Quantum phase transitions probed by EPR spectra in dimeric spin arrays with supramolecular couplings.
CALVO, Rafael Beretta; SARTORIS, Rosana Patricia; NASCIMENTO, Otaciro Rangel; SEDIVY, Matus; SOJKA, Antonin; NEUGEBAUER, Petr; SANTANA, Vinicius Tadeu.
CALVO, Rafael Beretta; SARTORIS, Rosana Patricia; NASCIMENTO, Otaciro Rangel; SEDIVY, Matus; SOJKA, Antonin; NEUGEBAUER, Petr; SANTANA, Vinicius Tadeu.
Abstract: Dimeric compounds with nearly isolated molecular units (d-units) having pairs of spins s1 and s2 coupled by antiferromagnetic (AFM) exchange H0 = -J0s1*s2 are non-trivial quantum spin systems having primary roles in magnetism. Weakly coupled infinite arrays of AFM d-units in crystal structures have an appealing spin dynamic arising from their energy-gapped level structure and display magnetic properties with important roles in materials science. They received great additional attention when it was discovered that the spin entanglement introduced by interdimeric couplings with magnitude J1 (with We describe procedures to identify and quantify the U-peak and the merging and narrowing phenomena, with a protocol to extract the interdimeric coupling magnitude. As a novel contribution, we explain the experimental results by proposing a spin model with a microscopic flip-flop mechanism involving the absorption and emission of two simultaneous spin-one excitations having energy
@article={003122476,author = {CALVO, Rafael Beretta; SARTORIS, Rosana Patricia; NASCIMENTO, Otaciro Rangel; SEDIVY, Matus; SOJKA, Antonin; NEUGEBAUER, Petr; SANTANA, Vinicius Tadeu.},title={Quantum phase transitions probed by EPR spectra in dimeric spin arrays with supramolecular couplings},journal={Coordination Chemistry Reviews},note={v. 480, p. 215007-1-215007-25},year={2023}}