DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Multireference Ab Initio Studies of Magnetic Properties of Terbium-Based Single-Molecule Magnets

Journal Article · · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory

Here, we explore how different chemical environments influence magnetic properties of terbium(III) (Tb)-based single-molecule magnets (SMMs), using first-principles relativistic multireference methods. Recent experiments showed that Tb-based SMMs can have exceptionally large magnetic anisotropy and that they can be used for experimental realization of quantum information applications, with a judicious choice of chemical environment. Here, we perform complete active space self-consistent field calculations including relativistic spin–orbit interaction for representative Tb-based SMMs such as TbPc2 and TbPcNc in three charge states. We calculate the low-energy electronic structure from which we compute the Tb crystal-field (CF) parameters and construct an effective pseudospin Hamiltonian. Our calculations show that the ligand type and fine points of molecular geometry do not affect the gap between the ground-state and first-excited doublets, whereas the latter varies weakly with oxidation number. On the other hand, higher-energy levels have a strong dependence on all these characteristics. For neutral TbPc2 and TbPcNc molecules, the Tb magnetic moment and ligand spin are parallel to each other and the coupling strength between them does not depend much on the ligand type and details of the atomic structure. However, ligand distortion and molecular symmetry play a crucial role in transverse CF parameters which lead to tunnel splitting. The tunnel splitting induces quantum tunneling of magnetization by itself or by combining with other processes. Our results provide insights into the mechanisms of magnetization relaxation in the representative Tb-based SMMs.

Research Organization:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Organization:
San Diego Supercomputer Center (SDSC)
Grant/Contract Number:
SC0018326; DMR060009N
OSTI ID:
1631158
Journal Information:
Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Vol. 123, Issue 32; ISSN 1089-5639
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

References (57)

