Broadband Noise Across the Mode-Locking Freezing in Driven Vortex Matter

Okuma, S.; Inoue, Jun‐ichi; Kokubo, N.

doi:10.1142/s0217979207044597

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…Figure 2c is a phase diagram of superconductivity in the present MoGe|YIG sample, with vortex melting field B m and upper critical field B c2 defined as in ref. 25 . Here, the magnetic field is almost parallel to the sample surface.…”

Section: Resultsmentioning

confidence: 99%

Vortex rectenna powered by environmental fluctuations

et al. 2018

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A rectenna, standing for a rectifying antenna, is an apparatus which generates d.c. electricity from electric fluctuations. It is expected to realize wireless power transmission as well as energy harvesting from environmental radio waves. To realize such rectification, devices that are made up of internal atomic asymmetry such as an asymmetric junction have been necessary so far. Here we report a material that spontaneously generates electricity by rectifying environmental fluctuations without using atomic asymmetry. The sample is a common superconductor without lowered crystalline symmetry, but, just by putting it in an asymmetric magnetic environment, it turns into a rectifier and starts generating electricity. Superconducting vortex strings only annihilate and nucleate at surfaces, and this allows the bulk electrons to feel surface fluctuations in an asymmetric environment: a vortex rectenna. The rectification and generation can be switched on and off with only a slight change in temperature or external magnetic fields.

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Section: Resultsmentioning

confidence: 99%

Vortex rectenna powered by environmental fluctuations

et al. 2018

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Observation of nonlinear thermoelectric effect in MoGe/Y3Fe5O12

Arisawa,

Fujimoto,

Kikkawa

et al. 2024

Nat Commun

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Thermoelectric effects refer to the voltage generation from temperature gradients in condensed matter. Although various power generators are made from them, all the known effects, such as Seebeck effect, require macroscopic temperature gradients; since the sign of the generated voltage is reversed by reversing the temperature gradient, the net voltage disappears when the temperature distribution fluctuates temporarily or spatially with a macroscopic temperature gradient of zero. It is impossible to utilize such temperature fluctuations in the conventional thermoelectric effects, a situation which limits their application. Here we report the observation of a second-order nonlinear thermoelectric effect; we develop a method to measure nonlinear thermoelectricity and observe that a superconducting MoGe film on Y3Fe5O12 generates a voltage proportional to the square of the applied temperature gradient. The nonlinear thermoelectric generation demonstrated here provides a way for making power generators that produce electric power from temperature fluctuations.

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