Broken parity and a chiral ground state in the frustrated magnet CdCr2O4

被引：45

作者：

Chern, Gia-Wei ^{[1
]}

Fennie, C. J.

Tchernyshyov, O.

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 06期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.74.060405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a model describing the lattice distortion and incommensurate magnetic order in the spinel CdCr2O4, a good realization of the Heisenberg "pyrochlore" antiferromagnet. The magnetic frustration is relieved through the spin-Peierls distortion of the lattice involving a phonon doublet with odd parity. The distortion stabilizes a collinear magnetic order with the propagation wave vector q=2 pi(0,0,1). The lack of inversion symmetry makes the crystal structure chiral. The handedness is transferred to magnetic order by the relativistic spin-orbit coupling: the collinear state is twisted into a long spiral with the spins in the ac plane and q shifted to 2 pi(0,delta,1).

引用

页数：4

共 25 条

[1] First-principles calculations of the electronic structure and spectra of strongly correlated systems: The LDA+U method [J].

Anisimov, VI ;

Aryasetiawan, F ;

Lichtenstein, AI .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1997, 9 (04) :767-808

[2] PROJECTOR AUGMENTED-WAVE METHOD [J].

BLOCHL, PE .

PHYSICAL REVIEW B, 1994, 50 (24) :17953-17979

[3]

BROHOLM C, COMMUNICATION

[4]

CHERN G, UNPUB

[5] Statics and dynamics of incommensurate spin order in a geometrically frustrated antiferromagnet CdCr2O4 -: art. no. 247204 [J].

Chung, JH ;

Matsuda, M ;

Lee, SH ;

Kakurai, K ;

Ueda, H ;

Sato, TJ ;

Takagi, H ;

Hong, KP ;

Park, S .

PHYSICAL REVIEW LETTERS, 2005, 95 (24)

[6]

DZYALOSHINSKII IE, 1964, SOV PHYS JETP-USSR, V19, P960

[7] Ordering in the pyrochlore antiferromagnet due to Dzyaloshinsky-Moriya interactions [J].

Elhajal, M ;

Canals, B ;

Sunyer, R ;

Lacroix, C .

PHYSICAL REVIEW B, 2005, 71 (09)

[8] Polar phonons and intrinsic dielectric response of the ferromagnetic insulating spinel CdCr2S4 from first principles -: art. no. 214123 [J].

Fennie, CJ ;

Rabe, KM .

PHYSICAL REVIEW B, 2005, 72 (21)

[9] Magnetically induced phonon anisotropy in ZnCr2O4 from first principles [J].

Fennie, Craig J. ;

Rabe, Karin M. .

PHYSICAL REVIEW LETTERS, 2006, 96 (20)

[10] Semiclassical eigenstates of four-sublattice antiferromagnets [J].

Henley, CL ;

Zhang, NG .

PHYSICAL REVIEW LETTERS, 1998, 81 (23) :5221-5224

← 1 2 3 →