How and why the characterization of magnetic materials can give directions in the methodological development in high field–high frequency EPR

Brunel, Louis‐Claude; Caneschi, Andréa; Dei, Andrea; Friselli, D.; Gatteschi, Dante; Hassan, Alia; Lenci, Lorenzo; Martinelli, Massimo; Massa, C. A.; Pardi, Luca; Popescu, F. F.; Ricci, I.; Sorace, Lorenzo

doi:10.1163/156856702320267127

Cited by 15 publications

(17 citation statements)

References 32 publications

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“…MWA spectra at each temperature were recorded at fixed selected frequencies (see SM [27] and related Refs. [28][29][30][31] for further technical details of the MWA measurements).…”

Section: B Microwave Absorption Measurementsmentioning

confidence: 99%

Signatures of low-energy fractionalized excitations in α−RuCl3 from field-dependent microwave absorption

et al. 2018

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Topologically ordered states of matter are generically characterized by excitations with quantum number fractionalization. A prime example is the spin liquid realized in Kitaev's honeycomb-lattice compass model where spin-flip excitations fractionalize into Majorana fermions and Ising gauge fluxes. While numerous compounds have been proposed to be proximate to such a spin-liquid phase, clear-cut evidence for fractionalized excitations is lacking. Here we employ microwave absorption measurements to study the low-energy excitations in α-RuCl3 over a wide range of frequencies, magnetic fields, and temperatures, covering in particular the vicinity of the field-driven quantum phase transition where long-range magnetic order disappears. In addition to conventional gapped magnon modes we find a highly unusual broad continuum characteristic of fractionalization whichmost remarkably -extends to energies below the lowest sharp mode and to temperatures significantly higher than the ordering temperature, and develops a gap of a nontrivial origin in strong magnetic fields. Our results unravel the signatures of fractionalized excitations in α-RuCl3 and pave the way to a more complete understanding of the Kitaev spin liquid and its instabilities.

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“…MWA spectra at each temperature were recorded at fixed selected frequencies (see SM [27] and related Refs. [28][29][30][31] for further technical details of the MWA measurements).…”

Section: B Microwave Absorption Measurementsmentioning

confidence: 99%

Signatures of low-energy fractionalized excitations in α−RuCl3 from field-dependent microwave absorption

et al. 2018

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“…High-field and high-frequency ESR measurement is one of the major trends in the ESR spectroscopy recently, because it has several advantages as compared with conventional X-band (~10 GHz) ESR system [1][2][3][4][5][6][7]. The advantages are high resolution of the g-value, observation of a broad line, observation of resonance with a large zerofield splitting, and so on.…”

Section: Introductionmentioning

confidence: 99%

Development of High-Field ESR System Using SQUID Magnetometer and its Application to Measurement under High Pressure

Sakurai¹,

Fujimoto²,

Okubo³

et al. 2013

Journal of Magnetics

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We have developed a high-field and high-frequency ESR system using a commercially available magnetometer equipped with the superconducting quantum interference device (SQUID). This is magnetization detection type ESR and ESR is observed as a change of the magnetization at the resonance condition under irradiation of the electromagnetic wave. The frequency range is from 70 to 315 GHz and the maximum magnetic field is 5 T. The sensitivity is estimated to be 10 13 spins/G. The advantage of this system is that the high-field ESR measurements can be made very easily and quantitatively. Moreover, this high-field ESR can be applied to the measurements under pressure by using a widely used piston-cylinder pressure cell.

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“…ESR using a high magnetic field and high frequency has been recognized as a more powerful means to study spin systems recently because of high resolution of the g-value, observation of a broad absorption line, observation of ESR with a large zero-field gap, and so on [15][16][17][18][19][20][21]. However, most of the existing high-pressure ESR systems are limited to the low frequency range such as X-band.…”

Section: Introductionmentioning

confidence: 99%

Development of high-pressure and high-field ESR system using SQUID magnetometer

Sakurai

Fujimoto

Goto

et al. 2012

Journal of Magnetic Resonance

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How and why the characterization of magnetic materials can give directions in the methodological development in high field–high frequency EPR

Cited by 15 publications

References 32 publications

Signatures of low-energy fractionalized excitations in α−RuCl3 from field-dependent microwave absorption

Signatures of low-energy fractionalized excitations in α−RuCl3 from field-dependent microwave absorption

Development of High-Field ESR System Using SQUID Magnetometer and its Application to Measurement under High Pressure

Development of high-pressure and high-field ESR system using SQUID magnetometer

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