TY - JOUR
T1 - Effects of Ca-doping on the transport and magnetic properties of La1.4Sr1.6Mn2O7
AU - Kuo, C. M.
AU - Wu, S. Y.
AU - Li, W. H.
AU - Lee, K. C.
AU - Yang, H. D.
N1 - Funding Information:
The work at NCU was supported by the National Science Council of the Republic of China under Grant No. NSC 88-2112-M-008-002. The work at NSYSU was supported by the National Science Council of the Republic of China under Grant No. NSC 88-2112-M-011-007.
PY - 2000/2
Y1 - 2000/2
N2 - Detailed structural analysis, DC electric resistivity, and AC magnetic susceptibility measurements have been performed to study the lattice, transport, and magnetic properties of polycrystalline La1.4(Sr1-xCax)1.6Mn2O7, with x = 0, 0.1, 0.2, and 0.3. We concentrate on the effects that resulted from the partial replacement of Sr2+ ions by smaller Ca2+ ions. All four compounds are single phase, with a structure that may be well-described using a tetragonal symmetry of space group I4/mmm. Ca doping causes the insulator-to-metal and paramagnetic-to-ferromagnetic transitions to occur at lower temperatures and the system re-enters the insulating state at lower temperatures. Several peaks are clearly seen in the temperature dependence of the AC susceptibility. Based on their behavior under an applied DC field, these peaks may be grouped into three types of different origin associated with charge ordering, Mn spin ordering, and magnetic fluctuations.
AB - Detailed structural analysis, DC electric resistivity, and AC magnetic susceptibility measurements have been performed to study the lattice, transport, and magnetic properties of polycrystalline La1.4(Sr1-xCax)1.6Mn2O7, with x = 0, 0.1, 0.2, and 0.3. We concentrate on the effects that resulted from the partial replacement of Sr2+ ions by smaller Ca2+ ions. All four compounds are single phase, with a structure that may be well-described using a tetragonal symmetry of space group I4/mmm. Ca doping causes the insulator-to-metal and paramagnetic-to-ferromagnetic transitions to occur at lower temperatures and the system re-enters the insulating state at lower temperatures. Several peaks are clearly seen in the temperature dependence of the AC susceptibility. Based on their behavior under an applied DC field, these peaks may be grouped into three types of different origin associated with charge ordering, Mn spin ordering, and magnetic fluctuations.
UR - http://www.scopus.com/inward/record.url?scp=0034135341&partnerID=8YFLogxK
U2 - 10.1016/S0304-8853(99)00669-1
DO - 10.1016/S0304-8853(99)00669-1
M3 - 會議論文
AN - SCOPUS:0034135341
SN - 0304-8853
VL - 209
SP - 142
EP - 144
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - 1-3
T2 - Proceedings of the 1999 International Symposium on Advanced Magnetic Technologies (ISAMT'99)
Y2 - 24 May 1999 through 25 May 1999
ER -