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Magnetic ordering and frustration in hexagonal UNi{sub 4}B

Abstract

We have determined unusual magnetic ordering of the hexagonal intermetallic uranium compound UNi{sub 4}B via neutron diffraction. In the easy basal plane the U-moments have triangular symmetry with antiferromagnetic interactions. Along the hard c axis ferromagnetic coupling occurs. Below T{sub N} = 20 K only two out of every three U-moments of 1.2 {mu}{sub B} order in vortex-like arrangements around the third paramagnetic spin. This novel magnetic structure is related to the occurrence of a crystallographic superstructure. Previously observed anomalies in bulk properties below T{sub N} are attributed to unconventional spin-wave excitations associated with this type of ordering. (orig.).
Authors:
Mentink, S A.M.; [1]  Drost, A; [2]  Nieuwenhuys, G J; [1]  Frikkee, E; [2]  Menovsky, A A [1] 
  1. Rijksuniversiteit Leiden (Netherlands). Kamerlingh Onnes Lab.
  2. Netherlands Energy Research Foundation (ECN), Petten (Netherlands)
Publication Date:
May 01, 1994
Product Type:
Technical Report
Report Number:
ECN-RX-94-038
Reference Number:
SCA: 360104; PA: AIX-27:010225; EDB-96:037158; NTS-96:013135; SN: 96001538645
Resource Relation:
Other Information: PBD: May 1994
Subject:
36 MATERIALS SCIENCE; BORON ALLOYS; MAGNETIC PROPERTIES; NICKEL ALLOYS; URANIUM ALLOYS; ANTIFERROMAGNETIC MATERIALS; HEXAGONAL LATTICES; INTERMETALLIC COMPOUNDS; NEUTRON DIFFRACTION; TERNARY ALLOY SYSTEMS
OSTI ID:
183923
Research Organizations:
Netherlands Energy Research Foundation (ECN), Petten (Netherlands)
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Other: ON: DE96611567; TRN: NL95FN020010225
Availability:
INIS; OSTI as DE96611567
Submitting Site:
NLN
Size:
13 p.
Announcement Date:

Citation Formats

Mentink, S A.M., Drost, A, Nieuwenhuys, G J, Frikkee, E, and Menovsky, A A. Magnetic ordering and frustration in hexagonal UNi{sub 4}B. Netherlands: N. p., 1994. Web.
Mentink, S A.M., Drost, A, Nieuwenhuys, G J, Frikkee, E, & Menovsky, A A. Magnetic ordering and frustration in hexagonal UNi{sub 4}B. Netherlands.
Mentink, S A.M., Drost, A, Nieuwenhuys, G J, Frikkee, E, and Menovsky, A A. 1994. "Magnetic ordering and frustration in hexagonal UNi{sub 4}B." Netherlands.
@misc{etde_183923,
title = {Magnetic ordering and frustration in hexagonal UNi{sub 4}B}
author = {Mentink, S A.M., Drost, A, Nieuwenhuys, G J, Frikkee, E, and Menovsky, A A}
abstractNote = {We have determined unusual magnetic ordering of the hexagonal intermetallic uranium compound UNi{sub 4}B via neutron diffraction. In the easy basal plane the U-moments have triangular symmetry with antiferromagnetic interactions. Along the hard c axis ferromagnetic coupling occurs. Below T{sub N} = 20 K only two out of every three U-moments of 1.2 {mu}{sub B} order in vortex-like arrangements around the third paramagnetic spin. This novel magnetic structure is related to the occurrence of a crystallographic superstructure. Previously observed anomalies in bulk properties below T{sub N} are attributed to unconventional spin-wave excitations associated with this type of ordering. (orig.).}
place = {Netherlands}
year = {1994}
month = {May}
}