NMR studies of NbSe sub 3 : Electronic structures, static charge-density-wave measurements, and observations of the moving charge-density wave

Journal Article · Thu Feb 15 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.2722· OSTI ID:6963467

Ross, Jr, J H; Wang, Z; Slichter, C P ^[1]

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1. Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (US)

We describe a series of {sup 93}Nb NMR studies of the charge-density-wave (CDW) conductor NbSe{sub 3}. Using an aligned, multicrystalline sample, we have measured the complete shift tensors for the three Nb sites in the normal state. The results confirm a picture in which one chain is essentially insulating, and the other two are conducting. Studies below the 144-K CDW transition give well-resolved CDW-broadened line shapes, which indicate that the CDW is incommensurate with little or no lock-in to the lattice. Further NMR measurements performed with the CDW driven by electrical currents give information about the moving CDW. Motional narrowing of the NMR line indicates that the CDW conduction phenomena are associated with bulk motion of the NbSe{sub 3} CDW. On the other hand, the motion is irregular at all voltages, as indicated by the large voltage required for motional narrowing, the short {ital T}{sub 2}, and the behavior of the magnetization under current-induced saturation. Furthermore, NMR spin-echo measurements of the low-voltage dielectric response indicate a spatially nonuniform response of the CDW under its pinning barriers.

• DOE Contract Number: AC02-76ER01198
• OSTI ID: 6963467
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:5; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CHALCOGENIDES
CHARGE DENSITY
CRYSTAL STRUCTURE
ELECTRONIC STRUCTURE
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MAGNETIC RESONANCE
NIOBIUM 93
NIOBIUM COMPOUNDS
NIOBIUM ISOTOPES
NIOBIUM SELENIDES
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
RADIOISOTOPES
REFRACTORY METAL COMPOUNDS
RESONANCE
SELENIDES
SELENIUM COMPOUNDS
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
WAVE PROPAGATION
YEARS LIVING RADIOISOTOPES