Single-Molecule Nanomagnets journal August 2010
Self-assembled aggregates formed by single-molecule magnets on a gold surface journal September 2010
Magnetic hysteresis up to 80 kelvin in a dysprosium metallocene single-molecule magnet journal October 2018
Quantum-Tunneling-Induced Kondo Effect in Single Molecular Magnets journal May 2006
Spin polarized transport through a single-molecule magnet: Current-induced magnetic switching journal August 2007
First-Principles Study of Electron Transport through the Single-Molecule Magnet Mn 12 journal June 2009
Real-space observation of spin-split molecular orbitals of adsorbed single-molecule magnets journal January 2012
Heterodimetallic [LnLn′] Lanthanide Complexes: Toward a Chemical Design of Two-Qubit Molecular Spin Quantum Gates journal August 2014
Structural Effects on the Spin Dynamics of Potential Molecular Qubits journal October 2017
Quantum computing in molecular magnets journal April 2001
Electrically driven nuclear spin resonance in single-molecule magnets journal June 2014
Enhancing coherence in molecular spin qubits via atomic clock transitions journal March 2016
Toward Molecular 4f Single-Ion Magnet Qubits journal April 2016
Molecular magnetic hysteresis at 60 kelvin in dysprosocenium journal August 2017
Strategies towards single molecule magnets based on lanthanide ions journal October 2009
Rational Design of Single-Ion Magnets and Spin Qubits Based on Mononuclear Lanthanoid Complexes journal October 2012
Lanthanide Single-Molecule Magnets journal March 2013
Single-molecule magnetism of tetrapyrrole lanthanide compounds with sandwich multiple-decker structures journal January 2016
Lanthanide Double-Decker Complexes Functioning as Magnets at the Single-Molecular Level journal July 2003
Mononuclear Lanthanide Complexes with a Long Magnetization Relaxation Time at High Temperatures:  A New Category of Magnets at the Single-Molecular Level journal August 2004
Upward Temperature Shift of the Intrinsic Phase Lag of the Magnetization of Bis(phthalocyaninato)terbium by Ligand Oxidation Creating an S = 1 / 2 Spin journal September 2004
Crystal structures of tetrabutylammonium bis(phthalocyaninato)terbium(III) methanol solvate hydrate (1:1: 3/2), [N(C4H9)4][Tb(C8H4N2)2]·CH3OH· 3/2 H2O, and tetrabutylammonium bis(phthalocyaninato)dysprosium(III) methanol solvate hydrate (1:1:1), [N(C4H9)4][Dy(C8H4N2)2]·CH3OH·H2O journal June 2006
Significant Increase of the Barrier Energy for Magnetization Reversal of a Single-4f-Ionic Single-Molecule Magnet by a Longitudinal Contraction of the Coordination Space journal September 2007
Spin Dynamics in the Negatively Charged Terbium (III) Bis-phthalocyaninato Complex journal April 2009
Influence of Peripheral Substitution on the Magnetic Behavior of Single-Ion Magnets Based on Homo- and Heteroleptic Tb III Bis(phthalocyaninate) journal November 2012
Direct Observation of Lanthanide(III)-Phthalocyanine Molecules on Au(111) by Using Scanning Tunneling Microscopy and Scanning Tunneling Spectroscopy and Thin-Film Field-Effect Transistor Properties of Tb(III)- and Dy(III)-Phthalocyanine Molecules journal July 2009
Control of the Spin Dynamics of Single‐Molecule Magnets by using a Quasi One‐Dimensional Arrangement journal May 2018
Ab Initio Prediction of Tunneling Relaxation Times and Effective Demagnetization Barriers in Kramers Lanthanide Single-Molecule Magnets journal August 2018
Relay-Like Exchange Mechanism through a Spin Radical between TbPc 2 Molecules and Graphene/Ni(111) Substrates journal October 2016
Ab Initio Crystal Field for Lanthanides journal February 2017
Magnetic Anisotropy, Magneto–Structural Correlations and Mechanism of Magnetic Relaxation in {Dy III N 8 } Complexes: A Theoretical Perspective journal August 2018
Molcas 8: New capabilities for multiconfigurational quantum chemical calculations across the periodic table : Molcas 8 journal November 2015
Quantum electrodynamical corrections to the fine structure of helium journal January 1974
Main Group Atoms and Dimers Studied with a New Relativistic ANO Basis Set December 2003
A complete active space SCF method (CASSCF) using a density matrix formulated super-CI approach journal May 1980
The complete active space SCF (CASSCF) method in a Newton–Raphson formulation with application to the HNO molecule journal February 1981
A mean-field spin-orbit method applicable to correlated wavefunctions journal March 1996
Ab initio calculation of anisotropic magnetic properties of complexes. I. Unique definition of pseudospin Hamiltonians and their derivation journal August 2012
Transformation relations for the conventional O k q and normalised O' k q Stevens operator equivalents with k=1 to 6 and -k⩽q⩽k journal March 1985
Detailed Ab Initio First-Principles Study of the Magnetic Anisotropy in a Family of Trigonal Pyramidal Iron(II) Pyrrolide Complexes journal August 2011
Determination of Ligand-Field Parameters and f-Electronic Structures of Double-Decker Bis(phthalocyaninato)lanthanide Complexes journal April 2003
Luscus: molecular viewer and editor for MOLCAS journal April 2015
Magnetic Interactions in Molecules and Highly Correlated Materials: Physical Content, Analytical Derivation, and Rigorous Extraction of Magnetic Hamiltonians journal September 2013
Giant exchange interaction in mixed lanthanides journal April 2016
Magnetic Interaction Between a Radical Spin and a Single-Molecule Magnet in a Molecular Spin-Valve journal February 2015
The influence of correlation effects on the electronic structure of double-decker bis(phthalocyaninato)-Dy, Tb complexes journal July 2017
Structural Effects on the Spin Dynamics of Potential Molecular Qubits journal October 2017
Heterodimetallic [LnLn′] Lanthanide Complexes: Toward a Chemical Design of Two-Qubit Molecular Spin Quantum Gates journal August 2014
Mononuclear Lanthanide Complexes with a Long Magnetization Relaxation Time at High Temperatures:  A New Category of Magnets at the Single-Molecular Level journal August 2004
Enhancing coherence in molecular spin qubits via atomic clock transitions journal March 2016
Molecular magnetic hysteresis at 60 kelvin in dysprosocenium journal August 2017
Spin polarized transport through a single-molecule magnet: Current-induced magnetic switching journal August 2007
Electrically driven nuclear spin resonance in single-molecule magnets journal June 2014
Luscus: molecular viewer and editor for MOLCAS journal April 2015
Exchange interaction between $J$-multiplets text January 2015
Giant exchange interaction in mixed lanthanides text January 2015
Operating Quantum States in Single Magnetic Molecules: Implementation of Grover's Quantum Algorithm text January 2017

Cited By (1)


Figures / Tables (13)