Low-Temperature Phase Transition in Bi_2Sr_2Ca(Ni_xCu_{1-x})_20_8: Evidence for Unconventional Superconductivity

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dc.creatorMovshovich, R.
dc.creatorHubbard, M. A.
dc.creatorSalamon, M. B.
dc.creatorBalatsky, A. V.
dc.creatorYoshizaki, R.
dc.creatorSarrao, J. L.
dc.date1997-09-04
dc.date.accessioned2026-07-07T09:12:08Z
dc.date.available2026-07-07T09:12:08Z
dc.descriptionWe report the discovery of a low-temperature phase transition in Bi_2Sr_2Ca(Ni_xCu_{1-x})_20_8 high temperature superconductor. This transition manifests itself as a sharp reduction of the thermal conductivity of the samples at a temperature of T_c* \approx 200 mK. The temperature dependence of the thermal conductivity changes dramatically from T^αwith αbetween 1.6 and 1.75 above the transition to T-linear behavior below the transition. Application of a small magnetic field suppresses the low-temperature phase. We interpret this behavior as a phase transition into a second bulk low-temperature superconducting state in which the time-reversal symmetry is likely to be broken. This discovery constitutes direct evidence for unconventional superconductivity in high temperature superconductors.
dc.descriptionuuencoded latex file with 2 ps figure files
dc.identifierhttps://arxiv.org/abs/cond-mat/9709061
dc.identifierhttp://arxiv.org/abs/cond-mat/9709061
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/151917
dc.subjectSuperconductivity
dc.titleLow-Temperature Phase Transition in Bi_2Sr_2Ca(Ni_xCu_{1-x})_20_8: Evidence for Unconventional Superconductivity
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