Heavy fermion behavior of U2<i>T</i>2<i>X</i> compounds

Havela, L.; Sechovský, V.; Svoboda, P.; Diviš, M.; Nakotte, H.; Prokeš, K.; Boer, F.R. de; Purwanto, Agus; Robinson, R. A.; Seret, Alain; Winand, J.M.; Rébizant, J.; Spirlet, J.C.; Richter, Manuel; Eschrig, H.

doi:10.1063/1.358314

Cited by 53 publications

(38 citation statements)

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“…[7][8][9][10][11][12] In most cases, the magnetic ground-state properties ͑in the sense of magnetic as opposed to nonmagnetic͒ are in agreement with the results of electronic band-structure calculations. [12][13][14] In addition, these calculations indicate strongly reduced 5 f moments due to 5 fligand hybridization. The experimental determination of the development of the U moments across the U 2 T 2 X series is motivated by these predicted trends.…”

Section: Introductionsupporting

confidence: 74%

“…Antiferromagnetic ordering has been reported for U 2 Ni 2 In, U 2 Pd 2 In, U 2 Ni 2 Sn, U 2 Rh 2 Sn, U 2 Pd 2 Sn, and U 2 Pt 2 Sn, while for the other U 2 T 2 X compounds a nonmagnetic ground state was inferred from susceptibility, electrical-resistivity, and specific-heat measurements. [7][8][9][10][11][12] In most cases, the magnetic ground-state properties ͑in the sense of magnetic as opposed to nonmagnetic͒ are in agreement with the results of electronic band-structure calculations. [12][13][14] In addition, these calculations indicate strongly reduced 5 f moments due to 5 fligand hybridization.…”

Section: Introductionsupporting

confidence: 73%

“…7 U 2 Pt 2 In exhibits a nonmagnetic heavy-fermion ground state ͑with a ␥ value of about 850 mJ/mol K 2 ͒ and U 2 Pt 2 Sn orders antiferromagnetically, 12 but no U moment has been determined by neutron diffraction up to now. In all cases, we find an increased tendency towards long-range magnetic ordering in U 2 T 2 Sn compounds compared with their U 2 T 2 In counterparts.…”

Section: Discussionmentioning

confidence: 99%

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Hybridization effects inU2T2Xcompounds: Magnetic structu

et al. 1996

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Hybridization effects in U2T2X compounds: Magnetic structures of U2Rh 2Sn and U2Ni 2In Nakotte, H.; Purwanto, A.; Robinson, R.A.; Prokes, K.; Klaasse, J.C.P.; de Chatel, P.F.; de Boer, F.R.; Havela, L.; Sechovsky, V.; Pereira, L.C.J.; Seret, A.; Rebizant, J.; Spirlet, J.C.; Trouw, F. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. The tetragonal intermetallic compounds U 2 Ni 2 In and U 2 Rh 2 Sn have been studied by means of specific-heat, electrical-resistivity, and neutron-diffraction techniques. At low temperatures, both compounds order antiferromagnetically in a magnetic unit cell doubled along the c axis, and we find 5 f moments of 0.60 and 0.38 B /U atom for U 2 Ni 2 In and U 2 Rh 2 Sn, respectively. For U 2 Ni 2 In, our refinement also indicates a possible Ni moment of 0.37 B perpendicular to the U moments. We discuss the development of the 5 f moments together with findings on other isostructural U 2 T 2 X ͑Tϭtransition metal, XϭIn, Sn͒ compounds, and confirm that the trends expected due to 5 f -ligand hybridization also hold for this family of uranium compounds. Our analysis indicates different arrangements of the 5 f moments in the two compounds ͑noncollinear arrangement within the basal plane for U 2 Ni 2 In and collinear arrangement along the c axis for U 2 Rh 2 Sn͒, although both compounds have nearest-neighbor U-U distances along the c axis. This would mean that the magnetocrystalline anisotropy in U 2 T 2 X compounds is not determined by nearest-neighbor U-U links alone.

