Spectroscopic observation of strain-assisted ${T}_{C}$ enhancement in EuO upon Gd doping

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Spectroscopic observation of strain-assisted $T_{C}$ enhancement in EuO upon Gd doping

S. G. Altendorf, N. Hollmann, R. Sutarto, C. Caspers, R. C. Wicks, Y.-Y. Chin, Z. Hu, H. Kierspel, I. S. Elfimov, H. H. Hsieh, H.-J. Lin, C. T. Chen, and L. H. Tjeng

Phys. Rev. B 85, 081201(R) – Published 22 February 2012

Abstract

The origin of the Curie temperature enhancement of EuO upon Gd doping is studied by using soft x-ray absorption spectroscopy on epitaxial pure and Gd-doped EuO thin films. Temperature- and doping-dependent changes in the oxygen K edge spectra provide information about the correlation of magnetism and lattice. Band-structure calculations reveal that these spectral changes as well as the increase of the Curie temperature to 125 K for Gd-doped EuO cannot be explained by electron doping alone. The compression of the crystal lattice due to the incorporation of the smaller Gd $^{3 +}$ ions plays also an important role.

Received 28 November 2011

DOI:https://doi.org/10.1103/PhysRevB.85.081201

Authors & Affiliations

S. G. Altendorf^1,2, N. Hollmann², R. Sutarto^1,*, C. Caspers^1,†, R. C. Wicks³, Y.-Y. Chin^1,2, Z. Hu^1,2, H. Kierspel¹, I. S. Elfimov³, H. H. Hsieh⁴, H.-J. Lin⁵, C. T. Chen⁵, and L. H. Tjeng^1,2

¹II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
²Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, D-01187 Dresden, Germany
³Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
⁴Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan
⁵National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan

^*Present address: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1 and Canadian Light Source, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N0X4.
^†Present address: Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, D-52425 Jülich, Germany.

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Vol. 85, Iss. 8 — 15 February 2012

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Physical Review B

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