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ЖЭТФ, Том 130, Вып. 3, стр. 442 (Сентябрь 2006)
(Английский перевод - JETP, Vol. 103, No 3, p. 385, September 2006 доступен on-line на www.springer.com )

MAGNETIC CHARACTERIZATION OF A HYDROGEN PHASE TRAPPED INSIDE DEEP DISLOCATION CORES IN A HYDROGEN-CYCLED PdHx (x\approx 4.5\cdot 10-4) SINGLE CRYSTAL
Lipson A.G., Heuser B.J., Castano C.H., Lyakhov B.F., Tsivadze A.Yu.

Поступила в редакцию: 23 Марта 2006

PACS: 74.78.Fk, 74.10.+v, 61.72.-y

DJVU (212.4K) PDF (554K)

The magnetic characterization of Pd single crystals deformed by cycling in a hydrogen atmosphere has been performed. Based on evidence obtained from thermal desorption analysis, it is shown that the condensed hydrogen phase formed inside deep dislocation cores in PdHx (x =\text{H/Pd}\approx 4.5\cdot 10^{-4}) is tightly bound with a Pd matrix. The activation energy of hydrogen desorption from these cores was found to be as high as e=1.6 eV/H-atom, suggesting the occurrence of a strong band overlapping between Pd and H atoms. SQUID measurements carried out in a weak magnetic field (H<5.0 Oe) showed an anomalous diamagnetic contribution to the DC and AC magnetic susceptibilities of the PdHx sample at T<30 K resulting in the presence of the hydrogen phase. It is suggested that the anomalous diamagnetic response in PdHx is caused by the presence of a hydrogen dominant phase, tightly bound with a Pd matrix inside the dislocation cores (``nanotubes'').

 
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