Magnetic properties of the dense Kondo system CeB6 in high magnetic fields

This work reports on the phase diagram study of the dense Kondo system CeB6 by means of magnetization (M) and transverse magnetoresistance (MR) measur ements in magnetic fields (B) to 18 T, in the temperature (T) range from 1. 8 to 40 K. The zero field resistivity displays Kondo behavior in the parama gnetic P-phase, while two discontinuities at low T were observed at T-Q app roximate to 3.5 K and T-N approximate to 2.3 K, the boundaries of the antif erro-quadrupolar (AFQ). and antiferromagnetic (AF) phases, respectively. Th e isothermal transverse MR is large and negative at low T. and it shows a d istinct feature when the P-AFQ line of the B-T phase diagram is crossed. Si milarly, the M vs. B curves at low temperatures show upward discontinuities at the phase boundary. Both the features in MR and Al at the P-AFQ line co rrelate well in T, revealing the gradual increase of the T for the onset of AFQ ordering with B. No evidence for reentrant behavior could be observed in fields to 18T. (C) 2001 Published by Elsevier Science B.V.