A new kind of magnetic resonance observed in the organic molecular metal α-(BEDT-TTF)2KHg(SCN)4

Cyclotron resonance in the layered perovskite superconductor Sr2RuO4

“…The temperature is 0.6 K. The traces are offset for clarity [26]. and the wave in the cavity is reduced with angle by a factor (cos θ); hence the amplitude of transmission of the whole system (signal in and out) falls by a factor (cos 2 θ ) (reduction factor cos 2 (70 • ) = 0.12) [17,18]. The data are shown offset for clarity, with no background subtraction.…”

“…Cyclotron resonance in Sr 2 RuO 4 was observed using a millimetre-wave cavity perturbation technique [17]. Such measurements have been shown to probe the bulk conductivity properties of a number of anisotropic conductors [17][18][19][20]. In the current experiment, changes in the dissipation of the cavity (Q factor) are measured as a function of an external quasistatic magnetic field B with the millimetre-wave frequency f held constant [17].…”

“…On introducing a typical crystal, the quality factor of the cavity changes from ∼1500 to ∼1200 and the resonant frequency shifts by ∼130 MHz. The oscillatory electromagnetic field in the cavity induces currents in the sample with a magnitude proportional to the sample's conductivity [17,18,20,21]. The currents dissipate energy, affecting the quality factor of the cavity and thus the amplitude of the millimetre-wave transmitted through it.…”

Development and Applications of Magnetooptical Measurement System Equipped with a Rotational Resonant Cavity in the Millimeter-Wave Region

“…The rotational resonant cavity was developed previously and a Q factor of 1500 at 4.2 K was achieved by using the rectangular resonant cavity. 7,14) In the case of electron spin resonance (ESR), the minimum detectable number of spins is inversely proportional to the Q factor. 13) Therefore, the achievement of a high Q factor leads to high sensitivity.…”

“…These resonances are called Q1D or Q2D-periodic orbit resonances (PORs), and have attracted much attention because of their potential application to the precise determination of the important parameters describing the FS topology of the Q1D (Q2D) conductors, for example, Fermi velocity. [6][7][8][9][10][11] According to these reports, the resonance fields of these POR or CR show characteristic angular dependence against the magnetic field direction, and the FS topology can be determined from the angular dependence of the resonance fields. Therefore, we must measure the precise and detailed angular dependence of the absorption lines to examine the detailed FS topologies.…”