Muon diffusion and electronic magnetism in Y$_2$Ti$_2$O$_7$

A. Yaouanc; B. Barbara; E. Pomjakushina; J.A. Rodriguez; P. Qu\'emerais; Z. Salman

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Muon diffusion and electronic magnetism in Y$_2$Ti$_2$O$_7$

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arxiv 1303.3401 v1 pith:TUUMKFCY submitted 2013-03-14 cond-mat.str-el

J.A. Rodriguez , A. Yaouanc , B. Barbara , E. Pomjakushina , P. Quémerais , Z. Salman This is my paper

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abstract

We report a $\mu$SR study in a Y$_2$Ti$_2$O$_7$ single crystal. We observe slow local field fluctuations at low temperature which become faster as the temperature is increased. Our analysis suggests that muon diffusion is present in this system and becomes small below 40 K and therefore incoherent. A surprisingly strong electronic magnetic signal is observed with features typical for muons thermally diffusing towards magnetic traps below $\approx 100$ K and released from them above this temperature. We attribute the traps to Ti$^{3+}$ defects in the diluted limit. Our observations are highly relevant to the persistent spin dynamics debate on $R_2$Ti$_2$O$_7$ pyrochlores and their crystal quality.

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