Influence of pressure on magnetic properties of (Sr, La) (Ru, A)O3 for A = Cr, Mn

Jaroslaw Pietosa 1Andrzej Wisniewski 1Roman Puzniak 1Stanislaw Kolesnik 2Manassa Majjiga 2Bogdan Dabrowski 2

1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
2. Northern Illinois University (NIU), Faraday Hall W216, De Kalb, Il 60115, United States

Abstract

An influence of hydrostatic pressure on phase transition temperature, TC, and spontaneous magnetisation, M0, of selected perovskite ruthenates (SrRuO3, La0.2Sr0.8RuO3, SrRu0.9Mn0.1O3 and SrRu0.9Cr0.1O3) has been determined from magnetic measurements performed in the pressure interval of 0-12 kbar. Decrease of TC with pressure has been found for all of the samples. The M0(P) remains unchanged for most of the samples, except the La0.2Sr0.8RuO3 sample, where M0 decreases with pressure. For La0.2Sr0.8RuO3, the pressure coefficient dTC/dP = -0.67 K/kbar is very similar to that of SrRuO3 (-0.68 K/kbar). For SrRu0.9Cr0.1O3 and SrRu0.9Mn0.1O3 the pressure coefficient dTC/dP is equal to about -0.5 K/kbar. The decrease of TC in SrRuO3 was reported earlier and explained in terms of strain effects. For La-substituted compound, a similar decrease of TC with increasing pressure is probably caused also by the strain effects. The decrease of TC with increasing pressure for both Cr-substituted and Mn-substituted samples indicates an overall band structure effect on TC for these hole-doped compounds. Since the pressure affects the Ru-O-Ru bond angles and the Ru-O bond lengths, and the ferromagnetism in ruthenates is sensitive to these parameters, a weakening of ferromagnetic interactions is, thus, consistent with complex band structure effects related to the modulation of the Ru-O hybridisation by the change of structural distortion.

 

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Presentation: Poster at E-MRS Fall Meeting 2006, Symposium K, by Jaroslaw Pietosa
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-16 09:31
Revised:   2009-06-07 00:44