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Observation of suppressed viscosity in the normal state of 3He due to superfluid fluctuations

https://doi.org/10.1038/s41467-023-41422-3

Baten, Rakin N.; Tian, Yefan; Smith, Eric N.; Mueller, Erich J.; Parpia, Jeevak M. (September 2023, Nature Communications)

Abstract Evidence of fluctuations in transport have long been predicted in³He. They are expected to contribute only within 100μK ofT_cand play a vital role in the theoretical modeling of ordering; they encode details about the Fermi liquid parameters, pairing symmetry, and scattering phase shifts. It is expected that they will be of crucial importance for transport probes of the topologically nontrivial features of superfluid³He under strong confinement. Here we characterize the temperature and pressure dependence of the fluctuation signature, by monitoring the quality factor of a quartz tuning fork oscillator. We have observed a fluctuation-driven reduction in the viscosity of bulk³He, finding data collapse consistent with the predicted theoretical behavior.
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Conversion between $^3$He Melting Curve Scales below 100 mK

Tian, Yefan; Smith, Eric; Parpia, Jeevak (April 2022, Journal of low temperature physics)

We provide the conversion parameters to allow a $^3$$He melting curve thermometer to be used to calibrate secondary thermometers to the PLTS2000 temperature scale \cite{rusby2007realization}. Additional fits to the phase diagram of superfluid $$^3$He are also provided using the melting curve $P,T$ measurements and of the phase diagram of superfluid $^3$He as a bridge. Further the melting curve measurements of Osheroff and Yu are also used to extend the scale below 0.9 mK.
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Anomalous Inferred Viscosity and Normal Density Near the $$^3$$He $$T_{\mathrm{c}}$$ in a Torsion Pendulum

https://doi.org/10.1007/s10909-021-02619-2

Tian, Yefan; Smith, Eric; Reppy, John; Parpia, Jeevak (December 2021, Journal of Low Temperature Physics)

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Path-Dependent Supercooling of the ${}^{3}{He}$ Superfluid $A - B$ Transition

https://doi.org/10.1103/PhysRevLett.126.215301

Lotnyk, Dmytro; Eyal, Anna; Zhelev, Nikolay; Sebastian, Abhilash; Tian, Yefan; Chavez, Aldo; Smith, Eric; Saunders, John; Mueller, Erich; Parpia, Jeevak (May 2021, Physical Review Letters)
null (Ed.)
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Accelerated design of Fe-based soft magnetic materials using machine learning and stochastic optimization

https://doi.org/10.1016/j.actamat.2020.05.006

Wang, Yuhao; Tian, Yefan; Kirk, Tanner; Laris, Omar; Ross, Joseph H.; Noebe, Ronald D.; Keylin, Vladimir; Arróyave, Raymundo (August 2020, Acta Materialia)

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