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Article
Thermopower enhancement by encapsulating cerium in clathrate cages
Clathrate materials have been the subject of intense investigation because of their beneficial properties, in particular their low thermal conductivities. Now, improved thermopower at high temperatures arising...
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Article
The break-up of heavy electrons at a quantum critical point
The point at absolute zero where matter becomes unstable to new forms of order is called a quantum critical point (QCP). The quantum fluctuations between order and disorder1,2,3,4,5 that develop at this point ind...
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Article
Low Temperature Specific Heat of the Kondo-Semimetal CeNiSn in Zero and Applied Magnetic Fields
The specific heat of several CeNiSn single crystals of various purity has been measured in the temperature range from 25 mK to 5 K and in magnetic fields from zero to 7 Tesla. At very low temperatures (below ∼.....
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Article
The influence of impurities and alloying in the Kondo semimetal CeNiSn as seen by μSR
The temperature dependence of the muon spin relaxation rate \lambda was measured in two samples of CeNiSn with markedly different impurity content and in the quasi‐ternary compounds CePtxNi1-xSn (x=0.12,\ ,0.2) a...
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Article
Spin fluctuations and magnetic order in the heavy fermion compound CePt2Sn2
We present zero and longitudinal field μ SR measurements of single crystal and polycrystalline specimens of the heavy fermion compound CePt2Sn2. Above 1 K the behaviour of the two samples is indistinguishable; th...
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Article
Tunneling of hydrogen in Nb(CH)0.0002
From neutron spectroscopic measurements, we determine a value of (162±4) μeV for the tunneling matrix element of trapped H in Nb(CH)0.0002. The matrix element is about 30% smaller than that of (226±4) μeV for H t...
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Chapter and Conference Paper
The Influence of Electrons on the Tunneling State of a Hydrogen Atom in a Metal
The thermal destruction of a tunneling state in a molecular crystal, which becomes observable in a neutron spectroscopic experiment say above 10 K, is generally attributed to interactions with phonons. If the ...
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Chapter and Conference Paper
H and D Tunneling in Nb: Dependence on Defect Concentration and Trap** Center
Low-temperature tunneling of H or D interstitials trapped by impurity atoms such as O or N in Nb has been investigated by various methods such as specific heat, thermal conductivity, ultrasonic (anelastic) and...
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Chapter and Conference Paper
H Tunneling and Local Diffusion in NbOxHy
The presently best understood example of low-temperature H tunneling in metals is represented by H interstitials in Nb that are trapped (below ~150 K /1,2/) by impurity atoms such as 0 or N. The tunneling beha...
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Article
Tunneling motions of methyl groups in manganese acetate tetrahydrate
The temperature dependence of the tunneling motions of the methyl groups in Manganese Acetate Tetrahydrate has been studied by high resolution inelastic neutron scattering in a range between 0.06 K and 40 K. T...
