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Effects Of Uniaxial Pressure On The Quantum Tunneling Of Magnetization In A High-symmetry Mn-12 Single-molecule Magnet

Title: Effects Of Uniaxial Pressure On The Quantum Tunneling Of Magnetization In A High-symmetry Mn-12 Single-molecule Magnet.
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Name(s): Atkinson, James H., author
Fournet, Adeline D., author
Bhaskaran, Lakshmi, author
Myasoedov, Yuri, author
Zeldov, Eli, author
del Barco, Enrique, author
Hill, Stephen, author
Christou, George, author
Friedman, Jonathan R., author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2017-05-04
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The symmetry of single-molecule magnets dictates their spin quantum dynamics, influencing how such systems relax via quantum tunneling of magnetization (QTM). By reducing a system's symmetry, through the application of a magnetic field or uniaxial pressure, these dynamics can be modified. We report measurements of the magnetization dynamics of a crystalline sample of the high-symmetry [Mn12O12(O2CMe)(16)(MeOH)(4)] center dot MeOH single-molecule magnet as a function of uniaxial pressure applied either parallel or perpendicular to the sample's "easy" magnetization axis. At temperatures between 1.8 and 3.3 K, magnetic hysteresis loops exhibit the characteristic steplike features that signal the occurrence of QTM. After applying uniaxial pressure to the sample in situ, both the magnitude and field position of the QTM steps changed. The step magnitudes were observed to grow as a function of pressure in both arrangements of pressure, while pressure applied along (perpendicular to) the sample's easy axis caused the resonant-tunneling fields to increase (decrease). These observations were compared with simulations in which the system's Hamiltonian parameters were changed. From these comparisons, we determined that parallel pressure induces changes to the second-order axial anisotropy parameter as well as either the fourth-order axial or fourth-order transverse parameter, or to both. In addition, we find that pressure applied perpendicular to the easy axis induces a rhombic anisotropy E approximate to D/2000 per kbar that can be understood as deriving from a symmetry-breaking distortion of the molecule.
Identifier: FSU_libsubv1_wos_000400657600001 (IID), 10.1103/PhysRevB.95.184403 (DOI)
Keywords: complex, resonance, anisotropy, clusters, family, nanomagnets, phase interference, relaxation
Publication Note: The publisher's version of record is available at https://doi.org/10.1103/PhysRevB.95.184403
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000400657600001
Owner Institution: FSU
Is Part Of: Physical Review B.
2469-9950
Issue: iss. 18, vol. 95

Choose the citation style.
Atkinson, J. H., Fournet, A. D., Bhaskaran, L., Myasoedov, Y., Zeldov, E., Del Barco, E., … Friedman, J. R. (2017). Effects Of Uniaxial Pressure On The Quantum Tunneling Of Magnetization In A High-symmetry Mn-12 Single-molecule Magnet. Physical Review B. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000400657600001