Spin-cluster effect and lattice-deformation-induced Kondo effect, spin-glass freezing, and strong phonon scattering in La0.7Ca0.3Mn1−xCrxO3

Besides the Kondo effect observed in dilute magnetic alloys, the Cr-doped perovskite manganate compounds La0.7Ca0.3Mn1−xCrxO3 also exhibit Kondo effect and spin-glass freezing in a certain composition range. An extensive investigation for the La0.7Ca0.3Mn1−xCrxO3 (x=0.01, 0.05, 0.10, 0.3, 0.6, and 1.0) system on the magnetization and ac susceptibility, the resistivity and magnetoresistance, as well as the thermal conductivity is done at low temperature. The spin-glass behavior has been confirmed for these compounds with x=0.05, 0.1, and 0.3. For temperatures above Tf (the spin-glass freezing temperature) a Curie–Weiss law is obeyed. The paramagnetic Curie temperature θ is dependent on Cr doping. Below Tf there exists a Kondo minimum in the resistivity. Colossal magnetoresistance has been observed in this system with Cr concentration up to x=0.6. We suppose that the substitution of Mn with Cr dilutes Mn ions and changes the long-range ferromagnetic order of La0.7Ca0.3MnO3. These behaviors demonstrate that ...

[1]  Estimation of the charge carrier localization length from Gaussian fluctuations in the magneto-thermopower of La0.6Y0.1Ca0.3MnO3 , 1999 .

[2]  B. Raveau,et al.  Colossal magnetoresistance, charge ordering and related properties of manganese oxides , 1998 .

[3]  Hwang,et al.  Lattice effects on the magnetoresistance in doped LaMnO3. , 1995, Physical review letters.

[4]  H. Song,et al.  Magnetic and electronic properties of transition-metal-substituted perovskite manganites—La0.7Ca0.3Mn0.95X0.05O3 (X=Fe,Co,Ni) , 2001 .

[5]  Y. Moritomo,et al.  ELECTRONIC PHASE DIAGRAM AND PHASE SEPARATION IN CR-DOPED MANGANITES , 1999 .

[6]  Clarence Zener,et al.  Interaction between the d -Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite Structure , 1951 .

[7]  A. P. Ramirez,et al.  Thermal Conductivity of Manganite Perovskites: Colossal Magnetoresistance as a Lattice-Dynamics Transition , 1997 .

[8]  O. Cabeza,et al.  Magnetic and electrical properties of Cr-doped La0.7Ca0.3MnO3 , 1999 .

[9]  A. Tulapurkar,et al.  Structural, magnetic and magnetotransport properties of the La0.67Ca0.33Mn0.9Fe0.1O3 perovskite , 2003 .

[10]  M. Ausloos,et al.  Spin Glass Behaviour and Spin-Dependent Scattering in La0.7Ca0.3Mn0.9Cr0.1O3 Perovskites , 2005 .

[11]  J. M. D. Coey,et al.  Mixed-valence manganites , 1999 .

[12]  J. Yakhmi,et al.  Magnetic and electrical properties of La0.67Ca0.33MnO3 as influenced by substitution of Cr , 2000 .

[13]  B. Shen,et al.  Colossal magnetoresistance in cluster glass-like insulator La0.67Sr0.33(Mn0.8Ni0.2)O3 , 1999 .

[14]  S. K. Tiwary,et al.  Electrical transport, magnetism, and magnetoresistance in ferromagnetic oxides with mixed exchange interactions: A study of the La 0.7 Ca 0.3 Mn 1 − x Co x O 3 system , 1997 .

[15]  S. Mangin,et al.  Influence of the cooperative Jahn-Teller effect on the transport- and magnetic properties of La 7/8 Sr 1/8 MnO 3 single crystals , 1999, cond-mat/9908374.

[16]  Bishop,et al.  Lattice effects in the colossal-magnetoresistance manganites. , 1996, Physical review letters.

[17]  S. Ogale,et al.  Transition-element doping effects in La 0.7 Ca 0.3 MnO 3 , 1999 .

[18]  J. Mydosh,et al.  High-temperature susceptibility of theCuMnspin-glass , 1981 .

[19]  J. Kondo.  Resistance Minimum in Dilute Magnetic Alloys , 1964 .

[20]  Schultz,et al.  Giant negative magnetoresistance in perovskitelike La2/3Ba1/3MnOx ferromagnetic films. , 1993, Physical review letters.

[21]  A P Ramirez.  REVIEW ARTICLE: Colossal magnetoresistance , 1997 .

[22]  T. Tiefel,et al.  Thousandfold Change in Resistivity in Magnetoresistive La-Ca-Mn-O Films , 1994, Science.

[23]  Gonzalo Alvarez,et al.  Nanoscale phase separation and colossal magnetoresistance : the physics of manganites and related compounds , 2003 .

[24]  Masahiro Kasai,et al.  31p-S-4 Giant Magnetoresistance in Magnetic Manganese Oxide with Intrinsic Antiferromagnetic Spin Structure , 1993 .

[25]  J. Goodenough,et al.  Phonon-assisted double exchange in perovskite manganites , 1998 .

[26]  C. Greaves,et al.  Magnetization and resistivity in chromium doped manganites , 1999 .

[27]  H. Fujishiro,et al.  Two-level-like anomalous phonon scattering in La2−xSrxCuO4 and La1−xSrxMnO3 , 1999 .

[28]  S. Cheong,et al.  Phonon thermal conductivity and stripe correlations in La 2-x Sr x NiO 4 and Sr 1.5 La 0.5 MnO 4 , 1999 .

[29]  K. Suzuki.  Magnetic, electrical and thermal properties of La0.80Sr0.20(MnyCo1$minus;y)O3 , 2003 .

[30]  J. Rivas,et al.  Effect of Mn-site doping on the magnetotransport properties of the colossal magnetoresistance compound La 2/3 Ca 1/3 Mn 1-x A x O 3 (A=Co,Cr; x<=0.1) , 2000 .

[31]  A. Millis.  Lattice effects in magnetoresistive manganese perovskites , 1998, Nature.

[32]  Magnon-polaron and spin-polaron signatures in the specific heat and electrical resistivity of La0.6Y0.1Ca0.3MnO3 in zero magnetic field and the effect of Mn - O - Mn bond environment , 2002, cond-mat/0209340.

[33]  H. Fujishiro,et al.  Thermal conductivity of Pr0.65(Ca1$minus;ZSrZ)0.35MnO3 under applied field , 2003 .