esr

High-frequency ESR spectroscopy

Electron spin resonance spectroscopy provides valuable information on the dynamic magnetic properties of materials. It is based on the absorption of microwave radiation - our experiment covers the range 30 GHz - 1.2 THz - by materials exposed to external magnetic fields. It provides a variety of information on different classes of magnetic materials, such as:

Spin states and spin structure
Magnetic anisotropy
Magnetic interaction
Spin dynamics
Lattice dynamics
Low-energy excitations
Local crystal fields
Spin-orbit coupling

Journal publications (ESR group)

Low-energy magnon excitations and emerging anisotropic nature of short-range order in CrI3
M. Jonak, E. Walendy, J. Arneth, M. Abdel-Hafiez, and R. Klingeler, Phys. Rev. B 106, 214412 (2022)
Role of magnetoelastic coupling and magnetic anisotropy in MnTiO3
L. Gries, M. Jonak, A. Elghandour, K. Dey, R. Klingeler, Phys. Rev. B 106, 174425
Probing the Origin of Ferro-/Antiferromagnetic Exchange Interactions in Cu(II)–4f Complexes
N. Ahmed, T. Sharma, L. Spillecke, C. Koo, K.U. Ansari, S. Tripathi, A. Caneschi, R. Klingeler, G. Rajaraman, M. Shanmugam, Inorg. Chem. 61, 5572–5587 (2022)
Role of Coordination Geometry on the Magnetic Relaxation Dynamics of Isomeric Five-Coordinate Low-Spin Co(II) Complexes
L. Spillecke, S. Tripathi, C. Koo, A. Bahr, A. Swain, R. Halder, M. Ansari, J. Jasinski, G. Rajaraman, M. Shanmugam, R. Klingeler, Inorg. Chem 61, 317–327 (2022)
Magnetic behavior of the novel pentagonal-bipyramidal Erbium(III) complex (Et3NH)[Er(H2DAPS)Cl2]: high-frequency EPR study and crystal-field analysis
L. Spillecke, C. Koo, O. Maximova, V.S. Mironov, V.A. Kopotkov, D.V. Korchagin, A. Vasiliev, E.B. Yagubskii, R. Klingeler, Dalton Transactions 50, 18143-18154 (2021)
A high-frequency EPR study of magnetic anisotropy and intermolecular interactions on Co(II) ions
Lena Spillecke, Shalini Tripathi, Changhyun Koo, Mursaleem Ansari, Shefali Vaidya, Amaleswari Rasamsetty, Talal Mallah, Gopalan Rajaraman, Maheswaran Shanmugam, Rüdiger Klingeler, Polyhedron 208, 115389 (2021)
Validation of Ab-Initio-Predicted Magnetic Anisotropies and Magneto-structural Correlations in Linear Heterotrinuclear DyIII-NiII2 Compounds
P. Comba, M. Enders, M. Großhauser, M. Hiller, R. Klingeler, C. Koo, D. Müller, G. Rajaraman, A. Swain, M. Tavhelidse, H. Wadepohl, Chem. Eur. J. 27, 9372–9382 (2021)
Exceptional field dependence of antiferromagnetic magnons in LiFePO4
J. Werner, C. Neef, C. Koo, A. Ponomaryov, S. Zvyagin, R. Klingeler , Phys. Rev. B 103, 174406 (2021)
Structure-property correlationin stabilizing axial magnetic anisotropyin octahedral Co(II) complexes
S. Tripathi, S. Vaidya, N. Ahmed, E. Andreasen Klahn, H. Cao, L. Spillecke, Ch. Koo, S. Spachmann, R. Klingeler*, G. Rajaraman*, J. Overgaard*, M. Shanmugam*, Cell Reports Physical 2, 100404 (2021)
Antisite disorder in the battery material LiFePO4
J. Werner, C. Neef, C. Koo, S. Zvyagin, A. Ponomaryov, and R. Klingeler, Phys. Rev. Materials 4, 115403 (2020)
The first pentagonal-bipyramidal vanadium(III) complexes with a Schiff-base N3O2 pentadentate ligand: synthesis, structure and magnetic properties,
Tamara A. Bazhenova, Leokadiya V. Zorina, Sergey V. Simonov, Vladimir S. Mironov, Olga V. Maximova, Lena Spillecke, Changhyun Koo, Rüdiger Klingeler, Yuriy V. Manakin, Alexander N. Vasiliev , Eduard B. Yagubskii, Dalton Transactions 49, 15287 (2020)
Thermodynamic and resonant properties of mixed spin systems ACuFe2(VO4)3 (A = Li, Na)
A. Koshelev, K. Zakharov, O. Volkova, L. Shvanskaya, F. Theuss, C. Koo, R. Klingeler, S. Kundu, S. Bachhar, A.V. Mahajan, P. Khuntia, S. Kamusella, H.-H. Klauss, D. Khanam, B. Rahaman, T. Saha-Dasgupta, A. Vasiliev, Journal of Alloys and Compounds 842, 155763 (2020)
