TY - JOUR
T1 - Zero-field magnetic structure and metamagnetic phase transitions of the cobalt chain compound Li2CoCl4
AU - Riedel, Zachary W.
AU - Jiang, Zhihao
AU - Avdeev, Maxim
AU - Schleife, André
AU - Shoemaker, Daniel P.
N1 - We acknowledge the support of the Australian Centre for Neutron Scattering, ANSTO, and the Australian Government through the National Collaborative Research Infrastructure Strategy in supporting the neutron research infrastructure used in this work via ACNS Proposal No. 13233. Part of this work was supported by the U.S. DOE, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-SC0022060. The authors acknowledge the use of facilities and instrumentation supported by NSF through the University of Illinois Materials Research Science and Engineering Center DMR-1720633. This work made use of the Illinois Campus Cluster, a computing resource that is operated by the Illinois Campus Cluster Program (ICCP) in conjunction with the National Center for Supercomputing Applications (NCSA) and which is supported by funds from the University of Illinois at Urbana-Champaign. Z.W.R. was supported by the National Science Foundation under Grant No. DGE-1922758.
PY - 2023/10
Y1 - 2023/10
N2 - Exploring the uncharacterized magnetic phases of Co2+ chain compounds is critical for finding new low-dimensional magnets hosting quantized excitations. We map the unexplored magnetic phases of the Co2+ chain compound Li2CoCl4. Magnetometry reveals magnetic ordering below 7 K with a metamagnetic transition near 16.5 kOe and a gradual transition to a field-aligned paramagnetic state above 31 kOe. Curie-Weiss fits to the high-temperature susceptibility reveal a high-spin (spin-32) state for cobalt. Heat capacity data, though, give a magnetic entropy change of 5.46 J/mol, consistent with cobalt effective spin-12 systems. To characterize the zero-field antiferromagnetic ordering, we separately calculated the energy of proposed magnetic structures with density functional theory and collected 3.5 K neutron diffraction data, finding that Li2CoCl4 has ferromagnetic chains with antiferromagnetic interactions between them. Increasing field rotates these spin chains, producing the antiferromagnetic to intermediate to paramagnetic transition sequence.
AB - Exploring the uncharacterized magnetic phases of Co2+ chain compounds is critical for finding new low-dimensional magnets hosting quantized excitations. We map the unexplored magnetic phases of the Co2+ chain compound Li2CoCl4. Magnetometry reveals magnetic ordering below 7 K with a metamagnetic transition near 16.5 kOe and a gradual transition to a field-aligned paramagnetic state above 31 kOe. Curie-Weiss fits to the high-temperature susceptibility reveal a high-spin (spin-32) state for cobalt. Heat capacity data, though, give a magnetic entropy change of 5.46 J/mol, consistent with cobalt effective spin-12 systems. To characterize the zero-field antiferromagnetic ordering, we separately calculated the energy of proposed magnetic structures with density functional theory and collected 3.5 K neutron diffraction data, finding that Li2CoCl4 has ferromagnetic chains with antiferromagnetic interactions between them. Increasing field rotates these spin chains, producing the antiferromagnetic to intermediate to paramagnetic transition sequence.
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U2 - 10.1103/PhysRevMaterials.7.104405
DO - 10.1103/PhysRevMaterials.7.104405
M3 - Article
AN - SCOPUS:85174810406
SN - 2475-9953
VL - 7
JO - Physical Review Materials
JF - Physical Review Materials
IS - 10
M1 - 104405
ER -