Electrical Resistivity and Paramagnetic Resonance in Gadolinium Hexaboride

Coles, B.R.; Cole, T.; Lambe, John; Laurance, N.

doi:10.1088/0370-1328/79/1/312

Cited by 28 publications

(4 citation statements)

References 7 publications

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“…Electron spin resonance (ESR) is the method, which is very useful to investigate spin dynamic in the SG state 36 . It is known from several previous studies that ESR is well observable in the PM phase of GdB 6 as a single absorption line, which continuously broadens with temperature decrease and its position shifts to lower fields 37 – 40 . The resonance absorption in the AFM phase was discovered only recently 41 : the resonance line abruptly transforms to the AFM spectrum with complicated behavior at ν > 39 GHz, while at lower frequencies the line disappears just below T N 41 .…”

Section: Resultsmentioning

confidence: 99%

Role of spin-glass behavior in the formation of exotic magnetic states in GdB6

Semeno

Anisimov

Bogach

et al. 2020

Sci Rep

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Randomness and frustration are believed to be two crucial criteria for the formation of spin glass state. However, the spin freezing occurs in some well-ordered crystals below the related temperature Tf due to the instability of each spin state, which induces the variation of either magnetic moment value or exchange energy. Here we explore the new mechanism of the in-site originated disorder in antiferromagnets Gd0.73La0.27B6 and GdB6, which is caused by the random mutual shifts of Gd3+ spins from the centrally symmetrical positions in the regular cubic lattice. The universal scaling of ESR linewidth temperature dependencies to the power law ΔH(T) ~ ((T − TD)/TD)α with α = − 1.1 ± 0.05 in the paramagnetic phase of both compounds demonstrates the identity of the origin of magnetic randomness. In Gd0.73La0.27B6 the resulting random spin configurations freeze at Tf ≈ 10.5 K where the maximum of magnetization is observed. Below Tf the splitting of ZFC and FC magnetization curves takes place as well as the magnetic state depends on the antecedent sample history. In the case of GdB6 the coherent displacement of Gd ions compete with these random shifts forming an antiferromagnetic (AFM) phase at TN = 15.5 K, which prevails over the spin freezing at Tf ≈ 13 K, expected from the ESR data. The observation of the hysteresis of the ESR spectrum in the AFM phase suggests that its properties may be determined by the competition of two types of AFM orders, which results in formation of stable magnetic domains with nonequivalent positions of AFM Gd pairs at T < 10 K.

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Section: Resultsmentioning

confidence: 99%

Role of spin-glass behavior in the formation of exotic magnetic states in GdB6

Semeno

Anisimov

Bogach

et al. 2020

Sci Rep

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“…[324] As one moves from 2D boron sheets to 3D boron networks of hexaborides and dodecaborides, [317] one soon finds more antiferromagnetic ordering with CeB 6 (T N = 23 K), PrB 6 (T N = 7 K), NdB 6 (T N = 8.6 K), GdB 6 (T N = 18 K), TbB 6 (T N = 23 K), DyB 6 (T N = 21.5 K), HoB 6 (T N = 9 K), HoB 6 (T N = 6.5 K), ErB 6 (T N = 6.5 K), and TmB 6 (T N = 4.2 K). For hexaborides, the antiferromagnetic ordering stems from the coupling between the conduction band and the 4f electrons; [325] there is one free electron per each trivalent metal. [326] Thus, divalent europium in ferromagnetic EuB 6 is the exception.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Rediscovering the Crystal Chemistry of Borides

2017

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For decades, borides have been primarily studied as crystallographic oddities. With such a wide variety of structures (a quick survey of the Inorganic Crystal Structure Database counts 1253 entries for binary boron compounds!), it is surprising that the applications of borides have been quite limited despite a great deal of fundamental research. If anything, the rich crystal chemistry found in borides could well provide the right tool for almost any application. The interplay between metals and the boron results in even more varied material's properties, many of which can be tuned via chemistry. Thus, the aim of this review is to reintroduce to the scientific community the developments in boride crystal chemistry over the past 60 years. We tie structures to material properties, and furthermore, elaborate on convenient synthetic routes toward preparing borides.

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“…B.R. Coles et al [21] measure the paramagnetic resonance and the electrical resistivity on the Gadolinium Hexaboride in multiple temperature ranges. The incidence of research on gadolinium equipment and devices is low, so articles on gadolinium motors are in very small numbers.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 consists of a bibliometric network [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] which presents the trends on the focal points on gadolinium motors from 2014 to 2020. Around 2014, the main interests were corelated with the type of simulation that the gadolinium motor was used in, and as an important characteristic the thermal conductivity was highlighted.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Low-Speed Drive System Using Intelligent Materials

et al. 2021

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This paper presents a low speed drive system with a simple and reliable construction, which can be used in an area where there is no power supply (isolated areas, forests, agricultural fields, etc.) and which operates on the basis of two heat sources, one from solar radiation and one provided by water. Alternatively, this system can be used to recover energy from wastewater from industry. The operation and role of the parameters that can influence the value of the rotation speed of the drive system are analyzed through a simulation, maintaining a constant speed in the case of the prototype is achieved through the control system because in real situations the temperature of heat sources can vary within certain limits. The models and tests performed highlight the parameters of the analyzed drive system and the limits of the range in which its speed can vary.

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Electrical Resistivity and Paramagnetic Resonance in Gadolinium Hexaboride

Cited by 28 publications

References 7 publications

Role of spin-glass behavior in the formation of exotic magnetic states in GdB6

Role of spin-glass behavior in the formation of exotic magnetic states in GdB6

Rediscovering the Crystal Chemistry of Borides

Analysis of a Low-Speed Drive System Using Intelligent Materials

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