Low-temperature and high-pressure Raman and x-ray studies of pyrochlore Tb_2Ti_2O_7: Phonon anomalies and possible phase transition

Surajit Saha; D. V. S Muthu; Surjeet Singh; B. Dkhil; R. Suryanarayanan; G. Dhalenne; H. K. Poswal; S. Karmakar; Surinder M. Sharma; A. Revcolevschi; A. K. Sood

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Low-temperature and high-pressure Raman and x-ray studies of pyrochlore Tb_2Ti_2O_7: Phonon anomalies and possible phase transition

机译：烧绿石Tb_2Ti_2O_7的低温高压拉曼和x射线研究：声子异常和可能的相变

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We have earned out temperature- and pressure-dependent Raman and x-ray measurements on single crystals of Tb_2Ti_2O_7. We attribute the observed anomalous temperature dependence of phonons to phonon-phonon anharmonic interactions. The quasiharmonic and anharmonic contributions to the temperature-dependent changes in phonon frequencies are estimated quantitatively using mode Griineisen parameters derived from pressure-dependent Raman experiments and bulk modulus from high-pressure x-ray measurements. Further, our Raman and x-ray data suggest a subtle structural deformation of the pyrochlore lattice at ～9 GPa. We discuss possible implications of our results on the spin-liquid behavior of Tb_2Ti_1O_7.

机译：我们已经在Tb_2Ti_2O_7单晶上获得了与温度和压力有关的拉曼光谱和x射线测量结果。我们将声子对温度的异常依赖性归因于声子与声子的非谐相互作用。声子频率中温度相关变化的准谐波和非谐波贡献是使用模式Griineisen参数（来自压力依赖型拉曼实验）和体积模量（来自高压X射线测量）定量估算的。此外，我们的拉曼光谱和X射线数据表明，烧绿石晶格在〜9 GPa处有细微的结构变形。我们讨论了我们的结果可能对Tb_2Ti_1O_7的自旋液体行为的影响。

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来源
《Physical review》 |2009年第13期|213-221|共9页
作者
Surajit Saha; D. V. S Muthu; Surjeet Singh; B. Dkhil; R. Suryanarayanan; G. Dhalenne; H. K. Poswal; S. Karmakar; Surinder M. Sharma; A. Revcolevschi; A. K. Sood;
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Department of Physics, Indian Institute of Science, Bangalore 560012. India;

Department of Physics, Indian Institute of Science, Bangalore 560012. India;

Laboratoire de Physico-Chimie de l'Etat Solide, ICMMO, CNRS, UMR8648, Universite Paris-Sud. Bat 414, 91405 Orsay, France;

Laboratoire Structures, Proprietes et Modelisation des Sol ides, Ecole Centrale Paris, CNRS-UMR8580, Grande voie dees vignes, 92295 Chatenay-Malabry Cedex, France;

Laboratoire de Physico-Chimie de l'Etat Solide, ICMMO, CNRS, UMR8648, Universite Paris-Sud. Bat 414, 91405 Orsay, France;

Laboratoire de Physico-Chimie de l'Etat Solide, ICMMO, CNRS, UMR8648, Universite Paris-Sud. Bat 414, 91405 Orsay, France;

Synchrotron Radiation Section, Bhabha Atomic Research Centre. Mumbai 400085, India;

Synchrotron Radiation Section, Bhabha Atomic Research Centre. Mumbai 400085, India;

Synchrotron Radiation Section, Bhabha Atomic Research Centre. Mumbai 400085, India;

Laboratoire de Physico-Chimie de l'Etat Solide, ICMMO, CNRS, UMR8648, Universite Paris-Sud. Bat 414, 91405 Orsay, France;

Department of Physics, Indian Institute of Science, Bangalore 560012. India;

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infrared and raman spectra; crystallographic aspects of phase transformations; pressure effects;

机译：红外和拉曼光谱;相变的晶体学方面;压力效应;

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Low-temperature and high-pressure Raman and x-ray studies of pyrochlore Tb_2Ti_2O_7: Phonon anomalies and possible phase transition

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