Antiferromagnetism in CaCu$_{3}$Ti$_{4}$O$_{12}$ studied by magnetic Raman spectroscopy

Details Antiferromagnetism in CaCu$_{3}$Ti$_{4}$O$_{12}$ studied by magnetic Raman spectroscopy Antiferromagnetism in CaCu$_{3}$Ti$_{4}$O$_{12}$ studied by magnetic Raman spectroscopy

2001-12-16

arxiv.org/abs/cond-mat/0112282v1

Phys. Rev. B 65, 052406 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

To be published in Phys. Rev. B, 01 February 2002

Scientific paper

10.1103/PhysRevB.65.052406

For CaCu$_{3}$Ti$_{4}$O$_{12}$ -- an insulator that exhibits a giant dielectric response above 100 K -- Cu$^{2+}$ antiferromagnetic spin ordering has been investigated by magnetic Raman scattering and magnetization measurements. Below the N\'eel temperature, T$_{N} = 25$ K, magnetic excitations have been identified. Above T$_{N}$ Raman spectra reveal short-range antiferromagnetic fluctuations that increase with cooling like T$^{-1}$. No deviations from Curie-Weiss law have been observed above T$_{N}$.

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