Field-induced magnetoelastic instabilities in antiferromagnetic molecular wheels

Abstract

The magnetic torque of the antiferromagnetic molecular wheel CsFe8 was studied down to 50 mK and in fields up to 28 T. Below ca. 0.5 K phase transitions were observed at the field-induced level-crossings (LCs). Intermolecular magnetic interactions are very weak excluding an explanation in terms of field-induced magnetic ordering. A magneto-elastic coupling was considered. A generic model shows that the wheel structure is unconditionally unstable at the LCs, and the predicted torque curves explain the essential features of the data well.

4 pages, 3 figures, REVTEX4, to appear in PRL

References in corpus (8)

• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Macroscopic Quantum Coherence in Molecular Magnets
• Elementary excitations in the cyclic molecular nanomagnet Cr8
• Thermodynamics and Spin Tunneling Dynamics in Ferric Wheels with Excess Spin
• Butterfly hysteresis loop at non-zero bias field in antiferromagnetic molecular rings: cooling by adiabatic magnetization
• Mesoscopic quantum coherence in antiferromagnetic molecular clusters
• Quantum-magneto oscillations in a supramolecular Mn(II)-[3 x 3] grid
• Magneto-elastic instability in Molecular Antiferromagnetic Rings

Cited by in corpus (7)

• Quantized antiferromagnetic spin waves in the molecular Heisenberg ring CsFe${}_8$
• Quantum dynamics of the Neel vector in the antiferromagnetic molecular wheel CsFe8
• Spin Jahn-Teller antiferromagnetism in CoTi${}_2$O${}_5$
• Field-induced level crossings in spin clusters: Thermodynamics and magneto-elastic instability
• Spin-Peierls instabilities of antiferromagnetic rings in a magnetic field
• Huge Transverse Magnetization in the Field-Induced Phase of the Antiferromagnetic Molecular Wheel CsFe8
• Chain Formation by Spin Pentamers in eta-Na9V14O35