Antiferromagnetic Resonance in GdB6

Semeno, A. V.; Gilmanov, M. I.; Sluchanko, N. E.; Shitsevalova, N. Yu.; Филипов, В. Б.; Demishev, S. V.

doi:10.1134/s0021364018160087

Cited by 10 publications

(7 citation statements)

References 30 publications

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“…The sample of GdB 6 is identical to those ones studied previously in transport (Fig. 1 b) and ESR measurements 33 , 41 . The quality of both crystals is verified by the X-ray diffraction technique, microprobe analysis and SEM.…”

Section: Methodsmentioning

confidence: 81%

“…In its turn, the hysteretic properties of ESR absorption suggest the coexistence in AFM2 phase of domains with different types of magnetic structure. Four lines resonance structure develops below T ≤ 12 K 41 and the resonance “sweep up” spectra become different from that “sweep down” ones in the range 4.2 K ≤ T < 10 K . (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…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 . It is remarkable that the line width in PM phase does not diverge down to Neel temperature T N = 15.5 K. In the PM phase of Gd 0.73 La 0.27 B 6 ESR line temperature behavior is similar to the case of GdB 6 .…”

Section: Resultsmentioning

confidence: 99%

“…This is reflected in the redistribution of the sum absorption intensity between different resonance lines, while the total intensity of integral spectrum remains constant. It was assumed in the previous study that ESR spectrum in AFM phase is determined by low-symmetrical crystal field arising due to the shift of Gd 3+ ions 41 . However, the change in line intensity can hardly be explained within the framework of this hypothesis.…”

Section: Resultsmentioning

confidence: 99%

“…The absence of the satellites of the second structure may be caused by small volume of the corresponding domain as well as the complexity of the neutron experiment in GdB 6 27 , 28 . The considerable difference in domains volumes can be seen from the difference of intensities of the corresponding lines, which takes place at all frequencies 41 .

Figure 6 Hysteretic behavior of ESR in AFM2 phase of GdB 6 .…”

Section: Resultsmentioning

confidence: 99%

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

Semeno

Anisimov

Bogach

et al. 2020

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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: Methodsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%