Spin-resonance modes of the spin-gap magnet TlCuCl_3

Abstract

Three kinds of magnetic resonance signals were detected in crystals of the spin-gap magnet TlCuCl_3. First, we have observed the microwave absorption due to the excitation of the transitions between the singlet ground state and the excited triplet states. This mode has the linear frequency-field dependence corresponding to the previously known value of the zero-field spin-gap of 156 GHz and to the closing of spin-gap at the magnetic field H_c of about 50 kOe. Second, the thermally activated resonance absorption due to the transitions between the spin sublevels of the triplet excitations was found. These sublevels are split by the crystal field and external magnetic field. Finally, we have observed antiferromagnetic resonance absorption in the field-induced antiferromagnetic phase above the critical field H_c. This resonance frequency is strongly anisotropic with respect to the direction of the magnetic field.

v.2: typo correction (one of the field directions was misprinted in the v.1)

References in corpus (9)

• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Observation of Field-Induced Transverse Néel Ordering in the Spin Gap System TlCuCl${}_3$
• Specific Heat Study of the Field-Induced Magnetic Ordering in the Spin Gap System TlCuCl${}_3$
• Impurity-Induced Antiferromagnetic Ordering in the Spin Gap System TlCuCl_3
• The magnetic ordering in the mixed valence compound beta-Na0.33V2O5
• Paramagnetic and antiferromagnetic resonances in the diamagnetically diluted Haldane magnet PbNi2V2O8
• Separation of the magnetic phases at the Néel point in the diluted spin-Peierls magnet CuGeO3
• Magnetic Resonance of Spin Clusters and Triplet Excitations in a Spin-Peierls Magnet with Impurities

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