Phonon softening and anomalous mode near the xc=0.5 quantum critical point in Ca2xSrxRuO4

R. G. Moore; M. D. Lumsden; M. B. StoneJiandi ZhangY. ChenJ. W. LynnR. JinD. MandrusE. W. Plummer

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Phonon softening and anomalous mode near the xc=0.5 quantum critical point in Ca2xSrxRuO4

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Inelastic neutron scattering is used to measure the temperature-dependent phonon dispersion in Ca_(2x)Sr_xRuO_4 x=0.4, 0.6. The in-plane 4 octahedral tilt mode softens significantly at the zone boundary of the high-temperature tetragonal (HTT) I41 /acd structure as the temperature approaches the transition to a low-temperature orthorhombic (LTO) Pbca phase. This behavior is similar to that in La2CuO4, but an inelastic feature that is not found in the cuprate is present. An anomalous phonon mode is observed at energy transfers greater than the 4, albeit with similar dispersion. This anomalous phonon mode never softens below 5 meV, even for temperatures below the HTT-LTO transition. This mode is attributed to the presence of intrinsic structural disorder within the I41 /acd tetragonal structure of the doped ruthenate.

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《Physical review, B. Condensed matter and materials physics》 |2009年第17期|172301:1-172301:4|共4页
作者
R. G. Moore; M. D. Lumsden; M. B. StoneJiandi ZhangY. ChenJ. W. LynnR. JinD. MandrusE. W. Plummer;
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作者单位

Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA;

Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 32831, USA;

Department of Physics, Florida International University, Miami, Florida 33199, USANIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USAMaterials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

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正文语种英语
中图分类物理学;
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transition; temperatures; low-temperature orthorhombic LTO;

Phonon softening and anomalous mode near the xc=0.5 quantum critical point in Ca2xSrxRuO4

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