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Quantum Griffiths phase in CePd(1-x)Rh(x) with x ~ 0.8 | M. Brando
; T. Westerkamp
; M. Deppe
; P. Gegenwart
; C. Geibel
; F. Steglich
; | Date: |
30 Oct 2009 | Abstract: | The magnetic field dependence of the magnetisation ($M$) and the temperature
dependence of the ac susceptibility ($chi’ = dM/dH$) of CePd(1-x)Rh(x) single
crystals with $0.80 leq x leq 0.86$ are analysed within the frame of the
quantum Griffiths phase scenario, which predicts $M propto H^{lambda}$ and
$chi’ propto T^{lambda-1}$ with $0 leq lambda leq 1$. All $M$ vs $H$ and
$chi’$ vs $T$ data follow the predicted power-law behaviour. The parameter
$lambda$, extracted from $chi’(T)$, is very sensitive to the Rh content $x$
and varies systematically with $x$ from -0.1 to 0.4. The value of $lambda$,
derived from $M(H)$ measurements on a cpr single crystal, seems to be rather
constant, $lambda approx 0.2$, in a broad range of temperatures between 0.05
and 2 K and fields up to about 10 T. All observed signatures and the $lambda$
values are thus compatible with the quantum Griffiths scenario. | Source: | arXiv, 0910.5840 | Services: | Forum | Review | PDF | Favorites |
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