TY - JOUR
T1 - Phase separation in Nd2-χCeχCuO4. Evidence for superconductivity at a single composition
AU - Lightfoot, P.
AU - Richards, D. R.
AU - Dabrowski, B.
AU - Hinks, D. G.
AU - Pei, Shiyou
AU - Marx, D. T.
AU - Mitchell, A. W.
AU - Zheng, Ying
AU - Jorgensen, J. D.
PY - 1990/7/1
Y1 - 1990/7/1
N2 - A series of samples with bulk compositions Nd2-χCeχCuO4, 0≤χ≤0.25, have been examined by pulsed neutron and high-resolution synchrotron X-ray diffraction. The diffraction data show that single phase material is formed only for the undoped compound, Nd2CuO4, and (possibly) for the optimum superconducting composition, χ≈0.165. Other samples appear to be a mixture of this superconducting composition and non-superconducting material of other compositions. The phase separation cannot be explained in the context of an equilibrium phase diagram and, thus, must result from non-equilibrium behavior during synthesis.
AB - A series of samples with bulk compositions Nd2-χCeχCuO4, 0≤χ≤0.25, have been examined by pulsed neutron and high-resolution synchrotron X-ray diffraction. The diffraction data show that single phase material is formed only for the undoped compound, Nd2CuO4, and (possibly) for the optimum superconducting composition, χ≈0.165. Other samples appear to be a mixture of this superconducting composition and non-superconducting material of other compositions. The phase separation cannot be explained in the context of an equilibrium phase diagram and, thus, must result from non-equilibrium behavior during synthesis.
UR - http://www.scopus.com/inward/record.url?scp=0025462701&partnerID=8YFLogxK
U2 - 10.1016/0921-4534(90)90087-U
DO - 10.1016/0921-4534(90)90087-U
M3 - Article
AN - SCOPUS:0025462701
SN - 0921-4534
VL - 168
SP - 627
EP - 636
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 5-6
ER -