Unconventional field induced phases in a quantum magnet formed by free radical tetramers - Archive ouverte HAL
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2018

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

Abstract

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.
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hal-01970669 , version 1 (05-01-2019)

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Andrés Saúl, Nicolas Gauthier, Reza Moosavi Askari, Michel Côté, Thierry Maris, et al.. Unconventional field induced phases in a quantum magnet formed by free radical tetramers. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2018, 97 (6), ⟨10.1103/physrevb.97.064414⟩. ⟨hal-01970669⟩
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