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



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


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.
Physical Review Letters


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


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 YFe<sub>2</sub>Ge<sub>2</sub>, Physical Review Letters, [online], (Accessed March 25, 2023)
Created May 30, 2019, Updated October 12, 2021