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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2012, Volume 96, Issue 6, Pages 424–429
(Mi jetpl3233)
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This article is cited in 23 scientific papers (total in 23 papers)
CONDENSED MATTER
Pseudogap phase in cuprates: oxygen orbital moments instead of circulating currentss
A. S. Moskvin Ural State University, Ekaterinburg
Abstract:
Circulating current (CC) loops within the cuprate unit cell are
proposed to play a key role in the physics of the pseudogap phase. However,
main experimental observations motivated by this sophisticated proposal and
seemingly supporting the CC model can be explained in frames of a simple and
physically clear microscopic model. We argue that instead of a well-isolated
Zhang–Rice (ZR) singlet $^1A_{1g}$ the ground state of the hole center
[CuO$_4$]$^{5-}$ (cluster analog of Cu$^{3+}$ ion) in cuprates should be
described by a complex $^1A_{1g}$-$^{1,3}B_{2g}$-$^{1,3}E_u$ multiplet,
formed by a competition of conventional hybrid Cu $3d$-O $2p$
$b_{1g}(\sigma)\propto d_{x^2 -y^2}$ state and purely oxygen nonbonding
O $2p\pi$ states with $a_{2g}(\pi)$ and $e_{ux,y}(\pi)$ symmetry. In contrast
with inactive ZR singlet we arrive at several novel competing orbital and
spin-orbital order parameters, e.g., Ising-like net orbital magnetic moment,
orbital toroidal moment, intra-plaquette's staggered order of Ising-like
oxygen orbital magnetic moments. As a most impressive validation of the
non-ZR model we explain fascinating results of recent neutron scattering
measurements that revealed novel type of magnetic ordering in pseudogap phase
of several hole-doped cuprates.
Received: 03.08.2012
Citation:
A. S. Moskvin, “Pseudogap phase in cuprates: oxygen orbital moments instead of circulating currentss”, Pis'ma v Zh. Èksper. Teoret. Fiz., 96:6 (2012), 424–429; JETP Letters, 96:6 (2012), 385–390
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https://www.mathnet.ru/eng/jetpl3233 https://www.mathnet.ru/eng/jetpl/v96/i6/p424
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Abstract page: | 183 | Full-text PDF : | 51 | References: | 36 | First page: | 13 |
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