Dispersionless Spin Waves and Underlying Field-Induced Magnetic Order in Gadolinium Gallium Garnet

d’Ambrumenil, N.; Petrenko, O. A.; Mutka, H.; Deen, P. P.

doi:10.1103/physrevlett.114.227203

Cited by 32 publications

(55 citation statements)

References 24 publications

(41 reference statements)

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“…23. Three dispersionless low-lying excitations are observed at 0.06, 0.1, and 0.7 meV entirely consistent with dispersionless excitations observed in GGG and assigned to the director state [6,26]. Detailed analysis of the excitation spectra will be published elsewhere.…”

Section: A Reverse Monte Carlosupporting

confidence: 75%

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Emergent magnetic behavior in the frustrated Yb3Ga5O12 garnet

et al. 2021

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Section: A Reverse Monte Carlosupporting

confidence: 75%

“…where S n (r) are unit-length spins on the ten-ion loop with the center in rc. The director state was found to display longrange correlations in GGG and governs both the magnetic structure [5] and magnetic dynamics [6] into the high-field regime. The director state is derived from anisotropy and near-neighbor exchange.…”

Section: Introductionmentioning

confidence: 99%

Emergent magnetic behavior in the frustrated Yb3Ga5O12 garnet

et al. 2021

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“…This indicates that a part of the magnetic moment does not align with the applied field. This effect was already pointed out in GGG, where it was shown to be associated with a canting of the moments due to the long-range dipolar interactions [24].…”

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confidence: 87%

“…This suggests that the boundaries of the field-induced phase diagram in the Gd garnet family are governed by J 1 . Other couplings are, however, expected to influence the exact structure and dynamics in each phase [24].…”

mentioning

confidence: 99%

Absence of magnetic ordering and field-induced phase diagram in the gadolinium aluminum garnet

et al. 2017

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The robustness of spin liquids with respect to small perturbations, and the way magnetic frustration can be lifted by slight changes in the balance between competing magnetic interactions, remains a rich and open issue. We address this question through the study of the gadolinium aluminum garnet Gd 3 Al 5 O 12 , a related compound to the extensively studied Gd 3 Ga 5 O 12 . We report on its magnetic properties at very low temperatures. We show that despite a freezing at about 300 mK, no magnetic transition is observed, suggesting the presence of a spin-liquid state down to the lowest temperatures, similarly to Gd 3 Ga 5 O 12 , in spite of a larger ratio between exchange and dipolar interactions. Finally, the phase diagram as a function of field and temperature is strongly reminiscent of the one reported in Gd 3 Ga 5 O 12 . This study reveals the robust nature of the spin-liquid phase for Gd ions on the garnet lattice, in stark contrast to Gd ions on the pyrochlore lattice for which a slight perturbation drives the compound into a range of magnetically ordered states. DOI: 10.1103/PhysRevB.96.220413 In the last few decades, great interest has been devoted to the study of frustrated systems. In particular, in geometrically frustrated magnetic systems, a competition between exchange energies is induced by the geometry of the lattice. It prevents conventional magnetic ordering, resulting in exotic correlations and ground states that can remain disordered down to zero temperature [1]. Additional perturbations such as exchange interactions beyond the nearest-neighbor exchange, dipolar interactions, quantum fluctuations, or disorder can then play a crucial role and select a unique ground state in the system. The characterization of the robustness of the frustrated ground states with respect to these perturbations is thus an important question.Among the lattices that are prone to exhibit magnetic frustration, an interesting example is the hyperkagome structure, a three-dimensional lattice of corner-sharing triangles. Few realizations of such a structure have been discovered. The main examples are the garnets of formula X 3 A 2 B 3 O 12 (with X a magnetic element, and A,B nonmagnetic elements), the iridate compound Na 4 Ir 3 O 8 [2][3][4], and more recently PbCuTe 2 O 6 [5]. While the last two compounds are studied for their properties related to quantum effects, many studies on the frustration in magnetic garnets have focused on the gadolinium gallium garnet GGG (formula Gd 3 Ga 5 O 12 ), considered as an archetypal system to study the classical Heisenberg model with antiferromagnetic interactions on the hyperkagome lattice. The interesting physics in this compound is derived directly from the peculiar structure, Gd ions positioned on two interpenetrating hyperkagome lattices (see Fig. 1), and the effect of the long-range dipolar interactions on the ground state.Experimentally, GGG presents no evidence of conventional long-range ordering down to 25 mK [6]. Short-range correla-* elsa.lhotel@neel.cnrs.fr † Present addr...

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“…Under low magnetic fields, (S)GGG is paramagnetic. When the external field exceeds 1 T, however, a field-induced antiferromagnetic phase can be produced in GGG at temperatures below 1 K [3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Terahertz response of gadolinium gallium garnet (GGG) and gadolinium scandium gallium garnet (SGGG)

Sabbaghi

Hanson

Shi

et al. 2020

Journal of Applied Physics

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We report the magneto-optical response of Gadolinium Gallium Garnet (GGG) and Gadolinium Scandium Gallium Garnet (SGGG) at frequencies ranging from 300 GHz to 1 THz, and determine the material response tensor. Within this frequency window, the materials exhibit nondispersive and low-loss optical responses. At low temperatures, significant THz Faraday rotations are found in the (S)GGG samples. Such strong gyroelectric response is likely associated with the high-spin paramagnetic state of the Gd 3+ ions. A model of the material response tensor is determined, together with the Verdet and magneto-optic constants.

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Dispersionless Spin Waves and Underlying Field-Induced Magnetic Order in Gadolinium Gallium Garnet

Cited by 32 publications

References 24 publications

Emergent magnetic behavior in the frustrated Yb3Ga5O12 garnet

Emergent magnetic behavior in the frustrated Yb3Ga5O12 garnet

Absence of magnetic ordering and field-induced phase diagram in the gadolinium aluminum garnet

Terahertz response of gadolinium gallium garnet (GGG) and gadolinium scandium gallium garnet (SGGG)

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