Diamagnetism, transport, magnetothermoelectric power, and magnetothermal conductivity in electron-doped CaMn1-xVxO3 manganites

被引:51
作者
Ang, R.
Sun, Y. P. [1 ]
Ma, Y. Q.
Zhao, B. C.
Zhu, X. B.
Song, W. H.
机构
[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
[2] Chinese Acad Sci, Hefei High Magnet Field Lab, Hefei 230031, Peoples R China
基金
中国国家自然科学基金;
关键词
D O I
10.1063/1.2337557
中图分类号
O59 [应用物理学];
学科分类号
摘要
The effects of V doping on field-cooled magnetization M-FC(T), zero-field-cooled magnetization M-ZFC(T), resistivity rho, thermoelectric power S, and thermal conductivity kappa in manganites CaMn1-xVxO3 (0.02 <= x <= 0.08) have been investigated systematically. As the V doping level exceeds 0.02, an anomalous "diamagnetism" has been observed. It is suggested that the force generated by the orbit rotation of e(g) electron in Mn3+O6 octahedron makes the spin tilt, as a result, the vector sum of individual spins may be along or opposite to the direction of the applied magnetic field, and macroscopically, the average magnetization exhibits positive or negative values. In addition, the transport mechanism in the high and low temperature ranges is dominated by the small polaron conduction and the variable-range-hopping conduction, respectively, according to the fitting analysis of the temperature dependence of Seebeck coefficient S(T) and resistivity rho(T). Both S and kappa peaks appearing at low temperature is gradually suppressed by V doping. Additionally, obvious magnetothermoelectric power and magnetothermal conductivity are observed in the temperature region which an anomalous diamagnetism appears. The results are discussed based on spin-orbital coupling and spin-phonon coupling induced due to V doping, respectively. Moreover, the large thermoelectric figure of merit Z=S-2/rho kappa for the slightly V-doped sample suggests that the V-doped manganite may be a good candidate for thermoelectric materials. (c) 2006 American Institute of Physics.
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页数:11
相关论文
共 43 条
[1]   A STRUCTURAL PHASE-TRANSITION INDUCED BY AN EXTERNAL MAGNETIC-FIELD [J].
ASAMITSU, A ;
MORITOMO, Y ;
TOMIOKA, Y ;
ARIMA, T ;
TOKURA, Y .
NATURE, 1995, 373 (6513) :407-409
[2]   Magnetoresistance and magnetothermoelectric power of La0.5Pb0.5Mn1-xCrxO3 -: art. no. 104428 [J].
Banerjee, A ;
Pal, S ;
Bhattacharya, S ;
Chaudhuri, BK ;
Yang, HD .
PHYSICAL REVIEW B, 2001, 64 (10)
[3]   Ferromagnetism and large negative magnetoresistance in Bi1-xCaxMnO3 (x>=0.8) perovskite [J].
Chiba, H ;
Kikuchi, M ;
Kusaba, K ;
Muraoka, Y ;
Syono, Y .
SOLID STATE COMMUNICATIONS, 1996, 99 (07) :499-502
[4]   Evolution of the magnetic ground state in the electron-doped antiferromagnet CaMnO3 -: art. no. 014403 [J].
Cornelius, AL ;
Light, BE ;
Neumeier, JJ .
PHYSICAL REVIEW B, 2003, 68 (01)
[5]   Conduction channels and magnetoresistance in polycrystalline manganites [J].
de Andrés, A ;
García-Hernández, M ;
Martínez, JL .
PHYSICAL REVIEW B, 1999, 60 (10) :7328-7334
[6]   Strong influence of the Mn3+ content on the binding energy of the lattice polarons in manganese perovskites [J].
De Teresa, JM ;
Dorr, K ;
Muller, KH ;
Schultz, L ;
Chakalova, RI .
PHYSICAL REVIEW B, 1998, 58 (10) :R5928-R5931
[7]   EFFECTS OF DOUBLE EXCHANGE IN MAGNETIC CRYSTALS [J].
DEGENNES, PG .
PHYSICAL REVIEW, 1960, 118 (01) :141-154
[8]   Evidence for magnetic polarons in the magnetoresistive perovskites [J].
DeTeresa, JM ;
Ibarra, MR ;
Algarabel, PA ;
Ritter, C ;
Marquina, C ;
Blasco, J ;
Garcia, J ;
delMoral, A ;
Arnold, Z .
NATURE, 1997, 386 (6622) :256-259
[9]   Transport properties of L(1-x)Sr(x)MnO(3) (L=Pr, Nd; 1/4<=x<=1/2) [J].
Fisher, B ;
Patlagan, L ;
Reisner, GM .
PHYSICAL REVIEW B, 1996, 54 (13) :9359-9364
[10]  
GHANASHYAM M, 1998, THIN SOLID FILMS, V312, P116