Influence of Counter-Anion on the Zero Field Splitting of Tetrahedral Co(II) Thiourea Complexes
S. Tripathi, S. Vaidya, K.U. Ansari, N. Ahmed, E. Riviere, L. Spillecke, C. Koo, R. Klingeler, T. Mallah, G. Rajaraman, M. Shanmugam, Inorg. Chem. 58, 9085-9100 (2019)
The decisive role of magnetic anisotropy in honeycomb layered Li3Ni2SbO6 and Na3Ni2SbO6
J. Werner, W. Hergett, J.Park, C.Koo, E.A.Zvereva, A.N.Vasiliev, R.Klingeler, J. Magn. Magn. Mat. 481, 100 (2019)
High-frequency EPR study on Cu4Cu- and Co4Co-metallacrown complexes,
C. Koo, J. Park, J. Butscher, E. Rentschler, R. Klingeler, J. Magn. Magn. Mat. 477, 340 (2019)
Magnetoelastic coupling and ferromagnetic-type in-gap spin excitations in multiferroic α-Cu2V2O7
L. Wang, J. Werner, A. Ottmann, R. Weis, M. Abdel-Hafiez, J. Sannigrahi, S. Majumdar, Ch. Koo, R. Klingeler*, New J. Phys. 20, 063045 (2018)
Magnetism and the phase diagram of MnSb2O6
C. Koo, J. Werner, M. Tzschoppe, M. Abdel-Hafiez, P. K. Biswas, R. Sarkar, H.-H. Klauss, G. V. Raganyan, E. A. Ovchenkov, A. Yu. Nikulin, A. N. Vasiliev, E. A. Zvereva, and R. Klingeler*, Phys. Rev. B 97, 224416 (2018)
Electronic structure and magnetic properties of the strong-rung spin-1 ladder compound Rb3Ni2(NO3)7
Z. V. Pchelkina, V. V. Mazurenko, O. S. Volkova, E. B. Deeva, I. V. Morozov, V. V. Shutov, S. I. Troyanov, J. Werner, C. Koo, R. Klingeler, A. N. Vasiliev, Phys. Rev. B 97, 144420 (2018)
Correlation of structural and magnetic properties in a set of mononuclear lanthanide complexes
P. Comba, L.J. Daumann, R. Klingeler, C. Koo, M.J. Riley, A.E. Roberts, H. Wadepohl, J. Werner, Chemistry – Eur. J. 24, 5319 –5330 (2018)
Tri- (M = CuII) and hexanuclear (M = NiII, CoII) heterometallic coordination compounds with ferrocene monocarboxylate ligands: Solid-state structures and thermogravimetric, electrochemical and magnetic properties
K. Müller, M. Korb, C. Koo, R. Klingeler, D. Miesel, A. Hildebrandt, T. Rüffer, H. Lang, Polyhedron 138, 185-193 (2017)
Zigzag spin structure in layered honeycomb Li3Ni2SbO6: A combined diffraction and antiferromagnetic resonance study
A.I. Kurbakov*, A.N. Korshunov, S.Yu. Podchezertsev, A.L. Malyshev, M.A. Evstigneev, F. Damay, J. Park, C. Koo, R. Klingeler*, E.A. Zvereva, V.B. Nalbandyan, Phys. Rev. B 96, 024417 (2017)
Anisotropy governed competition of magnetic phases in the honeycomb quantum magnet Na3Ni2SbO6 studied by dilatometry and high-frequency ESR
J. Werner, W. Hergett, M. Gertig, J. Park, C. Koo, R. Klingeler*, Phys. Rev. B 95, 214414 (2017)
A three-pronged attack to investigate the electronic structure of a family of ferromagnetic Fe4Ln2 cyclic coordination clusters; a combined magnetic susceptibility, HF-EPR and 57Fe Mössbauer study (Cover letter)
S.F.M. Schmidt, C. Koo, V. Mereacre, J. Park, D.W. Heermann, V. Kataev, C.E. Anson, D. Prodius, G. Novitchi, R. Klingeler*, A.K. Powell*, Inorg. Chem. 56, 4796–4806 (2017)
Magnetic anisotropy and the phase diagram of chiral MnSb2O6
J. Werner, C. Koo, R. Klingeler*, A. N. Vasiliev, Y. A. Ovchenkov, A. S. Polovkova, G. V. Raganyan, and E. A. Zvereva, Phys. Rev. B 94, 104408 (2016)
Static and Dynamic Magnetic Response of Fragmented Haldane-like Spin Chains in Layered Li3Cu2SbO6
C. Koo, E.A. Zvereva, I.L. Shukaev, M. Richter, M.I. Stratan, A.N. Vasiliev, V.B. Nalbandyan, R. Klingeler*, J. Phys. Soc. Jpn. 85, 084702 (2016)
1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite
A. N. Vasiliev*, O. S. Volkova, E. A. Zvereva, E. A. Ovchenkov, I. Munaò, L. Clark, P. Lightfoot, E. L. Vavilova, S. Kamusella, H.-H. Klauss, J. Werner, C. Koo, R. Klingeler, A. A. Tsirlin, Phys. Rev. B 93, 134401
Magnetic interactions in a series of homodinuclear lanthanide complexes
P. Comba*, M. Großhauser, R. Klingeler, C. Koo, Y. Lan, D. Müller, J. Park, A. Powell, M.J. Riley, H. Wadepohl, Inorg. Chem. 54, 11247-11258 (2015)

