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

S. Süllow; B. Ludoph; B. Becker; G. J. Nieuwenhuys; A. A. Menovsky; J. A. Mydosh

doi:10.1103/PhysRevB.56.846

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

S. Süllow, B. Ludoph, B. Becker, G. J. Nieuwenhuys, A. A. Menovsky, J. A. Mydosh

DOI 10.1103/PhysRevB.56.846 · Physical Review B

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Abstract

We present bulk properties (resistivity, specific heat, and susceptibility) of the quasiternary system UPd2(Al1−xGax)3 and derive the superconducting and magnetic phase diagrams. For low Ga substitution (x<~0.25) a complete suppression of superconductivity is found, while the magnetic properties are hardly affected. For larger x the magnetic transition temperature TN gradually decreases, and the mass enhancement of the electrons increases, until at x=0.8–0.9 a crystallographic transition takes place from the PrNi2Al3 to the BaB2Pt3 lattice. At the structural transition TN discontinuously increases, while the electronic specific heat γ 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 UPd2Al3 with Ga suggests an unconventional mechanism of superconductivity, most probably related to spin fluctuations mediating the pairing.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UPd2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.89	Pressure not reported	unknown
UPd2Al2.70Ga0.05 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.64	Pressure not reported	unknown
UPd2Al2.60Ga0.12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.51	Pressure not reported	unknown
UPd2Al2.73Ga0.20 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.15	Pressure not reported	unknown
UPd2Al2.57Ga0.29 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.52	Pressure not reported	unknown
UPd2Al2.46Ga0.41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.76	Pressure not reported	unknown
UPd2Al2.27Ga0.55 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.33	Pressure not reported	unknown