Correlations and Incipient Antiferromagnetic order within the Linear Mn Chains of Metallic Ti4MnBi2

Published

July 6, 2020

Author(s)

Abhishek Pandey, Ping Mao, M. Klemm, H. He, H. Wang, X. Qian, Jeffrey W. Lynn, M.C. Aronson

Abstract

We report measurements on Ti₄MnBi₂, where a crystal structure involving chains of Mn ions suggests one-dimensional magnetic character. The electrical resistivity is metallic, consistent with the results of electronic structure calculations that find a robust Fermi surface, albeit with moderate electronic correlations that originate largely with the Ti d-electrons. Curie-Weiss fits to the magnetic susceptibility find that the Mn moments are in the low-spin S = 1=2 configuration. Neutron diffraction measurements detect weak antiferromagnetic order, with further evidence for the small staggered moment coming from the small entropy associated with the ordering peak in the specific heat as well as the results of spin-polarized electronic structure calculations. The antiferromagnetic moments are apparently associated with the d_x²-_y2 and d_xy orbitals of Mn while the remaining orbitals are delocalized. Strong quantum fluctuations, possibly related to an electronic instability that forms the Mn moment or to the one-dimensional character of Ti₄MnBi₂, nearly overcome magnetic order.

Citation

Physical Review B

Volume

102

Issue

1

Pub Type

Journals

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Keywords

One dimensional magnet, metallic, neutron diffraction, antiferromagnet.

Citation

Pandey, A. , Mao, P. , Klemm, M. , He, H. , Wang, H. , Qian, X. , Lynn, J. and Aronson, M. (2020), Correlations and Incipient Antiferromagnetic order within the Linear Mn Chains of Metallic Ti₄MnBi₂, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929500 (Accessed April 25, 2024)