Effects of nuclear spins on the quantum relaxation of the magnetization for the molecular nanomagnet Fe8

被引：140

作者：

Wernsdorfer, W

Caneschi, A

Sessoli, R

Gatteschi, D

Cornia, A

Villar, V

Paulsen, C

机构：

[1] CNRS, Lab L Neel, UJF, F-38042 Grenoble 9, France

[2] Univ Florence, Dept Chem, I-50144 Florence, Italy

[3] Univ Modena, Dept Chem, I-41100 Modena, Italy

[4] CNRS, UJF, CRTBT, F-38042 Grenoble, France

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.84.2965

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

strong influence of nuclear spins on resonant quantum tunneling in the molecular cluster Fe-8 is demonstrated for the first time by comparing the relaxation rate of the standard Fee sample with two isotopic modified samples: (i) Fe-56 is replaced by Fe-57, and (ii) a fraction of H-1 is replaced by H-2. By using a recently developed "hole digging" method, we measured an intrinsic broadening which is driven by the hyperfine fields. Our measurements are in good agreement with numerical hyperfine calculations. For T > 1.5 K, the influence of nuclear spins on the relaxation rate is less important, suggesting that spin-phonon coupling dominates the relaxation rate.

引用

页码：2965 / 2968

页数：4

共 28 条

[1] 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
[2] DENSITY-FUNCTIONAL THERMOCHEMISTRY .3. THE ROLE OF EXACT EXCHANGE
BECKE, AD
[J]. JOURNAL OF CHEMICAL PHYSICS, 1993, 98 (07) : 5648 - 5652
[3] Bencini A.Gatteschi., 1990, EPR of Exchange Coupled Systems
[4] QUANTAL PHASE-FACTORS ACCOMPANYING ADIABATIC CHANGES
BERRY, MV
[J]. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1984, 392 (1802) : 45 - 57
[5] The molecular approach to nanoscale magnetism
Caneschi, A
Gatteschi, D
Sangregorio, C
Sessoli, R
Sorace, L
Cornia, A
Novak, MA
Paulsen, C
Wernsdorfer, W
[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 200 (1-3) : 182 - 201
[6] Dipolar interaction and incoherent quantum tunneling: a Monte Carlo study of magnetic relaxation
Cuccoli, A
Fort, A
Rettori, A
Adam, E
Villain, J
[J]. EUROPEAN PHYSICAL JOURNAL B, 1999, 12 (01) : 39 - 46
[7] 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
[8] FRISCH MJ, 1998, GAUSSIAN 98, pA5
[9] TOPOLOGICALLY QUENCHED TUNNEL SPLITTING IN SPIN SYSTEMS WITHOUT KRAMERS DEGENERACY
GARG, A
[J]. EUROPHYSICS LETTERS, 1993, 22 (03): : 205 - 210
[10] Spin relaxation in Mn12-acetate
Leuenberger, MN
Loss, D
[J]. EUROPHYSICS LETTERS, 1999, 46 (05): : 692 - 698

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