Orbital domain state and finite size scaling in ferromagnetic insulating manganites

被引：53

作者：

Papavassiliou, G ^{[1
]}

Pissas, M

Belesi, M

Fardis, M

Dolinsek, J

Dimitropoulos, C

Ansermet, JP

机构：

[1] NCSR Demokritos, Inst Mat Sci, Athens 15310, Greece

[2] Josef Stefan Inst, Ljubljana 61111, Slovenia

[3] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[4] Ecole Polytech Fed Lausanne, PH Ecublens, Inst Phys Expt, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.91.147205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Mn-55 and La-139 NMR measurements on a high quality single crystal of ferromagnetic (FM) La0.80Ca0.20MnO3 demonstrate the formation of localized Mn-3+,Mn-4+ states below 70 K, accompanied by a strong cooling-rate dependent increase of certain FM neutron Bragg peaks. (55,139)(1/T-1) spin-lattice and (139)(1/T-2) spin-spin relaxation rates are strongly enhanced on approaching this temperature from below, signaling a genuine phase transition at T(tr)similar or equal to70 K. The disappearance of the FM metallic signal by applying a weak external magnetic field, the different NMR radio-frequency enhancement of the FM metallic and insulating states, and the observed finite size scaling of T-tr with Ca (hole) doping, as observed in powder La1-xCaxMnO3 samples, are suggestive of freezing into an inhomogeneous FM insulating and orbitally ordered state embodying "metallic" hole-rich walls.

引用

页数：4

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