Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.57: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Single crystal growth and investigation of the magnetism of the alloy CePd1−xRhx for concentrations x ≥ 0.6 — •M. Deppe1, P. Pedrazzini2, N. Caroca-Canales1, C. Geibel1, and J.G. Sereni3 — 1Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany — 2DPMC-Université de Genève, Q. Ernest - Ansermet, 1211 Genève, Switzerland — 3Lab. Bajas Temperaturas, Centro Atómico Bariloche (CNEA), 8400 S.C. de Bariloche, Argentina
In the orthorhombic alloy CePd1−xRhx
the continuous decrease of the ferromagnetic ground state
TC (x) can be followed over more than a decade in T,
from 6.6 K for x = 0 to 0.25 K at x = 0.8. Additional low
temperature measurements suggest a smeared ferromagnetic
quantum-critical point (QCP) for xcr between 0.87 and 0.9.
All these results were based on CePd1−xRhx
polycrystals. In order to get a more precise insight into the
magnetic behaviour in the critical region we grow
CePd1−xRhx single crystals in the range x ≥ 0.6.
We used the Bridgman technique with a pulling rate of 3-5 mm.
Differential thermoanalysis measurements indicate a low melting
point Tm = 1090 ± 15 ∘C. The lattice parameters
were defined with X-ray powder diffraction and the composition
was investigated with microprobe analysis. We performed specific
heat and resistivity measurements down to 0.4 K and compare our
results with the previous results on polycrystalline samples.
Further we studied the decrease of the magnetic anisotropy with
x by susceptibility and magnetization measurements. These
results will be discussed in relation to the scenario for the
critical concentration.