Structural and superconducting properties of oxygen-deficient NdBa2Cu3O7−δ
H. Shaked, B. W. Veal, J. Faber, Jr., R. L. Hitterman, U. Balachandran, G. Tomlins, H. Shi, L. Morss, A. P. Paulikas
DOI 10.1103/PhysRevB.41.4173 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Neutron diffraction was used to determine the structural properties of oxygen deficient NdBa2Cu3O7−δ for 0.09<δ<0.74. It was found that superconductivity disappears at the orthorhombic-to-tetragonal phase transition which occurs at δOT=0.45. Structural parameters vary smoothly with δ but exhibit a change in slope at the orthorhombic-to-tetragonal transition. The structural properties exhibit the same features found in YBa2Cu3O7−δ where δOT=0.65. It is shown that the repulsion energy of oxygen atoms in the O(1) and O(5) sites in NdBa2Cu3O7−δ is smaller than in YBa2Cu3O7−δ. This lower repulsion energy stabilizes the orthorhombic phase at lower values of δ. It is argued that the disappearance of superconductivity at the orthorhombic-to-tetragonal transition is an inherent property of the RBa2Cu3O7−δ (R denotes rare earth) system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | onset |
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 59 | Pressure not reported | onset |
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure not reported | onset |
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | onset |
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
Similar papers
Pressure-induced lattice instabilities and superconductivity in YBa2Cu4O8 and optimally doped YBa2Cu3O7−δ
similarity 0.96M. Calamiotou et al.
Source status unknown — claims are unverified
Oxygen concentration effect on Tc of the Bi-Ca-Sr-Cu-O superconductor
similarity 0.96D. E. Morris et al.
Source status unknown — claims are unverified
Electronic structure of the high-temperature oxide superconductors
similarity 0.96Warren E. Pickett
Source status unknown — claims are unverified
Implications of crystal-field and intra-atomic interactions for the electronic structure of high-Tc superconductors
similarity 0.96Frank J. Adrian
Source status unknown — claims are unverified
Correlation between oxygen isotope effects on transition temperature and magnetic penetration depth in high-temperature superconductors close to optimal doping
similarity 0.96R. Khasanov et al.
Source status unknown — claims are unverified
Doping dependence of Tc and its related isotope effect in high-temperature superconductors
similarity 0.96A. Bussmann-Holder et al.
Source status unknown — claims are unverified