Incommensurate magnetic order in the heavy fermion superconductor UNi2Al3

A. Schröder; J. G. Lussier; B. D. Gaulin; J. D. Garrett; W. J. L. Buyers; L. Rebelsky; S. M. Shapiro

doi:10.1103/PhysRevLett.72.136

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Incommensurate magnetic order in the heavy fermion superconductor UNi2Al3

A. Schröder, J. G. Lussier, B. D. Gaulin, J. D. Garrett, W. J. L. Buyers, L. Rebelsky, S. M. Shapiro

DOI 10.1103/PhysRevLett.72.136 · Physical Review Letters

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Abstract

Neutron scattering measurements show UNi2Al3 to be unique among heavy fermion superconductors in that below TN∼5.2 K it displays long range magnetic order which is incommensurate with its chemical lattice. The ordering wave vector is (1/2±δ, 0, 1/2) where δ=0.110±0.003. The measured superlattice intensities are well described by the presence of a longitudinal spin density wave within the hexagonal basal plane, polarized along a*. The magnitude of the maximum ordered moment is found to be very small; μord=(0.24±0.10)μB.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UNi2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1	Pressure not reported	unknown
UPd2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2	Pressure not reported	unknown
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.5	Pressure not reported	unknown
URu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.2	Pressure not reported	unknown