Dimensional reduction by geometrical frustration in a cubic antiferromagnet composed of tetrahedral clusters

Ryutaro Okuma (), Maiko Kofu, Shinichiro Asai, Maxim Avdeev, Akihiro Koda, Hirotaka Okabe, Masatoshi Hiraishi, Soshi Takeshita, Kenji M. Kojima, Ryosuke Kadono, Takatsugu Masuda, Kenji Nakajima and Zenji Hiroi
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Ryutaro Okuma: University of Tokyo
Maiko Kofu: Japan Atomic Energy Agency
Shinichiro Asai: University of Tokyo
Maxim Avdeev: Australian Nuclear Science and Technology Organisation
Akihiro Koda: High Energy Accelerator Research Organization (KEK-IMSS)
Hirotaka Okabe: High Energy Accelerator Research Organization (KEK-IMSS)
Masatoshi Hiraishi: High Energy Accelerator Research Organization (KEK-IMSS)
Soshi Takeshita: High Energy Accelerator Research Organization (KEK-IMSS)
Kenji M. Kojima: High Energy Accelerator Research Organization (KEK-IMSS)
Ryosuke Kadono: High Energy Accelerator Research Organization (KEK-IMSS)
Takatsugu Masuda: University of Tokyo
Kenji Nakajima: Japan Atomic Energy Agency
Zenji Hiroi: University of Tokyo

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Dimensionality is a critical factor in determining the properties of solids and is an apparent built-in character of the crystal structure. However, it can be an emergent and tunable property in geometrically frustrated spin systems. Here, we study the spin dynamics of the tetrahedral cluster antiferromagnet, pharmacosiderite, via muon spin resonance and neutron scattering. We find that the spin correlation exhibits a two-dimensional characteristic despite the isotropic connectivity of tetrahedral clusters made of spin 5/2 Fe3+ ions in the three-dimensional cubic crystal, which we ascribe to two-dimensionalisation by geometrical frustration based on spin wave calculations. Moreover, we suggest that even one-dimensionalisation occurs in the decoupled layers, generating low-energy and one-dimensional excitation modes, causing large spin fluctuation in the classical spin system. Pharmacosiderite facilitates studying the emergence of low-dimensionality and manipulating anisotropic responses arising from the dimensionality using an external magnetic field.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24636-1

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DOI: 10.1038/s41467-021-24636-1

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