Superconductivity and magnetism in heavy-fermion UPd{sub 2}(Al,Ga){sub 3}

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.846· OSTI ID:531830

Suellow, S; Ludoph, B; Becker, B; Nieuwenhuys, G J; Menovsky, A A; Mydosh, J A ^[1]

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1. Kamerlingh Onnes Laboratory, Leiden University, 2300 RA Leiden (The Netherlands)

We present bulk properties (resistivity, specific heat, and susceptibility) of the quasiternary system UPd{sub 2}(Al{sub 1{minus}x}Ga{sub x}){sub 3} and derive the superconducting and magnetic phase diagrams. For low Ga substitution (x{le}0.25) a complete suppression of superconductivity is found, while the magnetic properties are hardly affected. For larger x the magnetic transition temperature T{sub N} gradually decreases, and the mass enhancement of the electrons increases, until at x=0.8{endash}0.9 a crystallographic transition takes place from the PrNi{sub 2}Al{sub 3} to the BaB{sub 2}Pt{sub 3} lattice. At the structural transition T{sub N} discontinuously increases, while the electronic specific heat {gamma} 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{sub 2}Al{sub 3} with Ga suggests an unconventional mechanism of superconductivity, most probably related to spin fluctuations mediating the pairing. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 531830
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ELECTRIC CONDUCTIVITY
GALLIUM ALLOYS
MAGNETIC SUSCEPTIBILITY
MAGNETISM
PALLADIUM ALLOYS
PHASE DIAGRAMS
SPECIFIC HEAT
SUPERCONDUCTIVITY
URANIUM ALLOYS