Finished theses (ESR group)

Electron Spin Resonance and Ab-Initio Multiplet Ligand Field Theory Studies on the Trigonal Trinuclear Complexes NMe4[TM3(μ3-F)(TFA)6(Py)3] (TM = Co, Cu)
Kevin Ackermann, Masterarbeit, 2023
Electron Spin Resonance Studies on Frustrated Low Dimensional PbCuSeO4(OH)2 and GdInO3
Rahel Ohlendorf, Masterarbeit, 2023
Low-Energy Magnetic Excitations and Magnetisation in Magnetoelectric Antiferromagnets MnTiO3 and LiMnPO4 and in van-der-Waals Ferromagnet CrI3
Martin Jonak, Dissertation, 2022
Elektronenspinresonanz-Spektroskopie und Messungen der Magnetisierung mononuklearer Lanthanoidkomplexe
Johannes Hägele, Bachelorarbeit, 2022
Magnetische Untersuchungen an quasi-1D Spinketten in PbCuSeO4(OH)2 und mononuklearen metallorganischen Cr(II) Komplexen
Daniel Knauer, Bachelorarbeit, 2022
ESR Spectroscopy on Quasi-One-Dimensional Quantum Spin Systems
Paula Feltes, Masterarbeit, 2022
High-frequency / High-eld Electron Paramagnetic Resonance Investigations on Metal-Organic Molecular Compounds
Lena Spillecke, Dissertation, 2022
Experimentelle Untersuchungen der Magnetisierung und der Elektronenspinresonanz an Übergangsmetallverbindungen mit konkurrierenden Wechselwirkungen
Johannes Werner, Dissertation, 2020
Experimentelle Untersuchungen der Magnetisierung und der Elektronenspinresonanz an Übergangsmetallverbindungen mit konkurrierenden Wechselwirkungen
Johannes Werner, Dissertation, 2019
High-Frequency Electron Paramagnetic Resonance Studies on Mn2 and Co-complexes
Sajeedeh Shabazi, Masterarbeit, 2019
Mixed-spin chains in ACuFe2(VO4)3 studied by ESR and static magnetisation
Florian Theuss, Masterarbeit, 2019
High-Frequency Electron Paramagnetic Resonance and Magnetic Studies on Fe2Ln2 (Ln = Y, Gd, Dy) Complexes
Silvia Menghi, Masterarbeit, 2018
HF-ESR-Spektroskopie und Messungen der statischen Suszeptibilität an Co1- und Co2-metallorganischen Komplexen
Felix Spathelf, Bachelorarbeit, 2018
High-Frequency Electron Spin Resonance and Magnetisation Studies on Li2FeSiO4 and Li2CuHfO4
Fabian Billert, Masterarbeit, 2017
Messungen der statischen Suszeptibilität und hochfrequente Elektronenspinresonanz-Spektroskopie an Cu2- und Fe2-metallorganischen Komplexen
Marco Hoffmann, Bachelorarbeit, 2017
High-Frequency and X-Band Electron Spin Resonance Investigation of Ni(II) Complexes and Ferritin
Sven Spachmann, Masterarbeit, 2017
Hochfrequenz-Elektronenspinresonanz-Spektroskopie an heterometallischen 3d- und 4f- Komplexen
Julian Butscher, Bachelorarbeit, 2017
Statische und dynamische magnetische Eigenschaften von metallorganischen Ni2- und Ni2-Lanthanoid-Verbindungen
Msia Tavhelidse, Masterarbeit, 2016
High-frequency EPR studies on metal-organic materials
Gabriel Pür, Masterarbeit, 2016
Hochfrequenz-Elektronen-Spin-Resonanz-Spektroskopie an antiferromagnetischen Übergangsmetallverbindungen
Johannes Werner, Masterarbeit, 2015
High-frequency EPR studies on metal-organic systems and transition metal compounds
Jaena Park, Dissertation, 2015
Hochfeld Elektronen-Spin-Resonanz Spektroskopie an Na₃Co₂SbO₆ und LiMn₂TeO₆
Sascha Jung, Bachelorarbeit, 2015
Hochfeld Elektronen-Spin-Resonanz Messungen an Na3Cu2SbO6 und Li3Cu2SbO6
Michael Richter, Bachelorarbeit, 2014
Hochfeld-/Hochfrequenz-ESR-Spektroskopie an einkristallinem Li(Mn,Ni)PO4
Msia Tavhelidse, Bachelorarbeit, 2014

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