Low-energy spin dynamics in the antiferromagnetic phase of CaFe2As2

被引：25

作者：

Curro, N. J. ^{[1
]}

Dioguardi, A. P. ^{[1
]}

ApRoberts-Warren, N. ^{[1
]}

Shockley, A. C. ^{[1
]}

Klavins, P. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

来源：

NEW JOURNAL OF PHYSICS | 2009年 / 11卷

关键词：

SUPERCONDUCTIVITY; ORDER;

D O I：

10.1088/1367-2630/11/7/075004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present As-75 nuclear magnetic resonance data in the paramagnetic and magnetic states of single-crystal CaFe2As2. The electric field gradient and the internal magnetic field at the As sites change discontinuously below the first-order structural transition at T-0 = 169 K. In the magnetic state, we find a single value of the internal hyperfine field consistent with commensurate antiferromagnetic order of Fe moments pointing in the ab plane. The spin lattice relaxation rate shows Korringa behavior for T less than or similar to T-0/3, reflecting the metallic nature of the ordered state. Surprisingly, T-1(-1) exhibits a small peak at 10 K, revealing the presence of slow spin fluctuations that may be associated with domain wall motion.

引用

页数：10

共 32 条

[1] First-order magnetic transition in single-crystalline CaFe2As2 detected by 75As nuclear magnetic resonance [J].

Baek, S. -H. ;

Curro, N. J. ;

Klimczuk, T. ;

Bauer, E. D. ;

Ronning, F. ;

Thompson, J. D. .

PHYSICAL REVIEW B, 2009, 79 (05)

[2] Microscopic 75As NMR study of the effect of impurities on the first-order spin-density-wave transition in BaFe2As2 [J].

Baek, S. -H. ;

Klimczuk, T. ;

Ronning, F. ;

Bauer, E. D. ;

Thompson, J. D. ;

Curro, N. J. .

PHYSICAL REVIEW B, 2008, 78 (21)

[3] RELAXATION EFFECTS IN NUCLEAR MAGNETIC RESONANCE ABSORPTION [J].

BLOEMBERGEN, N ;

PURCELL, EM ;

POUND, RV .

PHYSICAL REVIEW, 1948, 73 (07) :679-712

[4] STAGGERED MAGNETIZATION IN LA(2-X)SR(X)CUO4 FROM LA-139 NQR AND MU-SR - EFFECTS OF SR DOPING IN THE RANGE 0-LESS-THAN-X-LESS-THAN-0.02 [J].

BORSA, F ;

CARRETTA, P ;

CHO, JH ;

CHOU, FC ;

HU, Q ;

JOHNSTON, DC ;

LASCIALFARI, A ;

TORGESON, DR ;

GOODING, RJ ;

SALEM, NM ;

VOS, KJE .

PHYSICAL REVIEW B, 1995, 52 (10) :7334-7345

[5] Proximity of antiferromagnetism and superconductivity in LaFeAsO1-xFx:: Effective Hamiltonian from ab initio studies [J].

Cao, Chao ;

Hirschfeld, P. J. ;

Cheng, Hai-Ping .

PHYSICAL REVIEW B, 2008, 77 (22)

[6] MAGNETIC PHASE-DIAGRAM OF LIGHTLY DOPED LA2-XSRXCUO4 FROM LA-139 NUCLEAR-QUADRUPOLE RESONANCE [J].

CHOU, FC ;

BORSA, F ;

CHO, JH ;

JOHNSTON, DC ;

LASCIALFARI, A ;

TORGESON, DR ;

ZIOLO, J .

PHYSICAL REVIEW LETTERS, 1993, 71 (14) :2323-2326

[7] Inhomogeneous low frequency spin dynamics in La1.65Eu0.2Sr0.15CuO4 [J].

Curro, NJ ;

Hammel, PC ;

Suh, BJ ;

Hücker, M ;

Büchner, B ;

Ammerahl, U ;

Revcolevschi, A .

PHYSICAL REVIEW LETTERS, 2000, 85 (03) :642-645

[8] Magnetic order close to superconductivity in the iron-based layered LaO1-xFxFeAs systems [J].

de la Cruz, Clarina ;

Huang, Q. ;

Lynn, J. W. ;

Li, Jiying ;

Ratcliff, W., II ;

Zarestky, J. L. ;

Mook, H. A. ;

Chen, G. F. ;

Luo, J. L. ;

Wang, N. L. ;

Dai, Pengcheng .

NATURE, 2008, 453 (7197) :899-902

[9] High-energy spin excitations in BaFe2As2 observed by inelastic neutron scattering [J].

Ewings, R. A. ;

Perring, T. G. ;

Bewley, R. I. ;

Guidi, T. ;

Pitcher, M. J. ;

Parker, D. R. ;

Clarke, S. J. ;

Boothroyd, A. T. .

PHYSICAL REVIEW B, 2008, 78 (22)

[10] Lattice collapse and quenching of magnetism in CaFe2As2 under pressure: A single-crystal neutron and x-ray diffraction investigation [J].

Goldman, A. I. ;

Kreyssig, A. ;

Prokes, K. ;

Pratt, D. K. ;

Argyriou, D. N. ;

Lynn, J. W. ;

Nandi, S. ;

Kimber, S. A. J. ;

Chen, Y. ;

Lee, Y. B. ;

Samolyuk, G. ;

Leao, J. B. ;

Poulton, S. J. ;

Bud'ko, S. L. ;

Ni, N. ;

Canfield, P. C. ;

Harmon, B. N. ;

McQueeney, R. J. .

PHYSICAL REVIEW B, 2009, 79 (02)

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