Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Quantum-Critical Phenomena I
TT 50.10: Vortrag
Mittwoch, 14. März 2018, 12:15–12:30, H 3005
Investigation of a field induced magnetic transition in the low-dimensional magnet BiCoPO5 — •Margarita Iakovleva1,2, Evgeniia Vavilova2, Hans-Joachim Grafe1, Alexey Alfonsov1, Bernd Büchner1, Yurii Skourski3, Ramesh Nath4, and Vladislav Kataev1 — 1IFW Dresden, Dresden, 01069, Germany — 2KPhTI, Kazan, 420029, Russia — 3HZDR, Dresden, 01328, Germany — 4IISER, Kerala, 695016, India
The frustrated dimeric chain compound BiCoPO5 orders antiferromagnetically at TN = 11 K. Application of an external magnetic field reduces the transition temperature down to T = 0 K at field of HC ≈ 15.3 T [1], which according to theory could be a signature of field driven quantum phase transition [2]. Here we present an investigation of the title compound by means of magnetometry, high-field/frequency electron spin resonance (HF-ESR) and nuclear magnetic resonance (NMR) techniques. The high-field magnetization measurements show no saturation of the magnetic moment up to the highest magnetic field of 60 T. Low-temperature HF-ESR measurements reveal several field-dependent resonance modes. The 31P NMR relaxation rates measured at 9 T exhibit a peak at T = 8 K corresponding to the AFM order. Remarkably, at a magnetic field of 15 T the T-dependence of the relaxation rates shows a contrasting gapped behavior that could indicate the emergence of a new quantum disordered phase of BiCoPO5 with gapped spin excitations above HC.
E. Mathews, et. al., Solid State Commu. 154, 56 (2013)
Rong-Gen Cai, et. al., Phys. Rev. D 92, 086001 (2015)