TY - JOUR
T1 - Pressure effects on magnetism in U intermetallics
T2 - The UPtAl case
AU - Sechovský, V.
AU - Honda, F.
AU - Prokeš, K.
AU - Griveau, J. C.
AU - Andreev, A. V.
AU - Arnold, Z.
AU - Kamarád, J.
AU - Oomi, G.
N1 - Funding Information:
This work is a part of the research program MSM113200002 that is financed by the Ministry of Education of The Czech Republic. It was also partly supported by the Czech Grant Agency (Grant # 202/02/0739). Financial support for access to the Actinide User Laboratory at ITU-Karlsruhe within the frame of the European Community Access to Research Infrastructures action of the Improving Human Potential Program (IHP), Contract no. HPRI-CT-2001-00118 is also acknowledged.
PY - 2005/4
Y1 - 2005/4
N2 - The influence of pressure on the formation of U magnetic moments and mediation of exchange interactions are two principal aspects of the complex role of the 5f-ligand hybridization in magnetism of U intermetallics. Application of external pressure yields changes of interatomic distances, which are the crucial parameters controlling the hybridization. We report on pressure experiments with a 5f-electron ferromagnet UPtAl (TC=42.5 K, M s=1.4 μB/f.u. at ambient pressure). Application of hydrostatic pressure up to 1 GPa yields decrease of the spontaneous magnetization Ms with a rate dMs/dp=-0.027 μB/GPa, whereas TC increases (dTC/dp=2.5 K/GPa). Extension of the electrical resistivity measurements of UPtAl to pressures up to 22 GPa reveals that the initial increase of TC with pressure continues up to 6 GPa, where TC reaches the maximum value, and decreases with further increasing pressure. The drastic change of the R(T) curve at 17 GPa is presumably connected with suppression of ferromagnetism in UPtAl.
AB - The influence of pressure on the formation of U magnetic moments and mediation of exchange interactions are two principal aspects of the complex role of the 5f-ligand hybridization in magnetism of U intermetallics. Application of external pressure yields changes of interatomic distances, which are the crucial parameters controlling the hybridization. We report on pressure experiments with a 5f-electron ferromagnet UPtAl (TC=42.5 K, M s=1.4 μB/f.u. at ambient pressure). Application of hydrostatic pressure up to 1 GPa yields decrease of the spontaneous magnetization Ms with a rate dMs/dp=-0.027 μB/GPa, whereas TC increases (dTC/dp=2.5 K/GPa). Extension of the electrical resistivity measurements of UPtAl to pressures up to 22 GPa reveals that the initial increase of TC with pressure continues up to 6 GPa, where TC reaches the maximum value, and decreases with further increasing pressure. The drastic change of the R(T) curve at 17 GPa is presumably connected with suppression of ferromagnetism in UPtAl.
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U2 - 10.1016/j.jmmm.2004.11.317
DO - 10.1016/j.jmmm.2004.11.317
M3 - Article
AN - SCOPUS:14944343433
SN - 0304-8853
VL - 290-291 PART 1
SP - 629
EP - 632
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
ER -