Abstract
The behaviour of the so-called weak-moment antiferromagneticstates, observed in the heavy-fermion superconductorsUPt3 andURu2Si2, is discussed inview of recent μSR results obtained as functions of control parameters such as chemical substitution and external pressure.In UPt3,the Pd substitution for Pt reveals the dynamical character of the weak-moment order. On the otherhand, μSR measurements performed on samples in which Th substitutes U suggest thatcrystallographic disorder on the magnetic sites deeply affects the fluctuation timescale. InURu2Si2, a phase separation between the so-called hidden order state, present atambient pressure, and an antiferromagnetic state, occurring under pressure, isobserved. In view of the pressure–temperature phase diagram obtained byμSR, it is deduced that the respective order parameters have different symmetries.
Submitted Version (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call