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Flux line lattice melting and the formation of a coherent quasiparticle bloch state in the ultraclean URu$$_2$$Si$$_2$$ superconductor

Okazaki, Ryuji*; Kasahara, Yuichi*; Shishido, Hiroaki*; Konczykowski, M.*; Behnia, K.*; Haga, Yoshinori; Matsuda, Tatsuma; Onuki, Yoshichika; Shibauchi, Takasada*; Matsuda, Yuji*

We find that in ultraclean heavy-fermion superconductor URu$$_2$$Si$$_2$$ ($$T_c0 = 1.45$$ K) a distinck flux line lattice melting transition with outstanding characters occurs well below the mean-field upper critical fields. We show that a very small number of carriers with heavy mass in this system results in exceptionally large thermal fluctuations even at subkelvin temperatures, which are witnessed by a sizable region of the flux line liquid phase. The uniqueness is further highlighted by an enhancement of the quasiparticle mean free path below the melting transition, implying a possible formation of a quasiparticle Bloch state in the periodic flux line lattice.

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Category:Physics, Multidisciplinary

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