Abstracts 2003

Abstract of Publication No. 456

N. Cavadini, D. Andreica, F. N. Gygax, A. Schenck, K. Krämer, H.-U. Güdel, H. Mutka and A. Wildes
Local spin susceptibility in KCuCl3
Physica B 335, 37-40 (2003)      Full Text (PDF)      DOI-Link     

Abstract: S = 1/2 KCuCl3 has a singlet ground state with a finite spin energy gap D = 31 K to triplet excited states. The bulk magnetic susceptibility vanishes for T << D according to the singlet nature of the ground state. Astonishingly, recent muon spin relaxation (mSR) measurements reveal fluctuating internal fields down to T = 5 K, with the onset of a quasi-static regime below T = 5 K. The presence of free electronic magnetic moments and their possible freezing at low T contradicts the bulk picture of KCuCl3. By means of polarized neutron scattering and mSR measurements on single crystals of the same batch, the nature of the local spin susceptibility is studied. The claims of a substantial muon influence in KCuCl3 are reinforced.

Last modified: 13.12.11 by Gabriela Frei