[Zurück]

A. Gribanov, A. Tursina, E. Murashova, Y. Seropegin, E. Bauer, H. Kaldarar, R. Lackner, H. Michor, E. Royanian, M. Reissner, P. Rogl:
"New orthorhombic modification of equiatomic CePdAl";
Journal of Physics: Condensed Matter, 18 (2006), S. 9593 - 9602.

New orthorhombic modification of equiatomic CePdAl

A Gribanov et al 2006 J. Phys.: Condens. Matter 18 9593-9602 doi:10.1088/0953-8984/18/42/006

A Gribanov 1, A Tursina 1, E Murashova 1, Y Seropegin 1, E Bauer 2,4, H Kaldarar 2, R Lackner 2, H Michor 2, E Royanian 2, M Reissner 2 and P Rogl 3
1 Department of Chemistry, Moscow State University, 119992 Moscow, Russia
2 Institute of Solid State Physics, Vienna University of Technology, A-1040 Wien, Austria
3 Institute of Physical Chemistry, University Vienna, A-1090 Wien, Austria
4 Author to whom any correspondence should be addressed
E-mail: bauer@ifp.tuwien.ac.at

Abstract.
The crystal structure of a new low-temperature modification of CePdAl was determined from single-crystal x-ray data: CePdAl-type; space group Pmmn (No. 59), Z = 14, oP42, a = 0.426 07 nm, b = 2.887 58 nm, c = 0.721 90 nm; R_F = 0.048. Physical properties of orthorhombic CePdAl are governed by a mutual balance of the RKKY interaction, the Kondo effect and crystalline electric field splitting, resulting in antiferromagnetic ordering below ~2.5 K. Electronic transport is reminiscent of a textbook-like Kondo lattice, which comes along with a significant negative magnetoresistance of more than 50% at low temperatures. Although geometrical frustration is absent when compared to the hexagonal modification of CePdAl, the ordering temperature T_N is even smaller. A possible cause is enhanced Kondo interactions.

Print publication: Issue 42 (25 October 2006)
Received 20 June 2006, in final form 15 September 2006
Published 5 October 2006

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588019

http://www.iop.org/EJ/abstract/0953-8984/18/42/006