Impact of local lattice disorder on spin and orbital orders in Ca 2-xSrxRuO4

Takuya Sugimoto; Daiki Ootsuki; Takashi Mizokawa

doi:10.7566/JPSJ.82.104714

Impact of local lattice disorder on spin and orbital orders in Ca _2-xSrxRuO₄

Takuya Sugimoto, Daiki Ootsuki, Takashi Mizokawa

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

We have studied relationship between local lattice disorder, Ru 4d spin-orbit interaction, and global spin/orbital orders of Ca _2-xSrxRuO4 in the Sr- and Ca-rich regions of its phase diagram by using unrestricted Hartree-Fock calculation on a 8 × 8 RuO₄ lattice model. The calculations show that the local elongation of RuO ₆ octahedron in an antiferromagnetic insulator Ca₂RuO ₄ induces local orbital change with making the Mott gap narrower. On the other hand, local compression of RuO₆ octahedron in a paramagnetic metal Sr₂RuO₄ induces global antiferromagnetic or ferromagnetic states. This result is consistent with a recent systematic μSR study by Carlo et al. which has revealed the static antiferromagnetic order at low temperature in the Sr-rich region.

Original language	English
Article number	104714
Journal	journal of the physical society of japan
Volume	82
Issue number	10
DOIs	https://doi.org/10.7566/JPSJ.82.104714
Publication status	Published - 2013 Oct
Externally published	Yes

Keywords

Antiferromagnetism
Layered ruthenates
Mott insulator
Orbital degeneracy

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.7566/JPSJ.82.104714

Cite this

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title = "Impact of local lattice disorder on spin and orbital orders in Ca 2-xSrxRuO4",

abstract = "We have studied relationship between local lattice disorder, Ru 4d spin-orbit interaction, and global spin/orbital orders of Ca 2-xSrxRuO4 in the Sr- and Ca-rich regions of its phase diagram by using unrestricted Hartree-Fock calculation on a 8 × 8 RuO4 lattice model. The calculations show that the local elongation of RuO 6 octahedron in an antiferromagnetic insulator Ca2RuO 4 induces local orbital change with making the Mott gap narrower. On the other hand, local compression of RuO6 octahedron in a paramagnetic metal Sr2RuO4 induces global antiferromagnetic or ferromagnetic states. This result is consistent with a recent systematic μSR study by Carlo et al. which has revealed the static antiferromagnetic order at low temperature in the Sr-rich region.",

keywords = "Antiferromagnetism, Layered ruthenates, Mott insulator, Orbital degeneracy",

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T1 - Impact of local lattice disorder on spin and orbital orders in Ca 2-xSrxRuO4

AU - Sugimoto, Takuya

AU - Ootsuki, Daiki

AU - Mizokawa, Takashi

PY - 2013/10

Y1 - 2013/10

N2 - We have studied relationship between local lattice disorder, Ru 4d spin-orbit interaction, and global spin/orbital orders of Ca 2-xSrxRuO4 in the Sr- and Ca-rich regions of its phase diagram by using unrestricted Hartree-Fock calculation on a 8 × 8 RuO4 lattice model. The calculations show that the local elongation of RuO 6 octahedron in an antiferromagnetic insulator Ca2RuO 4 induces local orbital change with making the Mott gap narrower. On the other hand, local compression of RuO6 octahedron in a paramagnetic metal Sr2RuO4 induces global antiferromagnetic or ferromagnetic states. This result is consistent with a recent systematic μSR study by Carlo et al. which has revealed the static antiferromagnetic order at low temperature in the Sr-rich region.

AB - We have studied relationship between local lattice disorder, Ru 4d spin-orbit interaction, and global spin/orbital orders of Ca 2-xSrxRuO4 in the Sr- and Ca-rich regions of its phase diagram by using unrestricted Hartree-Fock calculation on a 8 × 8 RuO4 lattice model. The calculations show that the local elongation of RuO 6 octahedron in an antiferromagnetic insulator Ca2RuO 4 induces local orbital change with making the Mott gap narrower. On the other hand, local compression of RuO6 octahedron in a paramagnetic metal Sr2RuO4 induces global antiferromagnetic or ferromagnetic states. This result is consistent with a recent systematic μSR study by Carlo et al. which has revealed the static antiferromagnetic order at low temperature in the Sr-rich region.

KW - Antiferromagnetism

KW - Layered ruthenates

KW - Mott insulator

KW - Orbital degeneracy

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