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Defect motion in a quantum solid with spin: hcp 3He
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DOI：10.1103/PhysRevB.95.180103.png)
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Defect motion in solid helium has a unique quantum nature due to the large zero-point motion of helium atoms, which allows vacancies and isotopic impurities to tunnel and move ballistically. Recent shear modulus experiments showed that dislocations are also extraordinarily mobile in solid He-4. The lighter isotope, He-3, has even larger zero-point motion and an extra degree of freedom-nuclear spin-which can affect defect motion. We have measured the shear modulus of hcp solid He-3 to probe the motion of dislocations and isotopic impurities. We observed a crossover between stiff and soft states, due to He-4 impurities which immobilize dislocations at low temperatures. In contrast to solid He-4, the impurities in hcp He-3 act as static pinning sites because of the disordered configuration of He-3 nuclear spins. In addition, we observed an unexpected dissipation that increased rapidly at low frequencies, indicating a strong interaction between nuclear spins and moving dislocations.
Keyword:
SHEAR MODULUS
BCC HE-3
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期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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引用论文
Thermally activated and quantum plasticity of solid 3He at temperatures below 0.5 K.png)
PHYSICAL REVIEW B
PHYSICAL REVIEW BIF3.7
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