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

Abstract

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

Magnetic phase diagram of CePt3B1−xSix

“…Conceptually, however, the rapid suppression of superconductivity by doping with non-magnetic elements is in line with the ideas and observations about unconventional superconductivity in general (see Refs. [43][44][45][46] ) and in CePt 3 Si specifically.…”

Magnetic phase diagram of CePt3B1-xSix

“…Conceptually, however, the rapid suppression of superconductivity by doping with non-magnetic elements is in line with the ideas and observations about unconventional superconductivity in general (see Refs. [43][44][45][46] ) and in CePt 3 Si specifically. 16,47 Secondly, there is the issue about the relationship between the antiferromagnetic states in CePt 3 B and CePt 3 Si.…”