(C\(_5\)H\(_9\)NH\(_3\))\(_2\)CuBr\(_4\): a metal-organic two-ladder quantum magnet

Low-dimensional quantum magnets are a versatile materials platform for studying the emergent many-body physics and collective excitations that can arise even in systems with only short-range interactions. Understanding their low-temperature structure and spin Hamiltonian is key to explaining their m...

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Published in:arXiv.org 2024-04
Main Authors: Philippe, J, Elson, F, Casati, M P N, Sanz, S, Metzelaars, M, Shliakhtun, O, slund, O K, Lass, J, Shiroka, T, Linden, A, Mazzone, D G, Ollivier, J, Shin, S, Medarde, M, Lake, B, Mansson, M, Bartkowiak, M, Normand, B, Kögerler, P, Sassa, Y, Janoschek, M, Simutis, G
Format: Article
Language:English
Subjects:
Coordination compounds
Crystal growth
Deuteration
Ladders
Low temperature
Magnetic properties
Magnets
Phase transitions
Single crystals
Unit cell
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Summary:Low-dimensional quantum magnets are a versatile materials platform for studying the emergent many-body physics and collective excitations that can arise even in systems with only short-range interactions. Understanding their low-temperature structure and spin Hamiltonian is key to explaining their magnetic properties, including unconventional quantum phases, phase transitions, and excited states. We study the metal-organic coordination compound (C\(_5\)H\(_9\)NH\(_3\))\(_2\)CuBr\(_4\) and its deuterated counterpart, which upon its discovery was identified as a candidate two-leg quantum (\(S = 1/2\)) spin ladder in the strong-leg coupling regime. By growing large single crystals and probing them with both bulk and microscopic techniques, we deduce that two previously unknown structural phase transitions take place between 136 K and 113 K. The low-temperature structure has a monoclinic unit cell giving rise to two inequivalent spin ladders. We further confirm the absence of long-range magnetic order down to 30 mK and discuss the implications of this two-ladder structure for the magnetic properties of (C\(_5\)H\(_9\)NH\(_3\))\(_2\)CuBr\(_4\).
ISSN:2331-8422