Radio frequency self-resonant coil for contactless AC-conductivity in 100 T class ultra-strong pulse magnetic fields

Nakamura, Daisuke; Altarawneh, M. M.; Takeyama, S.

doi:10.1088/1361-6501/aa9a0b

Cited by 12 publications

(6 citation statements)

References 40 publications

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“…The in-plane electrical conductivity of LSCO sample was measured by the contactless self-resonant coil method 38,68 . A home-made planar probe coil worked by itself as an LCR resonant circuit (self-resonant coil, hereafter called as SRC).…”

Section: Resultsmentioning

confidence: 99%

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Pauli-limit upper critical field of high-temperature superconductor La1.84Sr0.16CuO4

Nakamura

Adachi

Omori

et al. 2019

Sci Rep

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The upper critical field of a cuprate high-temperature superconductor, La1.84Sr0.16CuO4, was investigated by high-frequency self-resonant contactless electrical conductivity measurements in magnetic fields up to 102 T. An irreversible transition was observed at 85 T (T = 4.2 K), defined as the upper critical field. The temperature-dependent upper critical field was argued on the basis of the Werthamer-Helfand-Hohenberg theory. The Pauli-limiting pair-breaking process with a small contribution of the spin-orbit coupling explained the first-order phase transition exhibiting a hysteresis observed at low temperatures.

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Section: Resultsmentioning

confidence: 99%

“…A RF was converted to the value of σ by using a formula based on the electromagnetic analysis of the SRC described in ref. 38 (also see Supplementary Fig. S3).…”

Section: Introductionmentioning

confidence: 98%

Pauli-limit upper critical field of high-temperature superconductor La1.84Sr0.16CuO4

Nakamura

Adachi

Omori

et al. 2019

Sci Rep

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“…The RF method of conductivity measurement has been successfully applied in ultrahigh magnetic field for a long time [28,20,21,29,30,22,31]. The absence of contacts with a sample and using a narrow frequency band makes it possible to suppress electromagnetic interference that are induced by ultrahigh magnetic field.…”

Section: Rf Conductivity Measurementmentioning

confidence: 99%

On semiconductor--metal transition in FeSi induced by ultrahigh magnetic field

Kudasov¹,

Maslov²

2023

Preprint

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At low temperatures, iron monosilicide is a strongly correlated narrow-gap semiconductor. A first order transition to metal state induced by magnetic field was observed for the first time at 355 T in Ref. [Yu. B. Kudasov et al., JETP Lett. 68 (1998) 350]. However, recently a smooth transition from 230 T to 270 T was found under similar conditions in Ref. [D. Nakamura et al., Phys. Rev. Lett. 127 (2021) 156601]. This discrepancy goes far beyond experimental errors and deserves a careful study. A methodological analysis of inductive and RF techniques of conductivity measurements shows that the difference of these critical magnetic field estimations stems from a divergence in dynamic ranges of the techniques. In fact, the above mentioned methods supplement each other. The semiconductor-metal transition under magnetic field in FeSi is a complex phenomenon which occurs at the wide range of magnetic fields.

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“…Due to the nature of the megagauss pulse magnets such as electromagnetic flux compression (EMFC) technique and single turn coil (STC) method [4], measurement techniques are required to be robust against electric noises and to respond in high-speed at >10 MHz under the µs-pulsed megagauss field pulse. Numerous efforts have been paid for the development of measurement techniques in megagauss fields such as conductivity measurements using radio frequency (RF) transmission [5], [6] and RF resonance [7] techniques, magnetization measurements using faraday rotation [8], [9] and induction methods [10]- [13], and so forth. Number of novel findings are made recently in megagauss regions in condensed matter physics.…”

Section: Introductionmentioning

confidence: 99%

Magnetostriction studies up to megagauss fields using fiber Bragg grating technique

Ikeda

Matsuda

Nakamura

et al. 2018

2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)

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We here report magnetostriction measurements under pulsed megagauss fields using a high-speed 100 MHz strain monitoring system devised using fiber Bragg grating (FBG) technique with optical filter method. The optical filter method is a detection scheme of the strain of FBG, where the changing Bragg wavelength of the FBG reflection is converted to the intensity of reflected light to enable the 100 MHz measurement. In order to show the usefulness and reliability of the method, we report the measurements for solid oxygen, spin-controlled crystal, and volborthite, a deformed Kagomé quantum spin lattice, using static magnetic fields up to 7 T and non-destructive millisecond pulse magnets up to 50 T. Then, we show the application of the method for the magnetostriction measurements of CaV4O9, a two-dimensional antiferromagnet with spin-halves, and LaCoO3, an anomalous spin-crossover oxide, in the megagauss fields.

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Radio frequency self-resonant coil for contactless AC-conductivity in 100 T class ultra-strong pulse magnetic fields

Cited by 12 publications

References 40 publications

Pauli-limit upper critical field of high-temperature superconductor La1.84Sr0.16CuO4

Pauli-limit upper critical field of high-temperature superconductor La1.84Sr0.16CuO4

On semiconductor--metal transition in FeSi induced by ultrahigh magnetic field

Magnetostriction studies up to megagauss fields using fiber Bragg grating technique

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