Low-temperature vortex liquid in La 2-x Sr x CuO 4

Lu Li, J. G. Checkelsky, Seiki Komiya, Yoichi Ando, N. P. Ong

Research output: Contribution to journalArticle

57 Scopus citations


In copper oxide superconductors, the lightly doped (small dopant concentration, x) region is of major interest because superconductivity, antiferromagnetism and the pseudogap state come together near a critical doping value, x c . But the way in which superconductivity is destroyed as x is decreased at very low temperatures, T, is not clear. Does the pair condensate vanish abruptly at a critical value, x c ? Or is phase coherence of the condensate destroyed by spontaneous vortices-as is the case at elevated T (refs-8, 9, 10)? So far, magnetization data at low T are very sparse in this region of the phase diagram. Here, we report torque magnetometry measurements on La 2x Sr x CuO 4 , which show that, in zero magnetic field, quantum phase fluctuations destroy superconductivity at x c ≈ 0.055. The phase-disordered condensate survives to x=0.03. In finite field H, the vortex solid-to-liquid transition occurs at H lower than the depairing field, H c2 . The resulting phase diagram reveals the large fraction of the x-H plane occupied by the quantum vortex liquid.

Original languageEnglish (US)
Pages (from-to)311-314
Number of pages4
JournalNature Physics
Issue number5
StatePublished - May 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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