Experimental Evidence for a Glass forming "Stripe Liquid" in the Magnetic Ground State of La1.65Eu0.2Sr0.15CuO4

Abstract

We report measurements of the longitudinal (${}^{139}{T}_1^{-1}$) and transverse (${}^{139}{T}_2^{-1}$) decay rates of the magnetization of ${}^{139}$La nuclei performed in a high quality single crystal of La${}_{1.65}$Eu${}_{0.2}$Sr${}_{0.15}$CuO${}_4$. We observe a dramatic slowing of the Cu 3d spins manifested as a sharp increase of both ${}^{139}{T}_1^{-1}$ and ${}^{139}{T}_2^{-1}$ below 30 K. We find that in this temperature range the fluctuations involve a unique time scale $\tau$ which diverges as $(T-T_{\mathrm{A}}{)}^{-1.9}$ with $T_{\mathrm{A}}\approx 5$ K. This behavior is distinct from the continuous freezing observed in underdoped La${}_{1-x}$Sr${}_x$CuO${}_4$ which involves a distribution of energy barriers. By contrast, in La${}_{1.65}$Eu${}_{0.2}$Sr${}_{0.15}$CuO${}_4$, the freezing below 30K is intrinsic to its magnetic ground state and the observed power law supports the existence of a glass forming "charge stripe liquid".

5 pages, 3 Figures. Revised version, resubmitted

References in corpus (3)

• Self generated randomness, defect wandering and viscous flow in stripe glasses
• Langevin dynamics of the Coulomb frustrated ferromagnet: a mode-coupling analysis
• Cluster Spin Glass Distribution Functions in La${}_{2-x}$Sr${}_x$CuO${}_4$

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