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M. Sieberer, H. Michor, S. Manalo, M. Della Mea, G. Hilscher, A. Grytsiv, P. Rogl:
"The effect of hydrogenation upon superconductivity in layered La₃Ni₂B₂N_3-δ^*";
Physica B: Condensed Matter, 378-380 (2006), S. 904 - 905.

The effect of hydrogenation upon superconductivity in layered La₃Ni₂B₂N_3-δ^*

M. Sieberer a, H. Michor a, S. Manalo a, M. Della Mea a, G. Hilscher a, A. Grytsiv b and P. Rogl b

a Institut für Festkörperphysik, T.U. Wien, A-1040 Wien, Austria
b Institut für Physikalische Chemie, Universität Wien, A-1090 Wien, Austria

Available online 28 February 2006.

Abstract

We report on hydrogenation of the layered boronitride superconductor La₃Ni₂B₂N_3-δ. Bulk specimen have been hydrogenated at 27 bar and temperatures ranging from 70 to 120°C yielding a series La₃Ni₂B₂N_3-δH_x with x=0.6 and 1.0 which exhibits a rather small volume expansion, Δ V/V~=0.05%/f.u. hydrogen. Specific heat and magnetic susceptibility studies of samples with x=0, 0.6, and 1.0 reveal a clear bulk effect of hydrogenation upon the superconducting properties, e.g. an increase of T_c by about 0.5 K, as well as an increase of H_c(T) and H_c2(T).

Keywords: Boronitrides; Superconductivity; Hydrogen

PACS classification codes: 74.70.Dd; 74.62.Dh; 74.25.Bt

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05938267

http://dx.doi.org/10.1016/j.physb.2006.01.420