Specific-heat study for ferromagnetic and antiferromagnetic phases in SrRu_{1-x}Mn_xO3

Abstract

Low-temperature electronic states in SrRu_{1-x}Mn_xO_3 for x <= 0.6 have been investigated by means of specific-heat C_p measurements. We have found that a jump anomaly observed in C_p at the ferromagnetic (FM) transition temperature for SrRuO_3 changes into a broad peak by only 5% substitution of Mn for Ru. With further doping Mn, the low-temperature electronic specific-heat coefficient gamma is markedly reduced from the value at x=0 (33 mJ/K^2 mol), in connection with the suppression of the FM phase as well as the enhancement of the resistivity. For x >= 0.4, gamma approaches to ~ 5 mJ/K^2 mol or less, where the antiferromagnetic order with an insulating feature in resistivity is generated. We suggest from these results that both disorder and reconstruction of the electronic states induced by doping Mn are coupled with the magnetic ground states and transport properties.

4 pages, 2 figures, submitted to the proceedings of ICM2009 (Karlsruhe)

References in corpus (5)

• Transport Properties, Thermodynamic Properties, and Electronic Structure of SrRuO3
• Non-Fermi liquid behavior of SrRuO_3 -- evidence from infrared conductivity
• From itinerant ferromagnetism to insulating antiferromagnetism: A magnetic and transport study of single crystal SrRu1-xMnxO3
• Structural and physical properties of $SrM{n}_{1-x}R{u}_x{O}_3$ perovskites
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Cited by in corpus (1)

• Low-temperature specific heat for ferromagnetic and antiferromagnetic orders in CaRu1-xMnxO3