Pressure effects on magnetic and structural properties of pure and substituted SrRuO{sub 3}.
Pressure effects on magnetic and structural properties of pure and substituted SrRuO{sub 3}.
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DOI：
10.1103/physrevb.77.104410
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发表时间：
2008-03
影响因子：
3.7
通讯作者：
J. Piętosa;B. Dabrowski;A. Wisniewski;R. Puźniak;R. Kiyanagi;T. Maxwell;J. Jorgensen
中科院分区：
文献类型：
--
作者：
J. Piętosa;B. Dabrowski;A. Wisniewski;R. Puźniak;R. Kiyanagi;T. Maxwell;J. Jorgensen
An influence of hydrostatic pressure on phase transition temperature T{sub C}, spontaneous magnetization M{sub 0}, coercive field H{sub C}, and remanent magnetization M{sub R}, has been investigated for the parent perovskite SrRuO{sub 3} and substituted ruthenates with decreased (La{sub 0.2}Sr{sub 0.8}RuO{sub 3},SrRu{sub 0.9}Mn{sub 0.1}O{sub 3}) and increased (SrRu{sub 0.9}Cr{sub 0.1}O{sub 3}) Curie temperature. We have observed a decrease of T{sub C} with pressure for all of the studied samples, however, the lowering of T{sub C} with pressure (dT{sub C}/dP) is not correlated with the value of T{sub C} at ambient pressure. The spontaneous magnetization and coercive field remain unchanged for most of the samples, except the La{sub 0.2}Sr{sub 0.8}RuO{sub 3} sample, where spontaneous magnetization decreases with increasing pressure. For SrRuO{sub 3}, structural study by neutron powder diffraction shows clear contraction of the Ru-O bond lengths under external pressure whereas bond angles and the orthorhombic distortion remain constant at 295 and 50 K. The weakening of the ferromagnetic interactions with increasing pressure is consistent with complex band structure effects through a combination of modulation of the hybridization caused by contraction of the Ru-O bonds and with the significant role of the direct Ru-Ru interactions.
An influence of hydrostatic pressure on phase transition temperature T{sub C}, spontaneous magnetization M{sub 0}, coercive field H{sub C}, and remanent magnetization M{sub R}, has been investigated for the parent perovskite SrRuO{sub 3} and substituted ruthenates with decreased (La{sub 0.2}Sr{sub 0.8}RuO{sub 3},SrRu{sub 0.9}Mn{sub 0.1}O{sub 3}) and increased (SrRu{sub 0.9}Cr{sub 0.1}O{sub 3}) Curie temperature. We have observed a decrease of T{sub C} with pressure for all of the studied samples, however, the lowering of T{sub C} with pressure (dT{sub C}/dP) is not correlated with the value of T{sub C} at ambient pressure. The spontaneous magnetization and coercive field remain unchanged for most of the samples, except the La{sub 0.2}Sr{sub 0.8}RuO{sub 3} sample, where spontaneous magnetization decreases with increasing pressure. For SrRuO{sub 3}, structural study by neutron powder diffraction shows clear contraction of the Ru-O bond lengths under external pressure whereas bond angles and the orthorhombic distortion remain constant at 295 and 50 K. The weakening of the ferromagnetic interactions with increasing pressure is consistent with complex band structure effects through a combination of modulation of the hybridization caused by contraction of the Ru-O bonds and with the significant role of the direct Ru-Ru interactions.