Spin-dynamics of the Low-dimensional Magnet (CH₃)₂NH₂CuCl₃

Journal Article · Sun Jan 01 00:00:00 EST 2006 · Physica B: Condensed Matter

DOI:https://doi.org/10.1016/j.physb.2006.05.145· OSTI ID:931918

Stone, Matthew B ^[1]; Tian, W. ^[2]; Granroth, Garrett E ^[1]; Lumsden, Mark D ^[1]; Chung, J. -H. ^[3]; Mandrus, David ^[1]; Nagler, Stephen E ^[1]

---

1. ORNL
2. University of Tennessee, Knoxville (UTK)
3. National Institute of Standards and Technology (NIST)

Dimethylammonium copper (II) chloride (also known as DMACuCl{sub 3} or MCCL) is a low dimensional S=12 quantum spin system proposed to be an alternating ferro-antiferromagnetic chain with similar magnitude ferromagnetic (FM) and antiferromagnetic (AFM) exchange interactions. Subsequently, it was shown that the existing bulk measurements could be adequately modeled by considering DMACuCl{sub 3} as independent AFM and FM dimer spin pairs. We present here new inelastic neutron scattering measurements of the spin excitations in single crystals of DMACuCl{sub 3}. These results show significant quasi-one-dimensional coupling, however the magnetic excitations do not propagate along the expected direction. We observe a band of excitations with a gap of {Delta}=0.95 MeV and a bandwidth of 0.82 MeV.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 931918
• Journal Information: Physica B: Condensed Matter, Vol. 385-386; ISSN 0921-4526
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHAINS
CHLORIDES
COPPER
DIMERS
EXCHANGE INTERACTIONS
MAGNETS
NEUTRONS
SCATTERING
SPIN