Uniaxial Pressure Effect on the Magnetic Ordered Moment and Transition Temperatures in BaFe2-xTxAs2 (T=Co,Ni)

Published

February 17, 2017

Author(s)

David W. Tam, Yu Song, Haoran Man, Sky C. Cheung, Zhiping Yin, Xingye Lu, Weiyi Wang, Benjamin A. Frandsen, Lian Liu, Zizhou Gong, Takashi U. Ito, Yipeng Cai, Murray N. Wilson, Shengli Guo, Keisuke Koshiishi, Wei Tian, Bassam Hitti, Alexandre Ivanov, Yang Zhao, Jeffrey W. Lynn, Graeme M. Luke, Tom Berlijn, Thomas A. Maier, Yasutomo J. Uemura, Pengcheng Dai

Abstract

We use neutron diffraction and muon spin relaxation to study the effect of uniaxial pressure on the paramagnetic-to-antiferromagnetic phase transition (T_N) in BaFe₂As₂ and superconducting BaFe_1.915Ni_0.085As₂. In a local moment picture, the uniaxial pressure necessary to detwin the sample may change T_N due to pressure-induced orthorhombic lattice distortion, but is not expected to increase the ordered moment of the system. While this is indeed the case for BaFe₂As₂, we find that the magnetic moment in BaFe_1.915Ni_0.085As₂ increases by as much as 20% under modest uniaxial pressures. These results are consistent with calculations of the spin susceptibility within the random-phase approximation (RPA), suggesting that Fermi surface nesting of itinerant electrons remains a crucial aspect of magnetism in iron pnictides near optimal superconductivity.

Citation

Physical Review Letters

Volume

95

Issue

6

Pub Type

Journals

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Keywords

Iron Superconductor, uniaxial pressure, neutron diffraction, itinerant magnetism, Fermi surface nesting

Citation

Tam, D. , Song, Y. , Man, H. , Cheung, S. , Yin, Z. , Lu, X. , Wang, W. , Frandsen, B. , Liu, L. , Gong, Z. , Ito, T. , Cai, Y. , Wilson, M. , Guo, S. , Koshiishi, K. , Tian, W. , Hitti, B. , Ivanov, A. , Zhao, Y. , Lynn, J. , Luke, G. , Berlijn, T. , Maier, T. , Uemura, Y. and Dai, P. (2017), Uniaxial Pressure Effect on the Magnetic Ordered Moment and Transition Temperatures in BaFe_2-xT_xAs₂ (T=Co,Ni), Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=920514 (Accessed October 30, 2025)