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spin state transition
相关语句
  自旋态转变
     The origin of CMR and the effect of Fe doping in La0.67Sr0.33CoO3 are interpreted in terms of the spin- state transition induced by applied magnetic fields.
     La0.67Sr0.33CoO3的 Fe掺杂效应和磁电阻的起源可由外加磁场导致的自旋态转变来解释。
短句来源
  相似匹配句对
     ON THE ELECTRONIC SPIN
     关于电子自旋两则
短句来源
     The Power of Spin
     旋转的力量
短句来源
     Study on High Spin States
     ~(85)Zr核的高自旋态研究
短句来源
     NUCLEAR HIGH-SPIN STATES
     原子核的高自旋态
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     Employment in Transition
     变革中的劳动就业
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The influence of Fe doping at Co-site on the electrical transport behavior and the colossal magnetoresistance of La0.67Sr0.33Co(1-x)FexO3 were investigated. The results show that the electrical resistivity of La0.67Sr0.33Co(1-x)FexO3 exhibits metal behavior in low-doped (a<0.1) samples and semiconducting behavior in high-doped (x=0.2 and 0.3) samples. Fe doping weakens the MR peak near Tc but enhances the low-temperature MR. The origin of CMR in La0.67Sr0.33Co(1-x)FexO3 system can be interpreted in terms of...

The influence of Fe doping at Co-site on the electrical transport behavior and the colossal magnetoresistance of La0.67Sr0.33Co(1-x)FexO3 were investigated. The results show that the electrical resistivity of La0.67Sr0.33Co(1-x)FexO3 exhibits metal behavior in low-doped (a<0.1) samples and semiconducting behavior in high-doped (x=0.2 and 0.3) samples. Fe doping weakens the MR peak near Tc but enhances the low-temperature MR. The origin of CMR in La0.67Sr0.33Co(1-x)FexO3 system can be interpreted in terms of the spin-state transition induced by applying magnetic field.

研究了Co位Fe掺杂对La_(0.67)Sr_(0.33)Co_(1-x)Fe_xO_3体系的电输运性质和超大磁阻效应的影响。实验结果表明:在低掺杂(x<0.1)时电阻率表现出金属性输运行为,在高掺杂(x=0.2和0.3)时则为半导体行为。Fe掺杂削弱了T_c处的MR峰值,但增加了低温下(T <

Temperature dependence of longitudinal and transverse ultrasonic velocities and attenuations of the single-phase polycrystalline LaCoO-3 were presented. A clear softening in the longitudinal ultrasonic velocity accompanied by a sharp peak in attenuation were observed near the spin-state transition temperature(≈90K), which did not appear in the transverse mode measurement. This anomalous ultrasonic behavior further demonstrates that the spin-state transition of Co 3+ ions in...

Temperature dependence of longitudinal and transverse ultrasonic velocities and attenuations of the single-phase polycrystalline LaCoO-3 were presented. A clear softening in the longitudinal ultrasonic velocity accompanied by a sharp peak in attenuation were observed near the spin-state transition temperature(≈90K), which did not appear in the transverse mode measurement. This anomalous ultrasonic behavior further demonstrates that the spin-state transition of Co 3+ ions in LaCoO-3 near 90K are more likely from a low spin state (LS,t6- 2g e0-g) to an intermediate spin state (IS,t5- 2g e1-g ) than to a high spin state (HS, t4- 2g e2-g ). A big attenuation peak accompanied by a slight softening in velocity was observed near 200K in both longitudinal and transverse modes, which was probably caused by the relaxation of the local distortions originating from Jahn-Teller effect of the randomly distributed IS state Co 3+ ions.

测量了LaCoO3单相多晶样品的纵波与横波超声声速和衰减随温度的变化关系,在材料的自旋态转变温度附近(≈90K),纵波声速出现明显的软化并伴随一个尖锐的衰减峰,但是在横波的测量中却没有出现类似的超声异常,分析认为LaCoO3在90K附近的自旋态转变是由于Co3+离子是从低自旋态(LS,t62ge0g)转变到中等自旋态(IS,t52ge1g),而不是高等自旋态(HS,t42ge2g).随着温度的升高,在200K附近纵波和横波测量上都观察到一个伴随着微小声速软化的宽大的衰减峰,这可能是随机分布的IS态Co3+离子的JahnTeller效应导致的局域晶格扭曲所造成的.

M~T curves and M~H curves of the systems La_0.67Sr_0.33CoO_3, La_0.67Sr_0.33MnO_3 (x=0.00, 0.05, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.67) were studied by experiments. Experimental results show that the magnetic structure of La_0.67-xGd_xSr_0.33CoO_3 system exhibits the cluster glass state with doping Gd increasing. The M~T curves of samples x>0.10 exhibit a peculiar phenomenon that M value rises sharply at low temperature range. The magnetic structure of La_0.67-xGd_xSr_0.33MnO_3 system changes from the long-rang...

M~T curves and M~H curves of the systems La_0.67Sr_0.33CoO_3, La_0.67Sr_0.33MnO_3 (x=0.00, 0.05, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.67) were studied by experiments. Experimental results show that the magnetic structure of La_0.67-xGd_xSr_0.33CoO_3 system exhibits the cluster glass state with doping Gd increasing. The M~T curves of samples x>0.10 exhibit a peculiar phenomenon that M value rises sharply at low temperature range. The magnetic structure of La_0.67-xGd_xSr_0.33MnO_3 system changes from the long-rang ferromagnetic order to the cluster glass state, and anti-ferromagnetic state. The M~T curves of samples x≥0.50 decline sharply at low temperature range. The different phenomena shown by the two systems come from different coupling function between Gd and Co, Mn and from spin state transition of Co.

通过实验研究了La0.67-xGdxSr0.33CoO3、La0.67-xGdxSr0.33MnO3(x=0.00、0.05、0.10、0.20、0.30、0.40、0.50、0.60、0.67)体系的磁化强度与温度的关系(M~T)曲线、磁化强度与磁场强度的关系(M~H)曲线.实验结果表明,随Gd掺杂浓度增高,La0.67-xGdxSr0.33CoO3体系的磁结构表现为团簇玻璃态,x>0.10样品的M~T曲线出现了低温区M值急剧上升的奇特现象;La0.67-xGdxSr0.33MnO3体系的磁结构从长程铁磁有序向团簇玻璃态、反铁磁状态转变,x≥0.50样品的M~T曲线在低温区急剧下降.两种体系呈现的不同现象,来源于Gd与Co、Mn不同的耦合作用和Co的自旋态的转变.

 
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