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 demonstrates 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.

arXiv comment12 pages, 12 figures

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Cited by in corpus (2)

• Magnetoelastic interaction in the two-dimensional magnetic material MnPS${}_3$ studied by first principles calculations and Raman experiments
• Magnetic phases and zone-folded phonons in a frustrated van der Waals magnet