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Volumn 78, Issue 18, 2008, Pages

Doping-dependent charge and spin superstructures in layered cobalt perovskites

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EID: 56349162698     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.78.180406     Document Type: Article
Times cited : (21)

References (28)
  • 9
  • 10
    • 0027592522 scopus 로고
    • 10.1016/0921-4534(93)90581-A
    • V. J. Emery and S. A. Kivelson, Physica C 209, 597 (1993). 10.1016/0921-4534(93)90581-A
    • (1993) Physica C , vol.209 , pp. 597
    • Emery, V.J.1    Kivelson, S.A.2
  • 20
    • 56349115407 scopus 로고    scopus 로고
    • Magnetic Co2+ are in 3 d7 (t 2g 5 eg2) state and, like Cu2+, are Kramer's ions, albeit with spin S=3/2. Hund's coupling in cobaltites is in close competition with crystal field (CF), so doped holes can yield Co3+ (3 d6) in an intermediate (IS, S=1) or low spin (LS, S=0) state (Refs.). Magnetic susceptibility data of Ref. indicate change to a lower-spin Co3+ state with doping at x∼0.7. In either case the ground state in the crystal field is Sz =0 singlet and is effectively nonmagnetic at low T (Ref.). This is a fundamental consequence of Kramers time-reversal symmetry and makes comparison with cuprates particularly meaningful: Hund's rule is not at play for a single hole in 3 d9 Cu2+, while covalency and strong correlation yield a non-Hund S=0 singlet 3 d8 state for doped holes.
    • Magnetic Co2+ are in 3 d7 (t 2g 5 eg2) state and, like Cu2+, are Kramer's ions, albeit with spin S=3/2. Hund's coupling in cobaltites is in close competition with crystal field (CF), so doped holes can yield Co3+ (3 d6) in an intermediate (IS, S=1) or low spin (LS, S=0) state (Refs.). Magnetic susceptibility data of Ref. indicate change to a lower-spin Co3+ state with doping at x∼0.7. In either case the ground state in the crystal field is Sz =0 singlet and is effectively nonmagnetic at low T (Ref.). This is a fundamental consequence of Kramers time-reversal symmetry and makes comparison with cuprates particularly meaningful: Hund's rule is not at play for a single hole in 3 d9 Cu2+, while covalency and strong correlation yield a non-Hund S=0 singlet 3 d8 state for doped holes.
  • 26
    • 0038778489 scopus 로고    scopus 로고
    • 10.1103/PhysRevB.67.134401;
    • D. I. Khomskii and K. I. Kugel, Phys. Rev. B 67, 134401 (2003) 10.1103/PhysRevB.67.134401
    • (2003) Phys. Rev. B , vol.67 , pp. 134401
    • Khomskii, D.I.1    Kugel, K.I.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.