Optical Evidence for Symmetry Changes above the Neel Temperature of KCuF3

被引：45

作者：

Deisenhofer, J. ^{[1
]}

Leonov, I. ^{[2
]}

Eremin, M. V. ^{[3
]}

Kant, Ch. ^{[4
]}

Ghigna, P. ^{[5
]}

Mayr, F. ^{[4
]}

Iglamov, V. V. ^{[3
]}

Anisimov, V. I. ^{[6
]}

van der Marel, D. ^{[1
]}

机构：

[1] Univ Geneva, Dept Phys Matiere Condensee, CH-1211 Geneva 4, Switzerland

[2] Abdus Salam Int Ctr Theoret Phys, I-34014 Trieste, Italy

[3] Kazan VI Lenin State Univ, Kazan 420008, Russia

[4] Univ Augsburg, Inst Phys, EKM, EP 5, D-86135 Augsburg, Germany

[5] Univ Pavia, Dipartimento Chim Fis M Rolla, I-27100 Pavia, Italy

[6] Inst Met Phys, Ekaterinburg 620219, Russia

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.101.157406

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on optical measurements of the 1D Heisenberg antiferromagnet KCuF(3). The crystal-field excitations of the Cu(2+) ions have been observed and their temperature dependence can be understood in terms of magnetic and exchange-induced dipole mechanisms and vibronic interactions. Above T(N) we observe a new temperature scale T(S) characterized by the emergence of narrow absorption features that correlate with changes of the orbital ordering as observed by Paolasini et al. [Phys. Rev. Lett. 88, 106403 (2002)]. The appearance of these optical transitions provides evidence for a symmetry change above the Neel temperature that affects the orbital ordering and paves the way for the antiferromagnetic ordering.

引用

页数：4

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