Spin Dependent Hopping in Ti Doped La_(0.67)Ca_(0.33)MnO_3

【Author】

Huang Baoxin~(1,2), Liu Yihua~(1*),Zhang Ruzhen(1), Yuan Xiaobo(~(1), Wang Chengjian), Mei Liangmo(~(1)(1.Department of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;2.Department of Physics, Weifang University, Weifang 261061,China)

【Abstract】

A systematic investigation of the magnetic and transport properties of Ti doped La_(0.67)Ca_(0.33)MnO_3 was reported. The Ti substitution for Mn ions results in a reduction in ferromagnetism and conductivity. The metal-insulator transition temperature is close to Curie temperature which decreases from 274 to 82 K as x increases from 0 to 0.17. The most important effect of Ti doping is to introduce spin clusters in the samples due to the distortion of local lattice and the inhomogeneous magnetic structure induced primarily by the random distribution of Mn ions. A maximum magnetoresistance ratio as large as 90% in 1 T at 122 K was obtained for the sample with x=0.055, which is four times larger than that obtained for LCMO sample at 272 K. There is a remarkable field-history dependent MR in the cooling process for the doped samples while such phenomenon disappears in the warming run. The resistivity follows well the variable range hopping behavior in paramagnetic state. Both the size effect and spin dependent hopping of carriers between the spin clusters should be considered in this system.

【Keywords】

ceramic materials; colossal magnetoresistance; spin cluster; rare earths

References

To explore the background and basis of the node document

Springer Journals Database

Total: 19 articles

  • [1] WagnerP ,;GordonI ;TrappeniersL ,etal, Spin depen denthoppingandcolossalnegativemagnetoresistanceinepitaxialNd0.52Sr0.48MnO3 filmsinfieldsupto50T, Phys.Rev.Lett, Physics Review Letters (Physics Review Letters)
  • [2] OkamotoS ,;IshiharaS ;MaekawaS ,etal, Phasetransi tioninperovskitemanganiteswithorbitaldegreeoffree dom, Phys.Rev.B, Physical Review B Condensed Matter and Materials Physics (Physical Review B Condensed Matter and Materials Physics)
  • [3] MahendiranR ,;MaignanA ;HervieuM ,etal, Anoma lousmagnntotransportinPr0.5Ca0.5Mn0.99Cr0.01O3, Appl.Phys.Lett, Applied Physics Letters (Applied Physics Letters)
  • [4] HayashiT ,;MiuraN ;NodaK ,etal, Field inducedor bitalorder disordertransitioninanA typeantiferromag neticmanganite:High fieldstudyofNd0.45Sr0.55MnO3, Phys.Rev.B, Physical Review B Condensed Matter and Materials Physics (Physical Review B Condensed Matter and Materials Physics)

More>>

Similar documents

Documents that have the similar content to the node document

More>>