Juxtaposition of spin freezing and long range order in a series of geometrically frustrated antiferromagnetic gadolinium garnets

Quilliam, J. A.; Sun, Meng; Craig, H. A.; Corruccini, L. R.; Petrenko, O. A.; Gómez, Ariel; Kycia, S.; Gingras, Michel J. P.; Kycia, J. B.

doi:10.1103/physrevb.87.174421

Cited by 31 publications

(54 citation statements)

References 52 publications

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“…Evidence for a conventional spin liquid in GGG is the suppression of T g to temperatures far below the antiferromagnetic interaction strength of ∼2 K (14-16), the observation of liquid-like magnetic diffuse scattering in powder neutron-scattering measurements (17), and the persistence of strong spin fluctuations to low temperature (18)(19)(20). Yet, broad anomalies are present in both the non-linear susceptibility χ 3 and the magnetic specific heat at around 0.5 K, which do not yet have a well-understood microscopic origin (13,21).…”

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Hidden order in spin-liquid Gd ₃ Ga ₅ O ₁₂

Paddison

Jacobsen

Petrenko

et al. 2015

Science

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Elucidating order within disorder In some materials, the geometry of the crystal lattice gets in the way of magnetic ordering. Their spins, although magnetically interacting, remain seemingly disordered and form a so-called spin liquid. Paddison et al. propose a different model for the spin-liquid compound Gd 3 Ga 5 O 12 . Neutron diffraction measurements and numerical techniques revealed that even though individual spins in this material were disordered, they formed 10-spin loops that were correlated with one another. The nature of this “hidden order” was such that it escaped direct detection by conventional techniques Science , this issue p. 179

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confidence: 99%

Hidden order in spin-liquid Gd ₃ Ga ₅ O ₁₂

Paddison

Jacobsen

Petrenko

et al. 2015

Science

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“…It allows one to increase the antiferromagnetic exchange interactions by keeping the same magnetic ion and structural properties [19], while the dipolar interactions remain almost constant, making GAG a perfect candidate to address this question. Contrary to GGG, a small peak has been reported in specific heat measurements of GAG at 175 mK, which was attributed to long-range ordering [18].2469-9950/2017/96(22)/220413 (5) 220413-1 …”

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“…[18], suggesting long-range ordering. Our magnetization data do not show evidence for this ordering: Although a small peak is observed in the FC magnetization at about 175 mK, no anomaly is observed both in the ZFC magnetization and the ac susceptibility at this temperature as should be expected in the presence of a magnetic transition towards a long-range ordered state.…”

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confidence: 99%

“…1) which lift the degeneracy of the ground state [17]. In GGG, J 3 is much smaller, thus emphasizing the role of the dipolar interaction.To probe more specifically the sensitivity of the GGG phase diagram with respect to variations in the magnetic couplings, we focus here on another gadolinium garnet Gd 3 Al 5 O 12 (GAG), which has the same hyperkagome structure as GGG but a smaller lattice parameter due to the smaller ionic radii of Al 3+ compared with Ga 3+ ions [18]. It allows one to increase the antiferromagnetic exchange interactions by keeping the same magnetic ion and structural properties [19], while the dipolar interactions remain almost constant, making GAG a perfect candidate to address this question.…”

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confidence: 99%

“…In addition, preliminary neutron scattering measurements at about 60 mK do not provide evidence for conventional ordering. Very-low-temperature specific heat measurements should be performed to check whether the peak in the specific heat reported by Quilliam et al [18] is present in our sample.…”

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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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Exceptional Magnetocaloric Responses in a Gadolinium Silicate with Strongly Correlated Spin Disorder for Sub‐Kelvin Magnetic Cooling

Yang,

Zhang,

Liu

et al. 2024

Advanced Science

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The development of magnetocaloric materials with a significantly enhanced volumetric cooling capability is highly desirable for the application of adiabatic demagnetization refrigerators in confined spatial environments. Here, the thermodynamic characteristics of a magnetically frustrated spin‐7/2 Gd9.33[SiO4]6O2 is presented, which exhibits strongly correlated spin disorder below ≈1.5 K. A quantitative model is proposed to describe the magnetization results by incorporating nearest‐neighbor Heisenberg antiferromagnetic and dipolar interactions. Remarkably, the recorded magnetocaloric responses are unprecedentedly large and applicable below 1.0 K. It is proposed that the S = 7/2 spin liquids serve as versatile platforms for investigating high‐performance magnetocaloric materials in the sub‐kelvin regime, particularly those exhibiting a superior cooling power per unit volume.

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Juxtaposition of spin freezing and long range order in a series of geometrically frustrated antiferromagnetic gadolinium garnets

Cited by 31 publications

References 52 publications

Hidden order in spin-liquid Gd ₃ Ga ₅ O ₁₂

Hidden order in spin-liquid Gd ₃ Ga ₅ O ₁₂

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

Exceptional Magnetocaloric Responses in a Gadolinium Silicate with Strongly Correlated Spin Disorder for Sub‐Kelvin Magnetic Cooling

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Juxtaposition of spin freezing and long range order in a series of geometrically frustrated antiferromagnetic gadolinium garnets

Cited by 31 publications

References 52 publications

Hidden order in spin-liquid Gd 3 Ga 5 O 12

Hidden order in spin-liquid Gd 3 Ga 5 O 12

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

Exceptional Magnetocaloric Responses in a Gadolinium Silicate with Strongly Correlated Spin Disorder for Sub‐Kelvin Magnetic Cooling

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Hidden order in spin-liquid Gd ₃ Ga ₅ O ₁₂

Hidden order in spin-liquid Gd ₃ Ga ₅ O ₁₂