Superconducting phase fluctuations in SmFeAsO0.8F0.2 from diamagnetism at a low magnetic field above Tc
G. Prando, A. Lascialfari, A. Rigamonti, L. Romanó, S. Sanna, M. Putti, M. Tropeano
DOI 10.1103/PhysRevB.84.064507 · 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
Superconducting fluctuations (SFs) in SmFeAsO0.8F0.2 (characterized by superconducting transition temperature Tc≃52.3 K) are investigated by means of isothermal high-resolution dc magnetization measurements. The diamagnetic response above Tc to magnetic fields up to 1 T is similar to that previously reported for underdoped cuprate superconductors and justified in terms of metastable superconducting islands of nonzero order parameter lacking long-range coherence because of strong phase fluctuations. In the high-field regime (H≳1.5 T) scaling arguments predicted on the basis of the Ginzburg-Landau theory for conventional SFs are confirmed, at variance with what is observed in the low-field regime. This fact shows that two different phenomena are simultaneously present in the fluctuating diamagnetism, namely the phase SFs of novel character and the conventional SFs. High magnetic fields (1.5 T ≲H≪Hc2) are found to suppress the former while leaving unaltered the latter.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SmFeAsO0.8F0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52.3 | Pressure not reported | onset |
Similar papers
Interplay of composition, structure, magnetism, and superconductivity in SmFeAs1−xPxO1−y
similarity 0.95N. D. Zhigadlo et al.
Source status unknown — claims are unverified
Crystal structure and phase transitions across the metal-superconductor boundary in the SmFeAsO1−xFx (0≤x≤0.20) family
similarity 0.95Serena Margadonna et al.
Source status unknown — claims are unverified
Th-substituted SmFeAsO: Structural details and superconductivity with Tc above 50 K
similarity 0.94N. D. Zhigadlo et al.
Source status unknown — claims are unverified
Superconductivity above 50 K in Tb1−xThxFeAsO
similarity 0.93Lin-Jun Li et al.
Source status unknown — claims are unverified
Coexistence of Magnetic Fluctuations and Superconductivity in the Pnictide High Temperature Superconductor SmFeAsO1−xFx Measured by Muon Spin Rotation
similarity 0.93A. J. Drew et al.
Source status unknown — claims are unverified
Structural, electronic, and magnetic properties of the possible pnictide superconductor BaFeAs2
similarity 0.93Zisheng Gong et al.
Source status unknown — claims are unverified