Coexistence of Ferromagnetic and Stripe-Type Antiferromagnetic Spin Fluctuations in YFe2Ge2

Published

May 31, 2019

Author(s)

Hongliang Wo, Qisi Wang, Yao Shen, Xiaowen Zhang, Yiqing Hao, Yu Feng, Shoudong Shen, Zheng He, Bingying Pan, Wenbin Wang, K. Nakajima, S. Ohira-Kawamura, P. Steffens, M. Boehm, K. Schmalzl, T. R. Forrest, M. Matsuda, Yang Zhao, Jeffrey W. Lynn, Zhiping Yin, Jun Zhao

Abstract

We report neutron scattering measurments of single-crystalline YFe₂Ge₂ in the normal state, which has the same crystal structure to 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 weavevector (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 apply that the ferromagnetic correlations may be a key ingredient for iron-based materials.

Citation

Physical Review Letters

Volume

122

Issue

21

Pub Type

Journals

Download Paper

Local Download

Keywords

Spin fluctuations, neutron scattering, no long range order, 1:2:2 superconductor family, stripe-type spin fluctuations, ferromagnetic spin fluctuations

Citation

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. , Forrest, T. , Matsuda, M. , Zhao, Y. , Lynn, J. , Yin, Z. and Zhao, J. (2019), Coexistence of Ferromagnetic and Stripe-Type Antiferromagnetic Spin Fluctuations in YFe₂Ge₂, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926631 (Accessed October 26, 2025)