Terahertz-range free-electron laser electron spin resonance spectroscopy: Techniques and applications in high magnetic fields

Zvyagin, S. A.; Ozerov, Mykhaylo; Čižmár, E.; Kamenskyi, D.; Жерлицын, С.; Herrmannsdörfer, T.; Wosnitza, J.; Wünsch, R.; Seidel, W.

doi:10.1063/1.3155509

Cited by 57 publications

(41 citation statements)

References 33 publications

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“…[42][43][44][45] However, these spectrometers are highly specialized and operate in one dedicated high-field environment, 41 and a very recent commercial system provides a high ESR sensitivity but narrow (0.2 T) field sweep range. 46 A compact and mobile quasi-optical ESR spectrometer is desirable, which combines sub-THz frequency acceptance of very broad range and operates with different radiation sources and laboratory cryostats containing samples conditioned according to specific research requirements.…”

Section: Improving Electron Spin Resonance (Esr)mentioning

confidence: 99%

Field and frequency modulated sub-THz electron spin resonance spectrometer

et al. 2016

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260-GHz radiation is used for a quasi-optical electron spin resonance (ESR) spectrometer which features both field and frequency modulation. Free space propagation is used to implement Martin-Puplett interferometry with quasi-optical isolation, mirror beam focusing, and electronic polarization control. Computer-aided design and polarization pathway simulation lead to the design of a compact interferometer, featuring lateral dimensions less than a foot and high mechanical stability, with all components rated for power levels of several Watts suitable for gyrotron radiation. Benchmark results were obtained with ESR standards (BDPA, DPPH) using field modulation. Original high-field ESR of 4f electrons in Sm3+-doped Ceria was detected using frequency modulation. Distinct combinations of field and modulation frequency reach a signal-to-noise ratio of 35 dB in spectra of BDPA, corresponding to a detection limit of about 1014 spins.

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Section: Improving Electron Spin Resonance (Esr)mentioning

confidence: 99%

Field and frequency modulated sub-THz electron spin resonance spectrometer

et al. 2016

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“…The exchange constant J = 36 ± 0.5 K was extracted from the single-crystal susceptibility [15] and confirmed by magnetization measurements [23]. High-field ESR experiments of Cu-PM were performed at the Dresden High Magnetic Field Laboratory (Hochfeld-Magnetlabor Dresden, HLD) using a pulsedfield ESR spectrometer [24] equipped with VDI sources of millimeter-wave radiation (product of Virginia Diodes Inc.) and with a transmission-type probe in the Faraday configuration. A 8.5 MJ/70 T magnet was employed to generate pulsed magnetic fields with a pulse-field rise time of 35 ms and full-pulse durations of about 150 ms.…”

mentioning

confidence: 99%

Field-induced gap in a quantum spin-12chain in a strong magnetic field

et al. 2011

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Magnetic excitations in copper pyrimidine dinitrate, a spin-1/2 antiferromagnetic chain with alternating g-tensor and Dzyaloshinskii-Moriya interactions that exhibits a field-induced spin gap, are probed by means of pulsed-field electron spin resonance spectroscopy. In particular, we report on a minimum of the gap in the vicinity of the saturation field Hsat = 48.5 T associated with a transition from the sine-Gordon region (with soliton-breather elementary excitations) to a spin-polarized state (with magnon excitations). This interpretation is fully confirmed by the quantitative agreement over the entire field range of the experimental data with the DMRG calculations for spin-1/2 Heisenberg chain with a staggered transverse field.PACS numbers: 75.40. Gb, 75.10.Jm Introduction.-Due to recent progress in theory and the growing number of physical realizations, lowdimensional quantum magnets continue to receive a considerable amount of attention. They serve as model systems for investigating numerous fascinating phenomena in materials with cooperative ground states, in particular, induced by high magnetic fields. The way a magnetic field changes the ground-state properties and, correspondingly, the low-energy excitation spectrum of lowdimensional magnets is one of the fundamental aspects in quantum magnetism. For example, the zero-field ground state of an isotropic S = 1/2 Heisenberg antiferromagnetic (AF) chain with uniform nearest-neighbor exchange coupling is a spin singlet, and its spin dynamics is determined by a gapless two-particle continuum of fractional S = 1/2 excitations, called spinons. Application of an external magnetic field H leads to a pronounced rearrangement of the excitation spectrum, making the soft modes incommensurate [1, 2] but leaving the spinon continuum gapless. However, in a fully spin-polarized phase, H > H sat , the excitation spectrum is gapped and dominated by ordinary spin waves (magnons). The low-energy excitation spectrum of such an ideal isotropic Heisenberg S = 1/2 chain can be described in terms of an effective free massless boson theory [3][4][5].The presence of additional interactions such as Dzyaloshinskii-Moriya (DM) interaction [7] can significantly alter the physical properties of such spin systems (see for instance Ref.[6]), and, in particular, their highfield behavior. A Heisenberg spin-1/2 chain with exchange interaction J and DM interaction (or alternating g-tensor) in a field H can be mapped to a simple Heisenberg chain with a staggered transverse field h ∝ H [8-10], described by the effective spin Hamiltonian

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“…A new-type of THz-FEL is the FELBE radiation source in DresdenRossendorf, Germany, which is a superconducting linear accelerator operating with a much higher pulse repetition rate of 13 MHz. 197) Using the THz-FEL from FELBE, there have been several actual applications, such as high-field ESR combined with a pulse magnet, 198) the ultrafast spectroscopy of semiconductors, microscopy using a scattering scanning near-field optical microscope (s-SNOM), 199) and the THz spectroscopy of protein dynamics and complex materials excited by THz-FEL (THz pump-THz probe). 200) On the other hand, CSR has a longer wavelength than the length of the longitudinal fine structure of an electron bunch in an accelerator.…”

Section: Ir Magneto-optical Imaging On Euomentioning

confidence: 99%

Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions

Kimura

Okamura

2013

J. Phys. Soc. Jpn.

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Owing to its high brilliance, infrared and terahertz synchrotron radiation (IR/THz-SR) has emerged as a powerful tool for spectroscopy under extreme (i.e., technically more difficult) experimental conditions such as high pressure, high magnetic field, high spatial resolution, and a combination of these. The methodologies for pressure-and magneticfield-dependent spectroscopy and microscopy using IR/THz-SR have advanced rapidly worldwide. By applying them to strongly correlated electron systems (SCESs), many experimental studies have been performed on their electronic structures and phonon/molecular vibration modes under extreme conditions. Here, we review the recent progress of methodologies of IR/THz-SR spectroscopy and microscopy, and the experimental results on SCESs and other systems obtained under extreme conditions.

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Terahertz-range free-electron laser electron spin resonance spectroscopy: Techniques and applications in high magnetic fields

Cited by 57 publications

References 33 publications

Field and frequency modulated sub-THz electron spin resonance spectrometer

Field and frequency modulated sub-THz electron spin resonance spectrometer

Field-induced gap in a quantum spin-12chain in a strong magnetic field

Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions

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