Suppression of magnetism and development of superconductivity within the collapsed tetragonal phase of Ca0.67Sr0.33Fe2As2 under pressure
J. R. Jeffries, N. P. Butch, K. Kirshenbaum, S. R. Saha, G. Samudrala, S. T. Weir, Y. K. Vohra, J. Paglione
DOI 10.1103/PhysRevB.85.184501 · 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
Structural and electronic characterizations of (Ca0.67Sr0.33)Fe2As2 have been performed as a function of pressure up to 12 GPa using conventional and designer diamond anvil cells. The compound (Ca0.67Sr0.33)Fe2As2 behaves intermediately between its end members, displaying a suppression of magnetism and the onset of superconductivity. Like other members of the AFe2As2 family, (Ca0.67Sr0.33)Fe2As2 undergoes a pressure-induced isostructural volume collapse, which we associate with the development of As-As bonding across the mirror plane of the structure. This collapsed tetragonal phase abruptly cuts off the magnetic state and supports superconductivity with a maximum Tc=22.2K. The maximum Tc of the superconducting phase is not strongly correlated with any structural parameter, but its proximity to the abrupt suppression of magnetism as well as the volume-collapse transition suggests that magnetic interactions and structural inhomogeneity may play a role in its development.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Ca0.67Sr0.33)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22.2 | 1.76 GPa | onset |
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
Similar papers
Persistent Fe moments in the normal-state collapsed-tetragonal phase of the pressure-induced superconductor Ca0.67Sr0.33Fe2As2
similarity 0.96J. R. Jeffries et al.
Source status unknown — claims are unverified
Superconducting and Ferromagnetic Phases Induced by Lattice Distortions in Stoichiometric SrFe2As2 Single Crystals
similarity 0.96S. R. Saha et al.
Source status unknown — claims are unverified
Appearance of pressure-induced superconductivity in BaFe2As2 under hydrostatic conditions and its extremely high sensitivity to uniaxial stress
similarity 0.96Takehiro Yamazaki et al.
Source status unknown — claims are unverified
Superconductivity and the effects of pressure and structure in single-crystalline SrNi2P2
similarity 0.96F. Ronning et al.
Source status unknown — claims are unverified
Temperature-composition phase diagrams for Ba1−xSrxFe2As2 (0 ≤x≤ 1) and superconducting Ba0.5Sr0.5(Fe1−yCoy)2As2 (0 ≤y≤ 0.141)
similarity 0.96Jonathan E. Mitchell et al.
Source status unknown — claims are unverified
Superconducting state coexisting with a phase-separated static magnetic order in (Ba,K)Fe2As2, (Sr,Na)Fe2As2, and CaFe2As2
similarity 0.96T. Goko et al.
Source status unknown — claims are unverified