Abstract
The most fascinating phenomenon of “vortex matter”, which is a highly correlated system composed of the magnetic flux lines in superconductors, is the first-order melting transition from flux line lattice to liquid. In low-\(T_{c}\) superconductors, the transition is extremely difficult to observe, because it occurs in the immediate vicinity of the mean-field upper critical field \(H_{c2}\). In contrast, the melting transition is established in high-\(T_{c}\) cuprates at several tens of Kelvin, owing to large thermal fluctuations. In this chapter, through the electro- and thermal-transport transport study, we show that in ultraclean heavy-fermion superconductor \(\mathrm{{URu}}_2\mathrm{{Si}}_2\) (\(T_c =1.4\) K) a distinct melting transition with outstanding characters occurs well below \(H_{c2}\). In \(\mathrm{{URu}}_2\mathrm{{Si}}_2\), very low carrier number with heavy mass results in exceptionally large fluctuations even below 1 K. The uniqueness is further highlighted by a thermal conductivity anomaly below the melting transition, indicating enhancement of the quasiparticle mean free path possibly due to the formation of a quasiparticle Bloch state.
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Okazaki, R. (2013). Vortex Lattice Melting Transition. In: Hidden Order and Exotic Superconductivity in the Heavy-Fermion Compound URu2Si2. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54592-7_5
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DOI: https://doi.org/10.1007/978-4-431-54592-7_5
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