase Transition ◽  
Superconducting State ◽  
Unit Cell ◽  
Quantum Phase ◽  
Oxide Superconductors ◽  
Chemical Doping ◽  
Universal Quantum ◽  
Copper Oxide Superconductors

Abstract Copper oxide superconductors have been continually fascinating the communities of condensed matter physics and material sciences because they host the highest ambient-pressure superconducting transition temperature ( T c ) and mysterious physics 1–3. Searching for the universal correlation between the superconducting state and its normal state or neighboring ground state is believed to be an effective way for finding clues to elucidate the underlying mechanism of the superconductivity. One of the common pictures for the copper oxide superconductors is that a well-behaved metallic phase will present after the superconductivity is entirely suppressed by chemical doping 4–8 or application of the magnetic field 9. Here, we report the first observation of universal quantum phase transition from superconducting state to insulating-like state under pressure in the under-, optimally- and over-doped Bi2Sr2CaCu2O8+δ (Bi2212) superconductors with two CuO2 planes in a unit cell. The same phenomenon has also been found in the Bi2Sr1.63La0.37CuO6+δ (Bi2201) superconductor with one CuO2 plane and the Bi2.1Sr1.9Ca2Cu3O10+δ (Bi2223) superconductor with three CuO2 planes in a unit cell. These results not only provide fresh information on the cuprate superconductors but also pose a new challenge for achieving unified understandings on the mechanism of the high-Tc superconductivity.

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