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Coexistence of ferromagnetic and stripe-type antiferromagnetic spin fluctuations in YFe 2 Ge 2

DOI: 10.1103/PhysRevLett.122.217003 DOI Help

Authors: H. Wo (Fudan University) , Q. Wang (Fudan University) , Y. Shen (Fudan University) , X. Zhang (Fudan University) , Y. Hao (Fudan University) , Y. Feng (Fudan University) , S. Shen (Fudan University) , Z. He (Fudan University) , B. Pan (Fudan University) , W. Wang (Fudan University) , K. Nakajima (Fudan University) , S. Ohira-kawamura (J-PARC Center) , P. Steffens (Institut Laue-Langevin) , M. Boehm (Institut Laue-Langevin) , K. Schmalzl (Forschungszentrum Jülich GmbH) , T. R. Forrest (Diamond Light Source) , M. Matsuda (Oak Ridge National Laboratory) , Y. Zhao (National Institute of Standards and Technology; University of Maryland) , J. W. Lynn (National Institute of Standards and Technology) , Z. Yin (Beijing Normal University) , J. Zhao (Fudan University; Collaborative Innovation Center of Advanced Microstructures)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 122

State: Published (Approved)
Published: May 2019

Abstract: We report neutron scattering measurements of single-crystalline YFe 2 Ge 2 in the normal state, which has the same crystal structure as the 122 family of iron pnictide superconductors. YFe 2 Ge 2 does not exhibit long-range magnetic order but exhibits strong spin fluctuations. Like the iron pnictides, YFe 2 Ge 2 displays anisotropic stripe-type antiferromagnetic spin fluctuations at ( π , 0, π ). More interesting, however, is the observation of strong spin fluctuations at the in-plane ferromagnetic wave vector (0, 0, π ). These ferromagnetic spin fluctuations are isotropic in the ( H , K ) plane, whose intensity exceeds that of stripe spin fluctuations. Both the ferromagnetic and stripe spin fluctuations remain gapless down to the lowest measured energies. Our results naturally explain the absence of magnetic order in YFe 2 Ge 2 and also imply that the ferromagnetic correlations may be a key ingredient for iron-based materials.

Journal Keywords: Pairing mechanisms; Spin dynamics; Superconducting phase transition; High-temperature superconductors; Pnictides; Neutron scattering

Subject Areas: Physics, Materials

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