Spin gap inCeFe4Sb12studied by heat capacity and inelastic neutron scattering

2007 ◽  
Vol 76 (17) ◽  
Author(s):  
R. Viennois ◽  
L. Girard ◽  
L. C. Chapon ◽  
D. T. Adroja ◽  
R. I. Bewley ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Spin Gap

Inelastic neutron scattering study of the spin-gap behavior in CuTeOBr

2005 ◽  
Vol 359-361 ◽  
pp. 1219-1221 ◽  
Author(s):  
S.J. Crowe ◽  
S. Majumdar ◽  
M.R. Lees ◽  
D. McK. Paul ◽  
D.T. Adroja ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Spin Gap ◽  
Scattering Study ◽  
Neutron Scattering Study

Inelastic neutron scattering and heat capacity studies of ferromagnetic PrInNi4

2006 ◽  
Vol 385-386 ◽  
pp. 41-43 ◽  
Author(s):  
H.C. Walker ◽  
K.A. McEwen ◽  
D.T. Adroja ◽  
J.-G. Park ◽  
Y.S. Kwon ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron

Molecular Vibrations as the Origin of Solid State Effects in Borohydrides

2009 ◽  
Vol 1216 ◽  
Author(s):  
Andreas Borgschulte ◽  
Robin Gremaud ◽  
Florian Buchter ◽  
Zbigniew Lodziana ◽  
Andreas Züttel ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Solid State ◽  
Thermodynamic Properties ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Vibrational Properties ◽  
Vibrational Modes ◽  
The Impact ◽  
Specific Phase

AbstractIn this proceeding, we discuss measurements of the vibrational properties of hydrides using inelastic neutron scattering (INS) and the impact of the vibrational modes on the thermodynamic properties. We compare the heat capacity of PdH0.63 and LiBH4 as measured calorimetrically to that derived form INS spectra. We show that the vibrational properties of Ca(BH4)2 depend on the specific phase and hitherto determine their stability.

Inelastic neutron scattering study of the spin-gap cuprateβ−AgCuPO4

2007 ◽  
Vol 76 (13) ◽  
Author(s):  
Masashi Hase ◽  
Masaaki Matsuda ◽  
Kazuhisa Kakurai ◽  
Kiyoshi Ozawa ◽  
Hideaki Kitazawa ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Spin Gap ◽  
Scattering Study ◽  
Neutron Scattering Study

scholarly journals Inelastic Neutron Scattering Investigations of an Anisotropic Hybridization Gap in the Kondo Insulators: CeT2Al10 (T=Fe, Ru and Os)

2016 ◽  
Vol 257 ◽  
pp. 11-25 ◽  
Author(s):  
Devashibhai T. Adroja ◽  
Y. Muro ◽  
Toshiro Takabatake ◽  
M.D. Le ◽  
H.C. Walker ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Spin Wave ◽  
Inelastic Neutron Scattering ◽  
Wave Spectrum ◽  
Magnetic Ordering ◽  
Inelastic Neutron ◽  
Spin Gap ◽  
Kondo Insulators ◽  
Anisotropic Exchange ◽  
Magnetic Ordering Temperature

The recent discovery of topological Kondo insulating behaviour in strongly correlated electron systems has generated considerable interest in Kondo insulators both experimentally and theoretically. The Kondo semiconductors CeT2Al10 (T=Fe, Ru and Os) possessing a c-f hybridization gap have received considerable attention recently because of the unexpected high magnetic ordering temperature of CeRu2Al10 (TN=27 K) and CeOs2Al10 (TN=28.5 K) and the Kondo insulating behaviour observed in the valence fluctuating compound CeFe2Al10 with a paramagnetic ground state down to 50 mK. We are investigating this family of compounds, both in polycrystalline and single crystal form, using inelastic neutron scattering to understand the role of anisotropic c-f hybridization on the spin gap formation as well as on their magnetic properties. We have observed a clear sign of a spin gap in all three compounds from our polycrystalline study as well as the existence of a spin gap above the magnetic ordering temperature in T=Ru and Os. Our inelastic neutron scattering studies on single crystals of CeRu2Al10 and CeOs2Al10 revealed dispersive gapped spin wave excitations below TN. Analysis of the spin wave spectrum reveals the presence of strong anisotropic exchange, along the c-axis (or z-axis) stronger than in the ab-plane. These anisotropic exchange interactions force the magnetic moment to align along the c-axis, competing with the single ion crystal field anisotropy, which prefers moments along the a-axis. In the paramagnetic state (below 50 K) of the Kondo insulator CeFe2Al10, we have also observed dispersive gapped magnetic excitations which transform into quasi-elastic scattering on heating to 100 K. We will discuss the origin of the anisotropic hybridization gap in CeFe2Al10 based on theoretical models of heavy-fermion semiconductors.

Sign in / Sign up

Export Citation Format

Share Document