Competition of Spin Fluctuations and Phonons in Superconductivity of ZrZn2

D. J. Singh; I. I. Mazin

doi:10.1103/PhysRevLett.88.187004

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Competition of Spin Fluctuations and Phonons in Superconductivity of ZrZn2

D. J. Singh, I. I. Mazin

DOI 10.1103/PhysRevLett.88.187004 · Physical Review Letters

T1

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Abstract

It has long been suspected that spin fluctuations in ZrZn2 may lead to a triplet superconductivity. We point out another possibility, an inhomogeneous singlet (Fulde-Ferrell) state. We calculated the electronic structure, as well as the zone center phonons and their coupling with electrons. We find that the exchange splitting is nonuniform and the Fermi surface exhibits substantial nesting. Both factors favor a Fulde-Ferrell state at parts of the Fermi surface. We find a substantial coupling of Zr rattling modes with electrons, which can provide the necessary pairing in the s-channel.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
ZrZn2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	Pressure not reported	unknown
ZrZn2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.3	Pressure not reported	unknown