Competition of superconductivity with the structural transition inMo3Sb7
| Autor: | Tatsunori Okada, G. Z. Ye, Jiaqiang Yan, Q. Zhou, T. Yamauchi, Kazuyuki Matsubayashi, J. P. Sun, David S. Parker, Jinguang Cheng, Brian C. Sales, Yoshiya Uwatoko |
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| Rok vydání: | 2016 |
| Předmět: |
Superconductivity
Physics Condensed matter physics 02 engineering and technology Pressure dependence 021001 nanoscience & nanotechnology 01 natural sciences External pressure Pressure range Condensed Matter::Superconductivity 0103 physical sciences Structural transition 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 94 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.94.224508 |
| Popis: | Prior to the superconducting transition at ${T}_{\mathrm{c}}\ensuremath{\approx}2.3\phantom{\rule{4pt}{0ex}}\mathrm{K}, \mathrm{M}{\mathrm{o}}_{3}\mathrm{S}{\mathrm{b}}_{7}$ undergoes a symmetry-lowering, cubic-to-tetragonal structural transition at ${T}_{\mathrm{s}}=\phantom{\rule{0.16em}{0ex}}53\phantom{\rule{4pt}{0ex}}\mathrm{K}$. We have monitored the pressure dependence of these two transitions by measuring the resistivity of $\mathrm{M}{\mathrm{o}}_{3}\mathrm{S}{\mathrm{b}}_{7}$ single crystals under various hydrostatic pressures up to 15 GPa. The application of external pressure enhances ${T}_{\mathrm{c}}$ but suppresses ${T}_{\mathrm{s}}$ until ${P}_{\mathrm{c}}\ensuremath{\approx}10\phantom{\rule{4pt}{0ex}}\mathrm{GPa}$, above which a pressure-induced first-order structural transition takes place and is manifested by the phase coexistence in the pressure range $8\ensuremath{\le}P\ensuremath{\le}12\phantom{\rule{4pt}{0ex}}\mathrm{GPa}$. The cubic phase above 12 GPa is also found to be superconducting with a higher ${T}_{\mathrm{c}}\ensuremath{\approx}6\phantom{\rule{4pt}{0ex}}\mathrm{K}$ that decreases slightly with further increasing pressure. The variations with pressure of ${T}_{\mathrm{c}}$ and ${T}_{\mathrm{s}}$ satisfy the Bilbro-McMillan equation, i.e. ${{T}_{\mathrm{c}}}^{n}{{T}_{\mathrm{s}}}^{1\ensuremath{-}n}=$ constant, thus suggesting the competition of superconductivity with the structural transition that has been proposed to be accompanied with a spin-gap formation at ${T}_{\mathrm{s}}$. Our first-principles calculations suggest the importance of magnetism that competes with the superconductivity in $\mathrm{M}{\mathrm{o}}_{3}\mathrm{S}{\mathrm{b}}_{7}$. |
| Databáze: | OpenAIRE |
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