Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Correlated Electrons: Quantum-Critical Phenomena - Experiment II
TT 55.2: Vortrag
Mittwoch, 2. April 2014, 11:30–11:45, HSZ 204
Spin dynamics in the Haldane compound SrNi2V2O8 — Vladimir Gnezdilov1,2, •Peter Lemmens1, Anup Kumar Bera3, ATM Nazmul Islam3 und Bella Lake3 — 1TU-BS, Braunschweig — 2ILTPE NAS, Ukraine — 3HZBME, Helmholtz-Zentrum, Berlin
We present a Raman scattering study of the quasi-one-dimensional Haldane chain compound SrNi2V2O8. In contrast to simple expectations, complex temperature-dependent magnetic excitations exist. Our observations provide strong evidence that SrNi2V2O8 is indeed close to the phase boundary that separates a spin-liquid and an Ising-like ordered state on the Sakai-Takahashi phase diagram.