Berlin 2015 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.42: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Possibility of a two-dimensional spin liquid in CePdAl induced by partial geometric frustration? — •V. Fritsch1,2, K. Grube2, W. Kittler2, C. Taubenheim2, Z. Huesges3, S. Lucas3, E. Green4, O. Stockert3, and H. v. Löhneysen21Universität Augsburg, Institut für Physik, Experimentalphysik VI, Germany — 2Karlsruher Institut für Technologie, Germany — 3Max-Planck-Institut für chemische Physik fester Stoffe, Dresden, Germany — 4Hochfeldzentrum Dresden-Rossendorf, Germany

CePdAl crystallizes in the hexagonal ZrNiAl structure, where the magnetic ions form a distorted kagomé lattice. At TN = 2.7 K the onset of antiferromagnetic (AF) order is observed. Neutron scattering experiments [1] revealed a partial frustration in the distorted kagomé planes of this structure: two-thirds of the Ce moments form ferromagnetic chains, which are antiferromagnetically coupled, the remaining third do not participate in any long-range order. Along the c-axis the magnetic moments exhibit an amplitude modulation. Accordingly, the kagomé planes are stacked on top of each other, resulting in corrugated AF planes parallel to the c-axis formed by the ordered magnetic moments, which are separated by the frustrated moments [2]. It is an intriguing and yet unresolved question if this third of frustrated moments forms a spin liquid state in CePdAl. Based on measurements of specific heat, thermal expansion, magnetization and electrical resistivity we want to discuss this possibility.

[1] A. Dönni et al., J. Phys.: Condens. Matter 8, 11213 (1996).

[2] V. Fritsch et al., Phys. Rev. B 89, 054416 (2014).

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2015 > Berlin