Simultaneous measurement of torsional oscillations and NMR of very diluteH3ein solidH4e
| Autor: | Kei Kosaka, Ryo Toda, Patryk Gumann, W. Onoe, Masatomo Kanemoto, Yutaka Sasaki |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Physical Review B. 81 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.81.214515 |
| Popis: | We have investigated the NMR properties of dilute $^{3}\text{H}\text{e}$ impurities in solid $^{4}\text{H}\text{e}$ contained in a torsional oscillator (TO) by the simultaneous measurement of the NMR and the torsional oscillator response of the so-called supersolid $^{4}\text{H}\text{e}$. From measurements on samples with one hundred to a few hundred parts per million (ppm) of $^{3}\text{H}\text{e}$, we have found three different states of $^{3}\text{H}\text{e}$. The first is the homogeneously distributed isolated $^{3}\text{H}\text{e}$ atom in a solid matrix of $^{4}\text{H}\text{e}$. The second is the $^{3}\text{H}\text{e}$ cluster in a homogeneous $^{4}\text{H}\text{e}$ matrix, which appears below the phase-separation temperature of a solid mixture. The third is the $^{3}\text{H}\text{e}$ cluster in some nonuniform part of a $^{4}\text{H}\text{e}$ crystal. We find that $^{3}\text{H}\text{e}$ atoms contained in the third component remain in a nearby location even above the phase-separation temperature. Based on the fact that even a ppm of $^{3}\text{H}\text{e}$ affects the supersolid response in a TO below and above the phase-separation temperature, we propose that the nonuniform part of a crystal that holds the third type of $^{3}\text{H}\text{e}$ and thus has a higher local concentration of $^{3}\text{H}\text{e}$ plays an important role in the supersolid phenomenon in a TO. |
| Databáze: | OpenAIRE |
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