Magnetoresistance measurements in UCu4-xAl8-x compounds

M. S. Torikachvili; R. F. Jardim; S. Chang; A. Christianson; R. Muccillo; H. Nakotte; A. H. Lacerda

doi:10.1016/S0304-8853(00)00744-7

Magnetoresistance measurements in UCu_4-xAl_8-x compounds

M. S. Torikachvili, R. F. Jardim, S. Chang, A. Christianson, R. Muccillo, H. Nakotte, A. H. Lacerda

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

3 Scopus citations

Abstract

The intermetallic UCu_4+x Al_8-xcompounds (0.1 ≤ x ≤ 1.95) have remarkable electronic and magnetic properties. The Cu-poor compositions within this x-range are antiferromagnetic (AF). The Néel temperature (TN) drops gradually from ∝ 36 K for x = 0.1 until AF is completely suppressed near x = 1.1, while the Sommerfeld coefficient (γ) increases dramatically with x, reaching a maximum value of 750mJ/molK² for x = 1.75. Reported in this investigation are magnetoresistance (MR) and magnetic susceptibility (x) measurements at low temperatures (T) and high magnetic fields (B). The isothermal MR data below 40 K crosses over from positive in the low-x to negative in the high-x range. These results are interpreted in the context of spin fluctuations, hybridization, and non-magnetic atomic disorder.

Original language	English
Pages (from-to)	42-44
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	226-230
Issue number	PART I
DOIs	https://doi.org/10.1016/S0304-8853(00)00744-7
State	Published - 2001
Externally published	Yes

Funding

The support of NSF Grant No. INT-9725929 (MST, AHL), FAPESP Grant No. 99/10798-0 (RFJ, RM), and CNPq (Brazil) (RFJ) are gratefully acknowledged. Work at the NHMFL was performed under the auspices of the NSF, the state of Florida, and the USDOE.

Funders	Funder number
National Science Foundation	INT-9725929
National Science Foundation
Fundação de Amparo à Pesquisa do Estado de São Paulo	99/10798-0
Fundação de Amparo à Pesquisa do Estado de São Paulo
Conselho Nacional de Desenvolvimento Científico e Tecnológico

Keywords

Antiferromagnetism
Heavy fermions
Magnetoresistance

Access to Document

10.1016/S0304-8853(00)00744-7

Cite this

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title = "Magnetoresistance measurements in UCu4-xAl8-x compounds",

abstract = "The intermetallic UCu4+x Al8-xcompounds (0.1 ≤ x ≤ 1.95) have remarkable electronic and magnetic properties. The Cu-poor compositions within this x-range are antiferromagnetic (AF). The N{\'e}el temperature (TN) drops gradually from ∝ 36 K for x = 0.1 until AF is completely suppressed near x = 1.1, while the Sommerfeld coefficient (γ) increases dramatically with x, reaching a maximum value of 750mJ/molK2 for x = 1.75. Reported in this investigation are magnetoresistance (MR) and magnetic susceptibility (x) measurements at low temperatures (T) and high magnetic fields (B). The isothermal MR data below 40 K crosses over from positive in the low-x to negative in the high-x range. These results are interpreted in the context of spin fluctuations, hybridization, and non-magnetic atomic disorder.",

keywords = "Antiferromagnetism, Heavy fermions, Magnetoresistance",

author = "Torikachvili, {M. S.} and Jardim, {R. F.} and S. Chang and A. Christianson and R. Muccillo and H. Nakotte and Lacerda, {A. H.}",

year = "2001",

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TY - JOUR

T1 - Magnetoresistance measurements in UCu4-xAl8-x compounds

AU - Torikachvili, M. S.

AU - Jardim, R. F.

AU - Chang, S.

AU - Christianson, A.

AU - Muccillo, R.

AU - Nakotte, H.

AU - Lacerda, A. H.

PY - 2001

Y1 - 2001

N2 - The intermetallic UCu4+x Al8-xcompounds (0.1 ≤ x ≤ 1.95) have remarkable electronic and magnetic properties. The Cu-poor compositions within this x-range are antiferromagnetic (AF). The Néel temperature (TN) drops gradually from ∝ 36 K for x = 0.1 until AF is completely suppressed near x = 1.1, while the Sommerfeld coefficient (γ) increases dramatically with x, reaching a maximum value of 750mJ/molK2 for x = 1.75. Reported in this investigation are magnetoresistance (MR) and magnetic susceptibility (x) measurements at low temperatures (T) and high magnetic fields (B). The isothermal MR data below 40 K crosses over from positive in the low-x to negative in the high-x range. These results are interpreted in the context of spin fluctuations, hybridization, and non-magnetic atomic disorder.

AB - The intermetallic UCu4+x Al8-xcompounds (0.1 ≤ x ≤ 1.95) have remarkable electronic and magnetic properties. The Cu-poor compositions within this x-range are antiferromagnetic (AF). The Néel temperature (TN) drops gradually from ∝ 36 K for x = 0.1 until AF is completely suppressed near x = 1.1, while the Sommerfeld coefficient (γ) increases dramatically with x, reaching a maximum value of 750mJ/molK2 for x = 1.75. Reported in this investigation are magnetoresistance (MR) and magnetic susceptibility (x) measurements at low temperatures (T) and high magnetic fields (B). The isothermal MR data below 40 K crosses over from positive in the low-x to negative in the high-x range. These results are interpreted in the context of spin fluctuations, hybridization, and non-magnetic atomic disorder.

KW - Antiferromagnetism

KW - Heavy fermions

KW - Magnetoresistance

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