Pressure effects on magnetism in U intermetallics: The UPtAl case

V. Sechovský; F. Honda; K. Prokeš; J. C. Griveau; A. V. Andreev; Z. Arnold; J. Kamarád; G. Oomi

doi:10.1016/j.jmmm.2004.11.317

Pressure effects on magnetism in U intermetallics: The UPtAl case

V. Sechovský, F. Honda, K. Prokeš, J. C. Griveau, A. V. Andreev, Z. Arnold, J. Kamarád, G. Oomi

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

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 (T_C=42.5 K, M _s=1.4 μ_B/f.u. at ambient pressure). Application of hydrostatic pressure up to 1 GPa yields decrease of the spontaneous magnetization M_s with a rate dM_s/dp=-0.027 μ_B/GPa, whereas T_C increases (dT_C/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 T_C with pressure continues up to 6 GPa, where T_C 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.

Original language	English
Pages (from-to)	629-632
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	290-291 PART 1
DOIs	https://doi.org/10.1016/j.jmmm.2004.11.317
Publication status	Published - 2005 Apr
Externally published	Yes

Keywords

Curie temperature
Electrical resistivity
Itinerant 5f-electron ferromagnetism
Magnetization
Pressure effect

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2004.11.317

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@article{30bab3053ab54f709b4bec30bba46ae3,

title = "Pressure effects on magnetism in U intermetallics: The UPtAl case",

abstract = "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.",

keywords = "Curie temperature, Electrical resistivity, Itinerant 5f-electron ferromagnetism, Magnetization, Pressure effect",

author = "V. Sechovsk{\'y} and F. Honda and K. Proke{\v s} and Griveau, {J. C.} and Andreev, {A. V.} and Z. Arnold and J. Kamar{\'a}d and G. Oomi",

note = "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.",

year = "2005",

month = apr,

doi = "10.1016/j.jmmm.2004.11.317",

language = "English",

volume = "290-291 PART 1",

pages = "629--632",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

}

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.

KW - Curie temperature

KW - Electrical resistivity

KW - Itinerant 5f-electron ferromagnetism

KW - Magnetization

KW - Pressure effect

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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 -

Pressure effects on magnetism in U intermetallics: The UPtAl case

Abstract

Keywords

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