Magnetoresistance and magnetothermoelectric power of La0.5Pb0.5Mn1-xCrxO3 -: art. no. 104428

被引:72
作者
Banerjee, A
Pal, S
Bhattacharya, S
Chaudhuri, BK [1 ]
Yang, HD
机构
[1] Indian Assoc Cultivat Sci, Dept Solid State Phys, Jadavpur 700032, Kolkata, India
[2] Natl Sun Yat Sen Univ, Dept Phys, Kaohsiung 804, Taiwan
关键词
D O I
10.1103/PhysRevB.64.104428
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report the results of thermoelectric power (TEP) of a Cr doped La0.5Pb0.5Mn1-xCrxO3 (x=0-0.45) system measured both in the presence and the absence of magnetic field (B=1.5 T). The small field dependence of the Seebeck coefficient is observed around the metal-semiconductor transition (MST) temperature (T-p) of the samples. The field dependence of TEP is stronger in the undoped sample. It is noticed from the TEP data that the small polaron hopping conduction mechanism is valid for all these samples (for T>T-p). The polaron radius r(p) is found to decrease with increase of magnetic field. Low-temperature (below T-p) field-dependent and field-independent TEP data can be fitted with S=S-0+S3/2T3/2+S4T4 suggesting that the electron-magnon scattering strongly affects the low-temperature (ferromagnetic phase) TEP data of the manganites. Activation energy gradually increases with increasing Cr concentration both in the presence and the absence of magnetic field. Field-dependent thermopower also indicates the importance of spin fluctuations affecting the phonon scattering, Power factor (S-2/rho) estimated from the Seebeck coefficient (S) And resistivity (rho) (at zero and 1.5 T field) showed a minimum around the MST temperature similar to the field-dependent thermal conductivity data.
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页数:7
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共 35 条
[1]   Thermoelectric effect in La1-xSrxMnO3 [J].
Asamitsu, A ;
Moritomo, Y ;
Tokura, Y .
PHYSICAL REVIEW B, 1996, 53 (06) :R2952-R2955
[2]   Nature of small-polaron hopping conduction and the effect of Cr doping on the transport properties of rare-earth manganite La0.5Pb0.5Mn1-xCrxO3 [J].
Banerjee, A ;
Pal, S ;
Chaudhuri, BK .
JOURNAL OF CHEMICAL PHYSICS, 2001, 115 (03) :1550-1558
[3]   Extension of colossal magnetoresistance properties to small A site cations by chromium doping in Ln0.5Ca0.5MnO3 manganites [J].
Barnabe, A ;
Maignan, A ;
Hervieu, M ;
Damay, F ;
Martin, C ;
Raveau, B .
APPLIED PHYSICS LETTERS, 1997, 71 (26) :3907-3909
[4]   Structural, magnetic, and transport properties of the giant magnetoresistive perovskites La2/3Ca1/3Mn1-xAlxO3-delta [J].
Blasco, J ;
Garcia, J ;
deTeresa, JM ;
Ibarra, MR ;
Perez, J ;
Algarabel, PA ;
Marquina, C ;
Ritter, C .
PHYSICAL REVIEW B, 1997, 55 (14) :8905-8910
[5]   Magnetization and resistivity in chromium doped manganites [J].
Cabeza, O ;
Long, M ;
Severac, C ;
Bari, MA ;
Muirhead, CM ;
Francesconi, MG ;
Greaves, C .
JOURNAL OF PHYSICS-CONDENSED MATTER, 1999, 11 (12) :2569-2578
[6]   Lattice effects on the transport properties of (R,Sr)3Mn2O7 (R = La, Eu, and Pr) [J].
Chatterjee, S ;
Chou, PH ;
Chang, CF ;
Hong, IP ;
Yang, HD .
PHYSICAL REVIEW B, 2000, 61 (09) :6106-6113
[7]   Magnetothermal conductivity of La0.8Ca0.2MnO3 [J].
Chen, BX ;
Rojo, AG ;
Uher, C ;
Ju, HL ;
Greene, RL .
PHYSICAL REVIEW B, 1997, 55 (23) :15471-15474
[8]   Spontaneous behavior and magnetic field and pressure effects on La2/3Ca1/3MnO3 perovskite [J].
DeTeresa, JM ;
Ibarra, MR ;
Blasco, J ;
Garcia, J ;
Marquina, C ;
Algarabel, PA ;
Arnold, Z ;
Kamenev, K ;
Ritter, C ;
vonHelmolt, R .
PHYSICAL REVIEW B, 1996, 54 (02) :1187-1193
[9]   Transition-element doping effects in La0.7Ca0.3MnO3 [J].
Ghosh, K ;
Ogale, SB ;
Ramesh, R ;
Greene, RL ;
Venkatesan, T ;
Gapchup, KM ;
Bathe, R ;
Patil, SI .
PHYSICAL REVIEW B, 1999, 59 (01) :533-537
[10]   Structural, magnetic and magnetotransport properties of La0.7Pb0.3Mn0.9TM0.1O3 (TM = Fe, Co, Ni) CMR perovskites [J].
Gutiérrez, J ;
Peña, A ;
Barandiarán, JM ;
Pizarro, JL ;
Lezama, L ;
Insausti, M ;
Rojo, T .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2000, 12 (50) :10523-10534