Neutron spectroscopy for the magnetic anisotropy of molecular clusters

被引：208

作者：

Caciuffo, R

Amoretti, G

Murani, A

Sessoli, R

Caneschi, A

Gatteschi, D

机构：

[1] Univ Ancona, Dipartimento Sci Mat & Terra, Ist Nazl Fis Mat, I-60131 Ancona, Italy

[2] Univ Parma, Dipartimento Fis, Ist Nazl Fis Mat, I-43100 Parma, Italy

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[4] Univ Florence, Dipartimento Chim, I-50144 Florence, Italy

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.81.4744

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutron spectroscopy has been used to observe transitions between the energy levels for the 21 different orientations of the S = 10 spin ground state of an octanuclear iron molecular cluster (Fe-8) exhibiting quantum tunneling of the magnetization. The results obtained on nondeuterated samples provide the first direct measurement of the zero-field splitting in a large cluster nanomagnet. A reliable and accurate determination of the composition of the cluster's spin wave functions and the spin-Hamiltonian parameters are deduced from the experimental observations, giving crucial information for the study of the macroscopic quantum tunneling process. [S0031 -9007(98)07673-X].

引用

页码：4744 / 4747

页数：4

共 14 条

[1] Abragam A., 1986, ELECT PARAMAGNETIC R
[2] COMPLEX DYNAMICS OF MESOSCOPIC MAGNETS
AWSCHALOM, DD
DIVINCENZO, DP
[J]. PHYSICS TODAY, 1995, 48 (04) : 43 - 48
[3] Superparamagnetic-like behavior in an octanuclear iron cluster
Barra, AL
Debrunner, P
Gatteschi, D
Schulz, CE
Sessoli, R
[J]. EUROPHYSICS LETTERS, 1996, 35 (02): : 133 - 138
[4] High-frequency EPR spectra of a molecular nanomagnet: Understanding quantum tunneling of the magnetization
Barra, AL
Gatteschi, D
Sessoli, R
[J]. PHYSICAL REVIEW B, 1997, 56 (13): : 8192 - 8198
[5] TRANSITION PROBABILITIES FOR F-ELECTRON J-MULTIPLETS IN CUBIC CRYSTAL FIELDS
BIRGENEAU, RJ
[J]. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1972, 33 (01) : 59 - +
[6] Tunneling in mesoscopic magnetic molecules - Comment
Burin, AL
Prokofev, NV
Stamp, PCE
[J]. PHYSICAL REVIEW LETTERS, 1996, 76 (16) : 3040 - 3040
[7] HIGH-SPIN MOLECULES - UNUSUAL MAGNETIC-SUSCEPTIBILITY RELAXATION EFFECTS IN [MN12O12(O(2)CET)(16)(H2O)(3)] (S=9) AND THE ONE-ELECTRON REDUCTION PRODUCT (PPH4)[MN12O12(O(2)CET)(16)(H2O)(4)] (S=19/2)
EPPLEY, HJ
TSAI, HL
DEVRIES, N
FOLTING, K
CHRISTOU, G
HENDRICKSON, DN
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1995, 117 (01) : 301 - 317
[8] Mixed quantum-thermal relaxation in Mn12 acetate molecules
Fort, A
Rettori, A
Villain, J
Gatteschi, D
Sessoli, R
[J]. PHYSICAL REVIEW LETTERS, 1998, 80 (03) : 612 - 615
[9] Macroscopic measurement of resonant magnetization tunneling in high-spin molecules
Friedman, JR
Sarachik, MP
Tejada, J
Ziolo, R
[J]. PHYSICAL REVIEW LETTERS, 1996, 76 (20) : 3830 - 3833
[10] LARGE CLUSTERS OF METAL-IONS - THE TRANSITION FROM MOLECULAR TO BULK MAGNETS
GATTESCHI, D
CANESCHI, A
PARDI, L
SESSOLI, R
[J]. SCIENCE, 1994, 265 (5175) : 1054 - 1058

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