000204228 001__ 204228
000204228 005__ 20190527113955.0
000204228 0247_ $$2doi$$a10.1103/PhysRevB.87.144513
000204228 022__ $$a1098-0121
000204228 02470 $$a000317822300015$$2ISI
000204228 037__ $$aARTICLE
000204228 245__ $$aGlassy low-energy spin fluctuations and anisotropy gap in La1.88Sr0.12CuO4
000204228 269__ $$a2013
000204228 260__ $$bAmerican Physical Society$$c2013
000204228 336__ $$aJournal Articles
000204228 520__ $$aWe present high-resolution triple-axis neutron scattering studies of the high-temperature superconductor La1.88Sr0.12CuO4 (Tc=27 K). The temperature dependence of the low-energy incommensurate magnetic fluctuations reveals distinctly glassy features. The glassiness is confirmed by the difference between the ordering temperature TN≃Tc inferred from elastic neutron scattering and the freezing temperature Tf≃11 K obtained from muon spin rotation studies. The magnetic field independence of the observed excitation spectrum as well as the observation of a partial suppression of magnetic spectral weight below 0.75 meV for temperatures smaller than Tf, indicate that the stripe frozen state is capable of supporting a spin anisotropy gap, of a magnitude similar to that observed in the spin and charge stripe-ordered ground state of La1.875Ba0.125CuO4. The difference between TN and Tf implies that the significant enhancement in a magnetic field of nominally elastic incommensurate scattering is caused by strictly inelastic scattering—at least in the temperature range between Tf and Tc—which is not resolved in the present experiment. Combining the results obtained from our study of La1.88Sr0.12CuO4 with a critical reappraisal of published neutron scattering work on samples with chemical composition close to p=0.12, where local probes indicate a sharp maximum in Tf(p), we arrive at the view that the low-energy fluctuations are strongly dependent on composition in this regime, with anisotropy gaps dominating only sufficiently close to p=0.12 and superconducting spin gaps dominating elsewhere.
000204228 6531_ $$aMPBH
000204228 700__ $$aRomer, A. T.
000204228 700__ $$0246465$$g209411$$aChang, J.
000204228 700__ $$aChristensen, N. B.
000204228 700__ $$aAndersen, B. M.
000204228 700__ $$aLefmann, K.
000204228 700__ $$aMaehler, L.
000204228 700__ $$aGavilano, J.
000204228 700__ $$aGilardi, R.
000204228 700__ $$aNiedermayer, Ch.
000204228 700__ $$0243430$$g176429$$aRønnow, Henrik M.
000204228 700__ $$aSchneidewind, A.
000204228 700__ $$aLink, P.
000204228 700__ $$aOda, M.
000204228 700__ $$aIdo, M.
000204228 700__ $$aMomono, N.
000204228 700__ $$aMesot, J.
000204228 773__ $$j87$$tPhysical Review B$$k14
000204228 8564_ $$uhttps://infoscience.epfl.ch/record/204228/files/Romer%20et%20al.%20-%202013%20-%20Glassy%20low-energy%20spin%20fluctuations%20and%20anisotropy.pdf$$zn/a$$s827119$$yn/a
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000204228 937__ $$aEPFL-ARTICLE-204228
000204228 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000204228 980__ $$aARTICLE