Publications in Scientific Journals:
F.N. Gygax, A. Schenck, Y. Onuki, C. Reichl, G. Wiesinger:
"Magnetic properties of CeRh3B2 investigated by muon spin rotation spectroscopy";
Physical Review B,
73
(2006),
144423-1
- 144423-14.
English abstract:
Magnetic properties of CeRh3B2investigated by muon spin rotation spectroscopy
F. N. Gygax and A. Schenck
Institute for Particle Physics of ETH Zurich (IPP), CH-5232 Villigen PSI, Switzerland
Y. Onuki
Faculty of Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560, Japan
Ch. Reichl and G. Wiesinger
Institute for Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria
(Received 28 June 2005; revised 4 November 2005; published 20 April 2006)
We report on positive muon spin rotation (µ+SR) measurements on hexagonal CeRh3B2 single crystals. This ferromagnetic material, with the high Curie temperature of TC ~ 120 K, shows anomalous magnetic properties. In the magnetically ordered state, two spontaneous µ+-precession frequencies are observed in zero applied magnetic field. The peculiar temperature dependence of these frequencies shows that a magnetization is found on Ce and, over a wide temperature range, on the Rh atoms. There is a strong indication that a significant negative fraction of the magnetization connected to the Ce atoms is delocalized on the c-axis Ce-Ce chains. The analysis renders it necessary to allow for an unusual temperature dependence of the Rh-sublattice magnetization, deviating significantly from the Ce-sublattice magnetization. This points to a temperature dependent exchange coupling between the Ce and Rh 4f and 4d states. Transverse-field measurements above TC allow one to specify the interstitial sites occupied by the muons and indicate the presence of long-range µ+ diffusion for T>125 K.
©2006 The American Physical Society
URL: http://link.aps.org/abstract/PRB/v73/e144423
doi:10.1103/PhysRevB.73.144423
PACS: 75.50.Cc, 75.30.Cr, 76.60.Cq, 76.75.+i
Online library catalogue of the TU Vienna:
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05938239
Electronic version of the publication:
http://link.aps.org/abstract/PRB/v73/e144423
Created from the Publication Database of the Vienna University of Technology.