Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/173212
Title: Disentangling the magnetic dimensionality of alleged magnetically isolated cuprate spin-ladder CuHpCl system: a long lasting issue
Author: Jornet Somoza, Joaquim
Cosi, F.
Fumanal Quintana, María
Deumal i Solé, Mercè
Keywords: Materials ferromagnètics
Magnetisme
Ferromagnetic materials
Magnetism
Issue Date: 18-Jan-2021
Publisher: Royal Society of Chemistry
Abstract: The Cu2(1,4-diazacycloheptane)2Cl4 (CuHpCl) crystal is a molecular transition metal antiferromagnetic complex, whose magnetism has been a long-lasting issue. The outcome of a variety of experimental studies (on magnetic susceptibility, heat capacity, magnetization, spin gap and INS) reported many different J values depending on the fitting ladder model used. From all available experimental data, one can infer that CuHpCl is a very complex system with many competing microscopic magnetic JAB interactions that lead to its overall antiferromagnetic behavior. A first-principles bottom-up study of CuHpCl is thus necessary in order to fully disentangle its magnetism. Here we incorporate data from ab initio computations providing the magnitude of the JAB interactions to investigate the microscopic magnetic couplings in CuHpCl and, ultimately, to understand the macroscopic magnetic behavior of this crystal. Strikingly, the resulting magnetic topology can be pictured as a 3D network of interacting squared plaquette magnetic building blocks, which does not agree with the suggested ladder motif (with uniform rails) that arises from direct observation of the crystal packing. The computed magnetic susceptibility, heat capacity and magnetization data show good agreement with the experimental data. In spite of this agreement, only the calculated magnetization data are used to discriminate between the different spin regimes in CuHpCl, namely gapped singlet, partially polarized and fully polarized phases. Additional analysis of the magnetic wavefunction enables the conclusion that long-range spin correlation can be discarded as being responsible for the partially polarized phase, whose magnetic response is in fact due to the complex interplay of the magnetic moments in the 3D magnetic topology.
Note: Versió postprint del document publicat a: https://doi.org/10.1039/d0dt03499a
It is part of: Dalton Transactions, 2021
URI: http://hdl.handle.net/2445/173212
Related resource: https://doi.org/10.1039/d0dt03499a
ISSN: 1477-9226
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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