Zobrazeno 1 - 10
of 147
pro vyhledávání: '"Schober, Helmut"'
Autor:
Singh, Baltej, Gupta, Mayanak K., Mittal, Ranjan, Zbiri, Mohamed, Ravindran, Thoguluva R., Schober, Helmut, Chaplot, Samrath L.
Cyanide based framework compounds are known to show large negative thermal expansion behaviour. Here we report the phonon and anomalous lattice behavior of two metal cyanide framework compounds i.e. KMnAg3(CN)6 and KNiAu3(CN)6. We have studied the ro
Externí odkaz:
http://arxiv.org/abs/1908.07289
Autor:
Gupta, Mayanak K., Singh, Baltej, Mittal, Ranjan, Zbiri, Mohamed, Cairns, Andrew B., Goodwin, Andrew L., Schober, Helmut, Chaplot, Samrath L.
Publikováno v:
Phys. Rev. B 96, 214303 (2017)
We present temperature dependent inelastic neutron scattering measurments, accompanied byab-initio calculations of phonon spectra and elastic properties as a function of pressure to understand anharmonicity of phonons and to study the mechanism of ne
Externí odkaz:
http://arxiv.org/abs/1705.10215
Autor:
Singh, Baltej, Gupta, Mayanak Kumar, Mittal, Ranjan, Zbiri, Mohamed, Rols, Stephane, Patwe, Sadequa Jahedkhan, Achary, Srungarpu Nagabhusan, Schober, Helmut, Tyagi, Avesh Kumar, Chaplot, Samrath Lal
Publikováno v:
Journal of Applied Physics 121, 085106 (2017)
Beta eucryptite (LiAlSiO4) shows one-dimensional super-ionic conductivity as well as anisotropic thermal expansion behavior. We have performed inelastic neutron scattering measurements in beta eucryptite over 300 to 900 K and calculated the phonon sp
Externí odkaz:
http://arxiv.org/abs/1602.08285
Autor:
D'Astuto, Matteo, Heid, Rolf, Renker, Burkhard, Weber, Frank, Schober, Helmut, Omar, De La Pena Seaman, Karpinski, Janusz, Zhigadlo, Nikolai D., Bossak, Alexei, Krisch, Michael
Publikováno v:
Phys. Rev. B 93, 180508 (2016)
Superconducting MgB$\_2$ shows an E$\_{2g}$ zone center phonon, as measured by Raman spectroscopy, that is very broad in energy and temperature dependent. The Raman shift and lifetime show large differences with the values elsewhere in the Brillouin
Externí odkaz:
http://arxiv.org/abs/1512.07065
Autor:
Gupta, Mayanak Kumar, Mittal, Ranjan, Zbiri, Mohamed, Sharma, Neetika, Rols, Stephane, Schober, Helmut, Chaplot, Samrath Lal
Publikováno v:
J. Mater. Chem. C 3, 11717 (2015)
We have carried out temperature-dependent inelastic neutron scattering measurements of YMnO3 over the temperature range 50 - 1303 K, covering both the antiferromagnetic to paramagnetic transition (70 K), as well as the ferroelectric to paraelectric t
Externí odkaz:
http://arxiv.org/abs/1505.04064
Publikováno v:
In Renewable and Sustainable Energy Reviews December 2020 134
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We present neutron scattering measurements of the dynamic structure factor, $S(Q,\omega)$, of amorphous solid helium confined in 47 $\AA$ pore diameter MCM-41 at pressure 48.6 bar. At low temperature, $T$ = 0.05 K, we observe $S(Q,\omega)$ of the con
Externí odkaz:
http://arxiv.org/abs/1211.2014
Autor:
Zbiri, Mohamed, Mittal, Ranjan, Rols, Stephane, Su, Yixi, Xiao, Yinguo, Schober, Helmut, Chaplot, Samrath L., Johnson, Mark R., Chatterji, Tapan, Inoue, Yasunori, Matsuishi, Satoru, Hosono, Hideo, Brueckel, Thomas
Publikováno v:
J. Phys.: Condens. Matter 22 (2010) 315701
To shed light on the role of magnetism on the superconducting mechanism of the oxygen-free FeAs pnictides, we investigate the effect of magnetic ordering on phonon dynamics in the low-temperature orthorhombic parent compounds, which present a spin-de
Externí odkaz:
http://arxiv.org/abs/1007.1711
Publikováno v:
Journal of Non-Crystalline Solids 352 (2006) 4988-4993
Based on neutron wide-angle diffraction and small-angle neutron scattering experiments, we show that there is a correlation between the preparational conditions of amorphous ice structures, their microscopic structural properties, the extent of heter
Externí odkaz:
http://arxiv.org/abs/cond-mat/0602207