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Multiple magnetic phase transitions in Tb(3)Cu(4)Si(4).

L Gondek¹, A Szytuła, D Kaczorowski

¹Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|June 23, 2011

Summary

This study reveals that terbium (Tb) ions in Tb(3)Cu(4)Si(4) exhibit complex antiferromagnetic ordering at distinct temperatures, confirmed by magnetometry and neutron diffraction. The findings clarify the magnetic behavior of this intermetallic compound.

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Area of Science:

Condensed matter physics
Materials science
Solid-state chemistry

Background:

The intermetallic compound Tb(3)Cu(4)Si(4) possesses a complex crystal structure.
Understanding the magnetic properties of rare-earth based materials is crucial for developing new magnetic technologies.

Purpose of the Study:

To investigate the magnetic and thermal properties of polycrystalline Tb(3)Cu(4)Si(4).
To elucidate the magnetic ordering behavior of Tb ions in its distinct crystallographic sites.

Main Methods:

Magnetometric measurements
Electrical resistivity measurements
Thermopower measurements
Heat capacity measurements
Reanalysis of neutron diffraction data

Main Results:

Tb(3)Cu(4)Si(4) crystallizes in a Gd(3)Cu(4)Ge(4)-type orthorhombic structure (Immm space group).
Terbium ions occupy two inequivalent crystallographic sites (2d and 4e).
Bulk measurements and neutron diffraction data indicate antiferromagnetic ordering of two magnetic sublattices at different temperatures.

Conclusions:

The magnetic behavior of Tb(3)Cu(4)Si(4) is characterized by two distinct antiferromagnetic transitions.
The observed magnetic ordering is consistent with the crystallographic structure and the presence of two inequivalent Tb sites.