Publication Date:
2016-11-01
Description:
Author(s): W. Schottenhamel, M. Abdel-Hafiez, R. Fittipaldi, V. Granata, A. Vecchione, M. Hücker, A. U. B. Wolter, and B. Büchner The Ruddlesden Popper series Sr n + 1 Ru n O 3 + n + 1 contains highly interesting physical phenomena depending on the number of RuO 2 layers in the unit cell, spanning from unconventional superconductivity for the n =1 member Sr 2 RuO 4 to itinerant ferromagnetism in the infinite-layer system SrRuO 3 . Obviously, the unique interplay between electronic, spin, and lattice degrees of freedom in this group of correlated itinerant electron systems leads to a tremendous change of the physical properties. This is also demonstrated by anisotropic and orbital-dependent magnetism and a strong spin-phonon coupling found in many members within the series. This paper focusses on triple-layer Sr 4 Ru 3 O 10 , which becomes ferromagnetic at T c ∼ 105 K and shows a metamagnetic transition below T * ∼ 50 K for a magnetic field along the a b plane. The authors investigate the magnetoelastic properties of this compound as a function of temperature and magnetic field. The high-resolution thermal expansion and magnetostriction measurements indicate a highly anisotropic response with a specific rearrangement of the crystal lattice in fields parallel and perpendicular to the c axis. Finally, they reconstruct the T - H phase diagram, which shows a new feature suggestive of the multiple-orbital character of Sr 4 Ru 3 O 10 , where both the ferromagnetic ( d x y ) and the metamagnetic orbitals ( d x z ; y z ) coexist and interact. [Phys. Rev. B 94, 155154] Published Mon Oct 31, 2016
Keywords:
Electronic structure and strongly correlated systems
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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