Unconventional field induced phases in a quantum magnet formed by free radical tetramers

We report experimental and theoretical studies on the magnetic and thermodynamic properties of NIT-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...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Jg. 97; H. 6
Hauptverfasser: Saúl, Andrés, Gauthier, Nicolas, Askari, Reza Moosavi, Côté, Michel, Maris, Thierry, Reber, Christian, Lannes, Anthony, Luneau, Dominique, Nicklas, Michael, Law, Joseph M, Green, Elizabeth Lauren, Wosnitza, Jochen, Bianchi, Andrea, Feiguin, Adrian
Format: Journal Article
Sprache:Englisch
Veröffentlicht: American Physical Society 20.02.2018
Schlagworte:
Condensed Matter
Physics
ISSN:1098-0121, 1550-235X
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Beschreibung
Zusammenfassung:We report experimental and theoretical studies on the magnetic and thermodynamic properties of NIT-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.
ISSN:1098-0121
1550-235X
DOI:10.1103/physrevb.97.064414