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Anomalous Behavior of the Low‐Temperature Spin Disorder Resistivity in PrH 2+ x Compounds
Author(s) -
Daou J. N.,
Burger J. P.,
Vajda P.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221540131
Subject(s) - condensed matter physics , tetragonal crystal system , antiferromagnetism , electrical resistivity and conductivity , ground state , excited state , lattice (music) , materials science , crystal structure , chemistry , physics , crystallography , atomic physics , acoustics , quantum mechanics
Pure PrH 2 dihydride presents an antiferromagnetic transition at 3.35 K; above T N , a decrease of the resistivity ϱ( T ) is observed which can be explained by a Kondo effect but also by crystal field effects if the first non magnetic excited state Γ 1 it situated very near to the magnetic Γ 5 ground state. Magnetic ordering and the resistivity minimum disappear in PrH 2+ x compounds when x ≫ 0.08; this can be explained if there is an inversion of the Γ 5 and Γ 1 states or if there is a splitting of the triplet Γ 5 state due to a tetragonal deformation of the lattice. Anomalous values of the low temperature slope dϱ/d T seem to correlate with the occurrence of this cubic‐tetragonal transformation of the host lattice.