Abstract
It is shown that the intermetallic compound ${\mathrm{Pr}}_{3}$ Tl is a case of an induced-moment ferromagnet in which the nonmagnetic singlet ground state of ${\mathrm{Pr}}^{3+}$ is spontaneously polarized below 11 \ifmmode^\circ\else\textdegree\fi{}K due to slightly overcritical exchange interactions. By substituting only 7 at.% of La for Pr, both the ordered moment ${m}_{0}$ (at 0 \ifmmode^\circ\else\textdegree\fi{}K) and the Curie temperature ${T}_{C}$ are reduced to zero, in contrast to the usual behavior of local-moment systems. The observed ratios of $\frac{{m}_{0}}{{T}_{C}}$ for different La concentrations are compared with theoretical expectations. Specific-heat and resistivity anomalies at the transition are shown to be much reduced from what one would expect in an ordinary ferromagnet.
Sign-in/Register to access full text options 
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
