Heavy-fermion superconductivity atT c =2K in the antiferromagnet UPd2Al3

Geibel, C.; Schank, C.; Thies, S.; Kitazawa, Hideaki; Bredl, C. D.; Böhm, A.; Rau, Martin; Grauel, A.; Caspary, R.; Helfrich, R.; Ahlheim, U.; Weber, G.; Steglich, F.

doi:10.1007/bf01453750

Cited by 500 publications

(260 citation statements)

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“…The NFL behavior in these three systems, U 1−x M x Pd 2 Al 3 (M = Th, Y, La), apparently originates from two different mechanisms: an unconventional Kondo effect (M = Th) and fluctuations of an order parameter in the vicinity of an SG QCP (M = Y, La). The parent compound UPd 2 Al 3 has a moderately large electron effective mass m * ≈ 50m e , inferred from an electronic specific heat coefficient γ ≈ 140 mJ/mol K 2 [66], and exhibits the coexistence of AFM order with a Néel temperature T N = 14.6 K and superconductivity with T c ∼ 2 K. The AFM structure consists of an AFM stacking along the c-axis of FM planes with relatively large ordered moments of ∼0.85 μ B lying in the hexagonal basal plane [67]. In the following discussion, we briefly describe the T -x phase diagrams and NFL behavior observed in the Th, Y, and La substituted UPd 2 Al 3 based systems.…”

Section: Y 1−x U X Pdmentioning

confidence: 99%

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

et al. 2010

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Standard models for simple metals and insulators often fail for systems based on elements with unstable d-or f -electron shells, where strong electronic correlations can generate new and unexpected states of matter. Such a scenario can often be induced when a magnetic phase transition is tuned to absolute zero temperature by an external control parameter such as chemical composition, pressure or magnetic field. At the resulting quantum critical point (QCP), emergent phenomena, such as unconventional superconductivity and novel magnetic phases are frequently observed. The temperature and energy dependences of the physical properties are also found to deviate from expectations for a simple Fermi liquid. This "non-Fermi-liquid" (NFL) behavior is commonly manifested as weak power laws and logarithmic divergences in the physical properties at low temperatures and is often found in a V-shaped region near a QCP, which has become the "classic" QCP phase diagram. However, there is also a growing number of materials where the NFL behavior either occurs far away from the QCP, within an ordered phase, or may not be associated with any putative QCP. Thus, after nearly 20 years of research, it remains unknown whether NFL physics is universal, or if a multitude of unique subclasses exist. In this article, we review research that has primarily been carried out in our laboratory on systems that exhibit NFL behavior that does not conform to the "classic" QCP scenario.

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Section: Y 1−x U X Pdmentioning

confidence: 99%

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

et al. 2010

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“…Hexagonal 123 compounds UT 2 M 3 , TϭNi and Pd and M ϭAl or Ga, were the subject of many detailed investigations in recent years for two main reasons: [1][2][3] The first is the appearance of heavy-fermion superconductivity in UNi 2 Al 3 ͑Ref. 1͒ and UPd 2 Al 3 ͑Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Superconductivity and magnetism in heavy-fermion UPd 2 We present bulk properties ͑resistivity, specific heat, and susceptibility͒ of the quasiternary system UPd 2 ͑Al 1Ϫx Ga x ) 3 and derive the superconducting and magnetic phase diagrams. For low Ga substitution (xр0.25) a complete suppression of superconductivity is found, while the magnetic properties are hardly affected.…”

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confidence: 99%

Superconductivity and magnetism in heavy-fermion UPd2(Al,Ga)3

et al. 1997

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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. We present bulk properties ͑resistivity, specific heat, and susceptibility͒ of the quasiternary system UPd 2 ͑Al 1Ϫx Ga x ) 3 and derive the superconducting and magnetic phase diagrams. For low Ga substitution (xр0.25) a complete suppression of superconductivity is found, while the magnetic properties are hardly affected. For larger x the magnetic transition temperature T N gradually decreases, and the mass enhancement of the electrons increases, until at xϭ0.8-0.9 a crystallographic transition takes place from the PrNi 2 Al 3 to the BaB 2 Pt 3 lattice. At the structural transition T N discontinuously increases, while the electronic specific heat ␥ grows smoothly through the transition. We discuss the relationship between the alloying parameter x and the magnetic ordering and electronic hybridization, respectively. The strong suppression of the superconductivity in UPd 2 Al 3 with Ga suggests an unconventional mechanism of superconductivity, most probably related to spin fluctuations mediating the pairing. ͓S0163-1829͑97͒01126-0͔

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“…UPd2AI3 and URu2Siz both undergo transitions to superconductivity from antiferromagnetically ordered states. Indeed, the resistivity, susceptibility, and specific heat for the two compounds are remarkably similar [10,11]. Both have large specificheat anomalies at the N6el transition which occurs at 0921-4526/95/$09.50 ,.C~ 1995 Elsevier Science B.V. All rights reserved SSDI 0921-4526(95)00051-8 12E.…”

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confidence: 98%