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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.60: Poster

Thursday, March 29, 2012, 15:00–19:00, Poster B

NMR on the quasi two-dimensional antiferromagnet Ba(Ni1−xMgx)2V2O8 — •Dirk Waibel1, Thomas Wolf2, Hilbert v. Löhneysen1,2, and Bernd Pilawa11Karlsruher Institut für Technologie, Physikalisches Institut, 76131 Karlsruhe — 2Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe

Magnetic-field dependent NMR measurements in the quasi two-dimensional (2D) antiferromagnet (AF) Ba(Ni1−xMgx)2V2O8 have been performed for Bc and Bc at 2 K and 79 MHz. The spin echo signal of the 51V nuclei in the undoped sample consists of one distinct peak for Bc which is split into three lines for Bc. The signals of the 51V nuclei significantly broaden upon doping. Futhermore, the 51V nuclear spin-lattice relaxation rate T1−1 has been measured over a temperature range from 6 K to 300 K at 7 T and 79 MHz revealing a strong increase of the T1−1 rate at TN = 47.4 K. This divergent behavior has been analyzed for Bc and Bc in the context of the 2D topological Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Also, the oscillatory decay of the spin echo due to the quadrupole interaction of the 51V (I=7/2) nuclei is clearly visible in the temperature range from 50 K to 300 K.

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