Collective orbital excitations in orbitally ordered YVO3 and HoVO3

被引：25

作者：

Benckiser, E. ^{[1
]}

Rueckamp, R. ^{[2
]}

Moeller, T. ^{[1
]}

Taetz, T. ^{[3
]}

Moeller, A. ^{[3
]}

Nugroho, A. A. ^{[4
,5
]}

Palstra, T. T. M. ^{[5
]}

Uhrig, G. S. ^{[6
]}

Grueninger, M. ^{[1
]}

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[2] Rhein Westfal TH Aachen Univ, Phys Inst A 2, D-52056 Aachen, Germany

[3] Univ Cologne, Inst Anorgan Chem, D-50939 Cologne, Germany

[4] Inst Teknol Bandung, Bandung 40132, Indonesia

[5] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands

[6] Tech Univ Dortmund, D-44221 Dortmund, Germany

来源：

NEW JOURNAL OF PHYSICS | 2008年 / 10卷

关键词：

D O I：

10.1088/1367-2630/10/5/053027

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study orbital excitations in the optical absorption spectra of YVO3 and HoVO3. We focus on an orbital absorption band observed at 0.4 eV for polarization E parallel to c. This feature is only observed in the intermediate, monoclinic phase. By comparison with the local crystal-field (CF) excitations in VOCl and with recent theoretical predictions for the CF levels we show that this absorption band cannot be interpreted in terms of a local CF excitation. We discuss a microscopic model which attributes this absorption band to the exchange of two orbitals on adjacent sites, i.e. to the direct excitation of two orbitons. This model is strongly supported by the observed dependence on polarization and temperature. Moreover, the calculated spectral weight is in good agreement with the experimental result.

引用

页数：21

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