Ground State in a Half-Doped Manganite Distinguished by Neutron Spectroscopy

被引：14

作者：

Johnstone, G. E. ^{[1
]}

Perring, T. G. ^{[2
,3
]}

Sikora, O. ^{[4
]}

Prabhakaran, D. ^{[1
]}

Boothroyd, A. T. ^{[1
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[2] STFC Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[3] UCL, London Ctr Nanotechnol, London WC1H 0AH, England

[4] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 23期

基金：

英国工程与自然科学研究理事会;

关键词：

CHARGE; DIFFRACTION;

D O I：

10.1103/PhysRevLett.109.237202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured the spin-wave spectrum of the half-doped bilayer manganite Pr(Ca, Sr)(2)Mn2O7 in its spin, charge, and orbital ordered phase. The measurements, which extend throughout the Brillouin zone and cover the entire one-magnon spectrum, are compared critically with spin-wave calculations for different models of the electronic ground state. The data are described very well by the Goodenough model, which has weakly interacting ferromagnetic zig-zag chains in the CE-type arrangement. A model that allows ferromagnetic dimers to form within the zigzags is inconsistent with the data. The analysis conclusively rules out the strongly bound dimer (Zener polaron) model. DOI: 10.1103/PhysRevLett.109.237202

引用

页数：5

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