Quantum critical behavior induced by Mn impurity in CuGeO3

Results of high frequency (60-315 GHz) studies of ESR in CuGeO3 single crystals containing 0.9% of Mn impurity are reported. Quantitative EPR line shape analysis allowed concluding that low temperature magnetic susceptibility for T <40 K diverges following power law with the critical exponent 0.81 and therefore manifests onset of a quantum critical (QC) regime. We argue that transition into Griffiths phase occurs at TG~40 K and disorder produced by Mn impurity in quantum spin chains of CuGeO3 may lead to co-existence of the QC regime and spin-Peierls dimerisation.Comment: 2 pages, submitted to SCES05 proceeding

ВОЗМОЖНЫЕ ПУТИ СОХРАНЕНИЯ СЕМЕНОВОДСТВА ОТЕЧЕСТВЕННЫХ СОРТОВ ГОРОХА ОВОЩНОГО В СОВРЕМЕННЫХ УСЛОВИЯХ

The possible ways of development of seed production of pea in Russia and increasing of competitive growth of domestic pea varieties suitable for processing industry are represented in the article.В статье рассмотрены возможные пути развития отечественного семеноводства гороха овощного и повышения конкурентоспособности отечественных сортов, предназначенных для переработки на «зеленый горошек».