Journal Article

FZJ-2019-03533

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Coexistence of Ferromagnetic and Stripe-Type Antiferromagnetic Spin Fluctuations in YFe 2 Ge 2

Wo, H. ; Wang, Q. ; Shen, Y. ; Zhang, X. ; Hao, Y. ; Feng, Y. ; Shen, S. ; He, Z. ; Pan, B. ; Wang, W. ; Nakajima, K. ; Ohira-Kawamura, S. ; Steffens, P. ; Boehm, M. ; Schmalzl, K.FZJ* ; Forrest, T. R. ; Matsuda, M. ; Zhao, Y. ; Lynn, J. W. ; Yin, Z. ; Zhao, J. (Corresponding author)

2019
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/22398  doi:10.1103/PhysRevLett.122.217003

Abstract: We report neutron scattering measurements of single-crystalline YFe2Ge2 in the normal state, which has the same crystal structure as the 122 family of iron pnictide superconductors. YFe2Ge2 does not exhibit long-range magnetic order but exhibits strong spin fluctuations. Like the iron pnictides, YFe2Ge2 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 YFe2Ge2 and also imply that the ferromagnetic correlations may be a key ingredient for iron-based materials.

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Streumethoden (PGI-4)
3. JARA-FIT (JARA-FIT)
4. JCNS-ILL (JCNS-ILL)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)
2. 524 - Controlling Collective States (POF3-524) (POF3-524)
3. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
4. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
5. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. ILL-IN12: Cold neutron 3-axis spectrometer

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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