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000841162 1001_ $$0P:(DE-Juel1)166566$$aPecanha Antonio, Viviane$$b0
000841162 245__ $$aMagnetic excitations in the ground state of Yb$_{2}$ Ti$_{2}$ O$_{7}$
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000841162 520__ $$aWe report an extensive study on the zero field ground state of a powder sample of the pyrochlore Yb$_{2}$Ti$_{2}$O$_{7}$. A sharp heat capacity anomaly that labels a low temperature phase transition in this material is observed at 280 mK. Neutron diffraction shows that a quasicollinear ferromagnetic order develops below Tc with a magnetic moment of 0.87(2)μB. High resolution inelastic neutron scattering measurements show, below the phase transition temperature, sharp gapped low-lying magnetic excitations coexisting with a remnant quasielastic contribution likely associated with persistent spin fluctuations. Moreover, a broad inelastic continuum of excitations at ∼0.6 meV is observed from the lowest measured temperature up to at least 2.5 K. At 10 K, the continuum has vanished and a broad quasielastic conventional paramagnetic scattering takes place at the observed energy range. Finally, we show that the exchange parameters obtained within the framework of linear spin-wave theory do not accurately describe the observed zero field inelastic neutron scattering data.
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000841162 7001_ $$0P:(DE-Juel1)159565$$aFeng, Erxi$$b1
000841162 7001_ $$0P:(DE-Juel1)130991$$aSu, Yixi$$b2$$eCorresponding author
000841162 7001_ $$0P:(DE-HGF)0$$aPomjakushin, Vladimir$$b3
000841162 7001_ $$0P:(DE-HGF)0$$aDemmel, Franz$$b4
000841162 7001_ $$0P:(DE-HGF)0$$aChang, Lieh-Jeng$$b5
000841162 7001_ $$0P:(DE-Juel1)159189$$aAldus, Robert$$b6
000841162 7001_ $$0P:(DE-Juel1)131047$$aXiao, Yinguo$$b7
000841162 7001_ $$0P:(DE-HGF)0$$aLees, Martin R.$$b8
000841162 7001_ $$0P:(DE-Juel1)130572$$aBrückel, Thomas$$b9
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