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Near-Surface Structural Phase Transition of SrTiO$_3$ Studied with Zero-Field $\beta$-Detected Nuclear Spin Relaxation and Resonance

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arxiv cond-mat/0511526 v2 pith:DAG34X4I submitted 2005-11-22 cond-mat.stat-mech cond-mat.mtrl-sci

Z. Salman , R.F. Kiefl , K.H. Chow , M.D. Hossain , T.A. Keeler , S.R. Kreitzman , C.D.P. Levy , R.I. Miller
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T.J. Parolin M.R. Pearson H. Saadaoui J.D. Schultz M. Smadella D. Wang W.A. MacFarlane
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classification cond-mat.stat-mechcond-mat.mtrl-sci
keywords betadetectednearnuclearphaserelaxationresonancespin
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abstract

We demonstrate that zero-field $\beta$-detected nuclear quadrupole resonance and spin relaxation of low energy $^8$Li can be used as a sensitive local probe of structural phase transitions near a surface. We find that the transition near the surface of a SrTiO$_3$ single crystal occurs at $T_c \sim 150$ K, i.e., 45 K higher than $T^{bulk}_c$, and that the tetragonal domains formed below $T_c$ are randomly oriented.

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