Electron Spin Resonance in Strongly Correlated Metals

Demishev, S. V.

doi:10.1007/s00723-020-01203-3

Cited by 19 publications

(3 citation statements)

References 115 publications

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“…The ESR measurements have been done using the setup based on Agilent PNA network analyzer 68 . Method for cavity measurements of strongly correlated metals, where samples are fixed as a part of the bottom plate of the cylindrical cavity 69 – 72 was applied. Experiments were carried out in cylindrical cavity operating on TE 011 mode at the frequency ν = 60 GHz.…”

Section: Methodsmentioning

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: Methodsmentioning

confidence: 99%

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

Semeno

Anisimov

Bogach

et al. 2020

Sci Rep

Self Cite

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“…In contrast,

of line 1 in the temperature range of 330 K

400 K decreases linearly, and then, after approaching Curie temperature, the linewidth starts to increase. This behaviour of

around

is typical for ferromagnetic metals [ 31 ]. The high temperature EMR signal for NC5MI within temperature range 395 K

450 K can be also divided into two lines, but the linewidth for NC5MI ( Figure 5 b) has a different character than the temperature dependence for NC0MI.…”

Section: Resultsmentioning

confidence: 87%

Cobalt Content Effect on the Magnetic Properties of Ni50-xCoxMn35.5In14.5 Annealed Ribbons

et al. 2021

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We present a study of the annealing effect and its influence on magnetic and structural properties for a series of Heusler alloys Ni50−xCoxMn35.5In14.5 (x=0,3,5) prepared in ribbon form. We studied the morphology and composition using scanning electron microscopy (SEM) equipped with an X-ray microanalyzer (EDX). The magnetic properties were determined by two methods: electron magnetic resonance (EMR) and vibrating sample magetometer (VSM). We found that cobalt content in the annealed samples reveals an additional magnetic phase transition at lower temperatures.

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“…Those semiquantitative analyses is suitable only for a typical ferromagnet, but not for metamagnetic HCS. Thus, it is necessary to search some microscopic evidence for magnetic polaron, which can be probed by different kinds of method such as muon spin rotation, , Raman scattering, and nuclear magnetic resonance. , ESR is also a powerful technique to detect magnetic polaron; − therefore, we present temperature-dependent ESR spectra of single crystal in the following. Figure a–c displays ESR spectra at some representative points in the low, intermediate, and high temperature ranges, respectively.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Field-driven Insulator–Metal Transition and Colossal Magnetoresistance of Metamagnetic Semiconductor Mercury Thiodichromite Crystals

Xie,

Guo,

Tong

et al. 2024

Inorg. Chem.

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A facile method is developed to efficiently prepare metamagnetic mercury thiodichromite (HgCr 2 S 4 , HCS) polycrystals and single crystals, and their transport properties are studied. The resistivity of the as-prepared HCS polycrystal shows a semiconducting behavior and no magnetic field dependence in the whole temperature range. In contrast, the annealing treatment of the HCS polycrystal induces gigantic changes: an insulator−metal transition is driven by a magnetic field of 5 T, leading to colossal magnetoresistance (CMR) as high as ∼10 4 . The HCS single crystal grown by a newly developed facile method displays similar properties with a larger CMR up to 10 6 −10 7 . First-principles calculation demonstrates a large spin splitting of band structures, providing the possibility of magnetic polaron existence, which is further evidenced by electron spin resonance spectra. Thus, the insulator−metal transition and CMR can be explained in a magnetic polaronic scenario. This work opens a new window for CMR-based spintronics.

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Electron Spin Resonance in Strongly Correlated Metals

Cited by 19 publications

References 115 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

Cobalt Content Effect on the Magnetic Properties of Ni50-xCoxMn35.5In14.5 Annealed Ribbons

Magnetic Field-driven Insulator–Metal Transition and Colossal Magnetoresistance of Metamagnetic Semiconductor Mercury Thiodichromite Crystals

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