Temperature-dependent Raman and x-ray studies of the spin-ice pyrochlore Dy2Ti2O7 and nonmagnetic pyrochlore Lu2Ti2O7

Saha  S; Singh  S; Dkhil  BDhar  SSuryanarayanan  RDhalenne  GRevcolevschi  ASood  AK

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Temperature-dependent Raman and x-ray studies of the spin-ice pyrochlore Dy2Ti2O7 and nonmagnetic pyrochlore Lu2Ti2O7

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We present here temperature-dependent Raman, x-ray diffraction, and specific heat studies between room temperature and 12 K on single crystals of spin-ice pyrochlore compound Dy2Ti2O7 and its nonmagnetic analog Lu2Ti2O7. Raman data show a "new" band not predicted by factor group analysis of Raman-active modes for the pyrochlore structure in Dy2Ti2O7, appearing below a temperature of T-c=110 K with a concomitant contraction of the cubic unit cell volume as determined from the powder x-ray diffraction analysis. Low-temperature Raman experiments on O-18-isotope substituted Dy2Ti2O7 confirm the phonon origin of the new mode. These findings, absent in Lu2Ti2O7, suggest that the room-temperature cubic lattice of the pyrochlore Dy2Ti2O7 undergoes a "subtle" structural transformation near T-c. We find anomalous redshift of some of the phonon modes in both the Dy2Ti2O7 and the Lu2Ti2O7 as the temperature decreases, which is attributed to strong phonon-phonon anharmonic interactions.

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《Physical review, B. Condensed matter and materials physics》 |2008年第21期|214102-1-214102-10-0|共10页
作者
Saha S; Singh S; Dkhil BDhar SSuryanarayanan RDhalenne GRevcolevschi ASood AK;
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作者单位

[Saha, S;

Sood, AK] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India;

[Singh, SSuryanarayanan, RDhalenne, GRevcolevschi, A] Univ Paris 11, CNRS, UMR8648, ICMMO,Lab Physicochim Etat Solide, F-91405 Orsay, France[Dkhil, B] Ecole Cent Paris, CNRS, UMR8580, Lab Struct Proprietes & Modelisat Solides, F-92295 Chatenay Malabry, France[Dhar, S] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India;

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正文语种英语
中图分类固体物理学;
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crystal structure; dysprosium compounds; lutetium compounds; phonon spectra; phonon-phonon interactions; Raman spectra; solid-state phase transformations; specific heat; X-ray diffraction; RARE-EARTH TITANATES; GEOMETRICAL FRUSTRATION; OPTICAL PHONONS; HO2TI2O7; FERROMAGNET; SCATTERING; PRESSURE; SPECTRA; SYSTEM; PHASE;

Temperature-dependent Raman and x-ray studies of the spin-ice pyrochlore Dy2Ti2O7 and nonmagnetic pyrochlore Lu2Ti2O7

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