Ontology type: schema:Chapter
1987
AUTHORS ABSTRACTHydrogen interstitials in niobium, trapped by additional impurities such as nitrogen or oxygen, form tunneling systems with energy splittings E ≈ 2 K. This has been demonstrated by low-temperature specific heat measurements /1,2,3/, by inelastic neutron scattering experiments /4,5/, and also by sound velocity measurements /6/. Additionally, hydrogen tunneling systems give rise to relaxation processes resulting in a peak of the ultrasonic attenuation at 3K if the niobium host is in the superconducting state /7,8,9/. By suppressing superconductivity with a magnetic field this attenuation peak vanishes, proving that the dynamics of the tunneling systems are governed by their interaction with conduction electrons /8,9/. Recently this important role of the conduction electrons has also been verified in inelastic neutron scattering experiments /5/. More... »
PAGES163-166
Quantum Aspects of Molecular Motions in Solids
ISBN
978-3-642-71916-5
978-3-642-71914-1
http://scigraph.springernature.com/pub.10.1007/978-3-642-71914-1_28
DOIhttp://dx.doi.org/10.1007/978-3-642-71914-1_28
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