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57Fe and 119Sn Mössbauer studies on La1.25Nd0.6Sr0.15CuO4: Evidence for local magnetic ordering below ≂32 K (abstract)
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57Fe and 119Sn Mössbauer effect studies on 0.5 at. % 57Fe or 119Sn doped nonsuperconducting La1.25Nd0.6Sr0.15CuO4 in the temperature region 300 K≥T≥4.2 K reveal an onset of local magnetic ordering occurring at TM≂32 K for both 57Fe as well as 119Sn-doped samples. The local magnetic ordering shows up in the presence of a very large transferred hyperfine field of Bthf≂11.0(5) T at the 119Sn nuclei. Since such a large field is present in neither antiferromagnetic La2CuO4 superconducting La1.85Sr0.15CuO4 nor overdoped La2−xSrxCuO4 (x=0.4), the occurrence of such local spin correlations seems to be a signature of the nonsuperconducting low temperature tetragonal phase of La1.25Nd0.6Br0.15CuO4.
Title: 57Fe and 119Sn Mössbauer studies on La1.25Nd0.6Sr0.15CuO4: Evidence for local magnetic ordering below ≂32 K (abstract)
Description:
57Fe and 119Sn Mössbauer effect studies on 0.
5 at.
% 57Fe or 119Sn doped nonsuperconducting La1.
25Nd0.
6Sr0.
15CuO4 in the temperature region 300 K≥T≥4.
2 K reveal an onset of local magnetic ordering occurring at TM≂32 K for both 57Fe as well as 119Sn-doped samples.
The local magnetic ordering shows up in the presence of a very large transferred hyperfine field of Bthf≂11.
0(5) T at the 119Sn nuclei.
Since such a large field is present in neither antiferromagnetic La2CuO4 superconducting La1.
85Sr0.
15CuO4 nor overdoped La2−xSrxCuO4 (x=0.
4), the occurrence of such local spin correlations seems to be a signature of the nonsuperconducting low temperature tetragonal phase of La1.
25Nd0.
6Br0.
15CuO4.
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