(C5 H9NH3)2CuBr4: A metal-organic two-ladder quantum magnet
Journal article, 2024
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 (C5H9NH3)2CuBr4 and its deuterated counterpart, which upon its discovery was identified as a candidate two-leg quantum (S=12) 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 and 113 K. The low-temperature structure has a monoclinic unit cell that gives rise to two inequivalent spin ladders. We further confirm the absence of long-range magnetic order down to 30 mK and investigate the implications of this two-ladder structure for the magnetic properties of (C5H9NH3)2CuBr4 by analyzing our own specific-heat and susceptibility data.
Author
J. Philippe
Paul Scherrer Institut
University of Zürich
Frank Elson
Royal Institute of Technology (KTH)
N. P.M. Casati
Paul Scherrer Institut
S. Sanz
Forschungszentrum Jülich
M. Metzelaars
RWTH Aachen University
Forschungszentrum Jülich
O. Shliakhtun
Paul Scherrer Institut
University of Zürich
Ola Kenji Forslund
University of Zürich
Uppsala University
Jakob Lass
Paul Scherrer Institut
Swiss Federal Institute of Technology in Lausanne (EPFL)
T. Shiroka
Paul Scherrer Institut
A. Linden
University of Zürich
Daniel G. Mazzone
Paul Scherrer Institut
J. Ollivier
Institut Laue-Langevin
S. Shin
Paul Scherrer Institut
Marisa Medarde
Paul Scherrer Institut
B. Lake
Technische Universität Berlin
Helmholtz
Martin Månsson
Royal Institute of Technology (KTH)
M. Bartkowiak
Paul Scherrer Institut
B. Normand
Swiss Federal Institute of Technology in Lausanne (EPFL)
Paul Scherrer Institut
Paul Kögerler
RWTH Aachen University
Yasmine Sassa
Chalmers, Physics, Materials Physics
Marc Janoschek
University of Zürich
Paul Scherrer Institut
Gediminas Simutis
Paul Scherrer Institut
Physical Review B
2469-9950 (ISSN) 2469-9969 (eISSN)
Vol. 110 9 094101Subject Categories
Physical Chemistry
Condensed Matter Physics
DOI
10.1103/PhysRevB.110.094101