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Section: Introductionsupporting

confidence: 74%

Section: Introductionsupporting

confidence: 73%

Section: Discussionmentioning

confidence: 99%

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Hybridization effects inU2T2Xcompounds: Magnetic structu

et al. 1996

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“…3 Among other isostructural indides, the highest γ = 500 mJ/mol K 2 is observed for non-magnetic heavy fermion system Ce 2 Pt 2 In. 4 To the best of our knowledge, 22,23 In the context of cerium intermetallics Ce 2 Au 2 Cd can be discussed in line with the equiatomic compounds CePdIn (700 mJ/mol K 2 ) and CePtIn (> 500 mJ/mol K 2 ). [24][25][26] In Fig.…”

Section: Specific Heat Studiesmentioning

confidence: 94%

Antiferromagnetic ordering in the heavy-fermion systemCe2Au2Cd

Rayaprol

Pöttgen

2005

Phys. Rev. B

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“…Among the U 2 T 2 X compounds, where T is a transition metal and X is In or Sn, U 2 Pt 2 In takes a special place, because it is a non-ordering heavy-electron compound with a strongly renormalised quasiparticle mass (c/T = 0.41 J/molU-K 2 at T = 1 K) [1]. Moreover, it shows pronounced non-Fermi liquid (NFL) behaviour.…”

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Pressure-induced recovery of the Fermi-liquid state in the non-Fermi liquid material U2Pt2In

Estrela

Visser

Naka

et al. 2002

Physica B: Condensed Matter

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In the study of non-Fermi-liquid (NFL) phenomena in correlated metals, U 2 Pt 2 In is of special interest as it is one of the rare stoichiometric (undoped) materials that show NFL behaviour at ambient pressure. Here we report on the stability of the NFL phase with respect to hydrostatic pressure (p≤ 1.8 GPa). Electrical resistivity data under pressure, taken on a single-crystalline sample for a current in the tetragonal plane, show that T FL , i.e. the temperature below which the Fermi-liquid T 2 -term is observed, increases with pressure as T FL ~ (p-p c ), where p c ≈ 0 is a critical pressure. This provides strong evidence for the location of U 2 Pt 2 In at an antiferromagnetic quantum critical point. A most important conclusion that can be drawn from the data presented in Fig.1, is the recovery of the Fermi-liquid (FL) ∆ρ ~T 2 law at moderate pressures. We have extracted T FL ,i.e. the upper temperature limit for the ∆ρ ~T 2 behaviour, by a least-squares fitting procedure.The pressure variation of T FL is shown in Fig.2 Correspondingly, the coefficient A of the FL T 2 term diverges upon approaching p c . A strong increase of A can be deduced from the data in Fig.1. A more detailed account of our highpressure study can be found elsewhere [7].The large residual resistivity value of our samples brings about the question whether the NFL behaviour in U 2 Pt 2 In is due to Kondo disorder. However, the rapid recovery of the FL behaviour under pressure as probed by the resistivity data for I || a does not support this mechanism. Since the compressibility is isotropic [4], pressure is expected to result in the further broadening of the distribution of Kondo-temperatures and thus the concurrent NFL behavior would prevail.In summary, we have measured the resistivity of the NFL material U 2 Pt 2 In under pressure.For I || a, the FL state is rapidly recovered. T FL is a linear function of the pressure,T FL~( p-p c ), with p c ≈0. This provides strong evidence for the location of U 2 Pt 2 In at an antiferromagnetic quantum critical point.Acknowledgements:

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Heavy fermion behavior of U2T2X compounds

Cited by 53 publications

References 4 publications

Hybridization effects inU2T2Xcompounds: Magnetic structu

Hybridization effects inU2T2Xcompounds: Magnetic structu

Antiferromagnetic ordering in the heavy-fermion systemCe2Au2Cd

Pressure-induced recovery of the Fermi-liquid state in the non-Fermi liquid material U2Pt2In

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