Investigation of thermal and magnetic properties of defects in a spin-gap compound NaV2O5

Physics – Condensed Matter – Strongly Correlated Electrons

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

6 pages, 8 figures

Scientific paper

10.1103/PhysRevB.63.014412

The specific heat, magnetic susceptibility and ESR signals of a Na-deficient vanadate Na_xV_2O_5 (x=1.00 - 0.90) were studied in the temperature range 0.07 - 10 K, well below the transition point to a spin-gap state. The contribution of defects provided by sodium vacancies to the specific heat was observed. It has a low temperature part which does not tend to zero till at least 0.3 K and a high temperature power-like tail appears above 2 K. Such dependence may correspond to the existence of local modes and correlations between defects in V-O layers. The magnetic measurements and ESR data reveal S=1/2 degrees of freedom for the defects, with their effective number increasing in temperature and under magnetic field. The latter results in the nonsaturating magnetization at low temperature. No long-range magnetic ordering in the system of defects was found. A model for the defects based on electron jumps near vacancies is proposed to explain the observed effects. The concept of a frustrated two-dimensional correlated magnet induced by the defects is considered to be responsible for the absence of magnetic ordering.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Investigation of thermal and magnetic properties of defects in a spin-gap compound NaV2O5 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Investigation of thermal and magnetic properties of defects in a spin-gap compound NaV2O5, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Investigation of thermal and magnetic properties of defects in a spin-gap compound NaV2O5 will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-583919

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.