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Probing the involvement of non-magnetic Sr ion in the ferromagnetic transition of SrRuO3, using XAFS

Debdutta Lahiri1, Tomohiro Shibata2,3, Soma Chattopadhyay2,3, Ravi Shankar Singh4, Surinder M Sharma1 and Kalobaran Maiti4

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Recent calculations by Maiti et al. have shown that non-magnetic ions like Sr/Ca in Sr/Ca ruthenates may not be mere spectators in the magnetic transitions but their strong hybridization with O atoms may modify the magnetic ground state by distorting the Ru-O-Ru bond angle. Our XAFS results at Sr and Ru K-edges on SrRuO3 indeed demonstrate that the Debye Waller factor for the Sr-coupled bonds viz. Sr-Sr evolve most significantly across the ferromagnetic transition, almost replicating the magnetization curve while the Ru-octahedra evolves only gradually. This clearly establishes the definite role of Sr disorder in the ferromagnetic transition.


PACS

75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)

78.70.Dm X-ray absorption spectra

75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

61.50.Lt Crystal binding; cohesive energy

61.05.cj X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 1 (2009)



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