Experimental observation of a first-order phase transition below the superconducting transition temperature in the multilayer cuprate superconductor HgBa${}_2$Ca${}_4$Cu${}_5$O${}_y$

Abstract

A first-order phase transition is found in the multilayer cuprate superconductor, HgBa${}_2$Ca${}_4$Cu${}_5$O${}_y$ (Hg-1245), with a superconducting transition temperature of 108 K, under zero magnetic field. We observed a hysteretic specific heat jump around 41 K. We conclude that the Bardeen-Cooper-Schrieffer pairs have a residual entropy due to fluctuations in the phase difference between the five CuO${}_2$ planes in a unit cell of Hg-1245, and that this fluctuation freezes below the first-order phase transition temperature.

30 pages, 5 figures, one revision before the published one

References in corpus (4)

• Uniform Mixing of High-Tc Superconductivity and Antiferromagnetism on a Single CuO2 Plane in Hg-based Five-layered Cuprate
• Coexistence of Superconductivity and Antiferromagnetism in Multilayered High-$T_c$ Superconductor HgBa${}_2$Ca${}_4$Cu${}_5$O${}_y$: A Cu-NMR Study
• Twofold spontaneous symmetry breaking in a heavy fermion superconductor UPt${}_3$
• Proximity-induced time-reversal symmetry breaking at Josephson junctions between unconventional superconductors

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