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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Phase-resolved Higgs response in superconducting cuprates.

Hao Chu1,2,3, Min-Jae Kim1,2, Kota Katsumi4

  • 1Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany.

Nature Communications
|April 15, 2020
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Summary
This summary is machine-generated.

We studied the Higgs mode in superconductors using terahertz third harmonic generation. Our findings reveal interactions between the Higgs mode and other excitations, suggesting a nonzero pairing amplitude above the critical temperature.

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Area of Science:

  • High-energy physics
  • Condensed matter physics
  • Superconductivity

Background:

  • The Higgs field imparts mass to elementary particles by coupling to gauge bosons and fermions.
  • In superconductors, Cooper pairs exhibit properties analogous to the Higgs field.
  • Dissipation channels for the Higgs amplitude mode in superconductors can provide insights into microscopic pairing mechanisms.

Purpose of the Study:

  • To investigate the Higgs (amplitude) mode in cuprate thin films.
  • To explore the coupling of the Higgs mode to other collective modes.
  • To determine if a nonzero pairing amplitude exists above the critical temperature (Tc).

Main Methods:

  • Utilized phase-resolved terahertz third harmonic generation (THG).
  • Analyzed the Higgs (amplitude) mode in several cuprate thin films.
  • Measured THG signals above Tc.

Main Results:

  • Observed a heavily damped Higgs mode.
  • Detected a universal phase jump in the driven Higgs oscillation.
  • Measured a non-vanishing THG signal above Tc.

Conclusions:

  • The Higgs mode in cuprates couples to other collective modes.
  • The results suggest a potential nonzero pairing amplitude above Tc.
  • This research offers new avenues for understanding pairing mechanisms in superconductors.