NMR evidence for Mott-Hubbard localization in (NH3)K3C60

被引：40

作者：

Tou, H

Maniwa, Y

Iwasa, Y

Shimoda, H

Mitani, T

机构：

[1] Tokyo Metropolitan Univ, Dept Phys, Hachioji, Tokyo 1920397, Japan

[2] Japan Adv Inst Sci & Technol, Tatsunokuchi, Ishikawa 9231292, Japan

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.62.R775

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

C-13, H-1, and K-39-NMR measurements of (NH3)K3C60 unambiguously demonstrated that its magnetic properties are described as a S = 1/2 localized spin system over the entire temperature range (300 K-4.2 K). A possible antiferromagnetic structure that appeared below 45 K is compatible with the orientational order of KNH3 pairs on the octahedral (O) site. The present NMR study strongly suggests that the Mott-Hubbard localization occurs due to the removal of the C-60 t(1u)-orbital degeneracy.

引用

收藏

页码：R775 / R778

页数：4

相关论文

共 26 条

[1] Metal-insulator transition and molecular dynamics in (NH3)K3C60 [J].

Allen, KM ;

Hayes, SJ ;

Rosseinsky, MJ .

JOURNAL OF MATERIALS CHEMISTRY, 1996, 6 (08) :1445-1447

[2] NMR evidence for 1D antiferromagnetic properties in Cs1C60 and Rb1C60 polymers [J].

Brouet, V ;

Alloul, H ;

Yoshinari, Y ;

Forro, L .

PHYSICAL REVIEW LETTERS, 1996, 76 (19) :3638-3641

[3]

Dresselhaus M. S., 1996, SCI FULLERENES CARBO

[4] Superconductivity in fullerides [J].

Gunnarsson, O .

REVIEWS OF MODERN PHYSICS, 1997, 69 (02) :575-606

[5] Structural phase transition in the ammoniated alkali C60 compound (NH3)K3C60 [J].

Ishii, K ;

Watanuki, T ;

Fujiwara, A ;

Suematsu, H ;

Iwasa, Y ;

Shimoda, H ;

Mitani, T ;

Nakao, H ;

Fujii, Y ;

Murakami, Y ;

Kawada, H .

PHYSICAL REVIEW B, 1999, 59 (06) :3956-3960

[6] Metal-insulator transition in ammoniated K3C60 [J].

Iwasa, Y ;

Shimoda, H ;

Palstra, TTM ;

Maniwa, Y ;

Zhou, O ;

Mitani, T .

PHYSICAL REVIEW B, 1996, 53 (14) :R8836-R8839

[7] Antiferromagnetic resonance in the linear chain conducting polymers RbC60 and CsC60 [J].

Janossy, A ;

Nemes, N ;

Feher, T ;

Oszlanyi, G ;

Baumgartner, G ;

Forro, L .

PHYSICAL REVIEW LETTERS, 1997, 79 (14) :2718-2721

[8] METAL-INSULATOR TRANSITIONS IN DEGENERATE HUBBARD MODELS AND AXC60 [J].

LU, JP .

PHYSICAL REVIEW B, 1994, 49 (08) :5687-5690

[9] NMR studies of ammoniated NaA2C60 superconductors [J].

Maniwa, Y ;

Muroga, N ;

Tou, H ;

Kikuchi, K ;

Suzuki, S ;

Achiba, Y ;

Kosaka, M ;

Tanigaki, K ;

Iwasa, Y ;

Shimoda, H ;

Mitani, T .

SYNTHETIC METALS, 1999, 103 (1-3) :2458-2461

[10] Determination of C-13 NMR isotropic Knight shift and deviation from BCS relation in A(3)C(60) superconductors [J].

Maniwa, Y ;

Sugiura, D ;

Kume, K ;

Kikuchi, K ;

Suzuki, S ;

Achiba, Y ;

Hirosawa, I ;

Tanigaki, K ;

Shimoda, H ;

Iwasa, Y .

PHYSICAL REVIEW B, 1996, 54 (10) :R6861-R6864