Hamburg 2001 – scientific programme

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TT: Tiefe Temperaturen

TT 6: Postersitzung I: Josephsonkontakte und SQUIDs, Supraleitung: Theorie, Korrelierte Elektronen, Niederdimensionale Systeme, Magnetotransport, Quantenhalleffekt, Kohlenstoff-Nanoröhrchen, Quantenflüssigkeiten

TT 6.49: Poster

Monday, March 26, 2001, 14:30–17:00, Rang S\ 3

²³Na / ⁵¹V NMR study in Na_1−x Li_x V₂ O₅ — •Husam Ahmad Hussein Mohammad, Rüdiger Michalak, Matthias Dischner, and Frank Steglich — Max Planck Institute for Chemical Physics of Solids,Nöthnitzer Str. 40 ,01187 Dresden, Germany

Sodium vanadate has been proposed to undergo a charge ordering and a Spin Peierls transition at about 34K. Lithium doping of 0.0034 reduces the transition temperature to about 32K. We studied the temperature dependence of the ²³Na / ⁵¹V NMR line position for a single crystal of this compound. The external magnetic field has been applied parallel to the crystallographic a and c axis, respectively. Below T_c for H₀ parallel to a, the ²³Na line splits into several lines of different intensities while the original line persists to 5K . Above T_c and H₀ parallel to a, there is a single ⁵¹V line which represents the V^4.5+ state. This site exists to well below T_c. In addition, below T_c a V2 and V3 site appear; they are shifted by 70 and 120 KHz, respectively, towards lower frequencies.