Unconventional field induced phases in a quantum magnet formed by free radical tetramers
Unconventional field induced phases in a quantum magnet formed by free radical tetramers
Saúl, A.; Gauthier, N.; Askari, R. M.; Coté, M.; Maris, T.; Reber, C.; Lannes, A.; Luneau, D.; Nicklas, M.; Law, J. M.; Green, E. L.; Wosnitza, J.; Bianchi, A. D.; Feiguin, A.
Abstract
We report experimental and theoretical studies on themagnetic and thermodynamic properties ofNIT-2Py, a free radical based organic magnet. From magnetization and specific-heat measurements we establish the temperature versus magnetic field phase diagram which includes two Bose-Einstein condensates (BEC) and an infrequent half-magnetization plateau. Calculations based on density functional theory demonstrate that magnetically this system can be mapped to a quasi-two-dimensional structure of weakly coupled tetramers. Density matrix renormalization group calculations show the unusual characteristics of the BECs where the spins forming the low-field condensate are different than those participating in the high-field one.
Involved research facilities
- High Magnetic Field Laboratory (HLD)
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Physical Review B 97(2018), 064414
DOI: 10.1103/PhysRevB.97.064414
Cited 5 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-27140