Short-range Incommensurate Magnetic Order Near the Superconducting Phase Boundary in Fe1+δTe1−xSex

Journal Article · Thu Sep 10 04:00:00 EDT 2009 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.80.104506· OSTI ID:1040190

Wen, J; Xu, G; Xu, Z; Lin, Z W; Li, Q; Ratcliff, W; Gu, G; Tranquada, J M

We performed elastic neutron-scattering and magnetization measurements on Fe{sub 1.07}Te{sub 0.75}Se{sub 0.25} and FeTe{sub 0.7}Se{sub 0.3}. Short-range incommensurate magnetic order is observed in both samples. In the former sample with higher Fe content, a broad magnetic peak appears around (0.46,0,0.5) at low temperature, while in FeTe{sub 0.7}Se{sub 0.3}, the broad magnetic peak is found to be closer to the antiferromagnetic (AFM) wave vector (0.5,0,0.5). The incommensurate peaks are only observed on one side of the AFM wave vector for both samples, which can be modeled in terms of an imbalance of ferromagnetic/antiferromagnetic correlations between nearest-neighbor spins. We also find that with higher Se (and lower Fe) concentration, the magnetic order becomes weaker while the superconducting temperature and volume increase.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: USDOE SC OFFICE OF SCIENCE (SC)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1040190
• Report Number(s): BNL--90561-2009-JA; KC0202010
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 10 Vol. 80; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
FERROMAGNETIC MATERIALS
IRON ALLOYS
MAGNETIZATION
NEUTRON DIFFRACTION
SELENIUM ALLOYS
SUPERCONDUCTORS
TELLURIUM ALLOYS
VECTORS
antiferromagnetic materials
ferromagnetic materials
iron alloys
magnetic superconductors
magnetisation
neutron diffraction
selenium alloys
tellurium alloys