151Eu Mössbauer and magnetic studies on magnetic superconductor EuSr2 Ru1 - x Cu2 + x O8 ( - 0.1 ≤ x ≤ 0.25 )

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151Eu Mössbauer and magnetic studies on magnetic superconductor EuSr2 Ru1 - x Cu2 + x O8 ( - 0.1 ≤ x ≤ 0.25 )

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Title: 151Eu Mössbauer and magnetic studies on magnetic superconductor EuSr2 Ru1 - x Cu2 + x O8 ( - 0.1 ≤ x ≤ 0.25 )
Author: RAKESH KUMAR; TOMY, CV; PAULOSE, PL; NAGARAJAN, R
Abstract: Magnetic and 151Eu Mössbauer studies have been carried out on the ruthenocuprate magnetic superconductors,EuSr2Ru1-xCu2+xO8(-0.1≤ x ≤0.25). The magnetic ordering temperature (TM) decreases from 135 K for x=0.0 to 125 K for x=0.25 and the superconducting transition temperature increases from 19 K (onset for x=0.0) to 33 K (x=0.1). The compounds with x<0 do not show superconductivity down to 2 K but show an increase in TM. The 151Eu Mössbauer studies show that the Eu ions are in 3+ (4f6,J=0) and hence in the nonmagnetic state in these compounds. The observation of a broadening in the 151Eu Mössbauer absorption spectra below the magnetic ordering temperature indicates a small transferred magnetic hyperfine field at the Eu site.
URI: 10.1016/j.physb.2006.01.141
http://hdl.handle.net/10054/1279
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1279
Date: 2006


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