Research focus

Inorganic solid-state chemistry, in particular the magnetochemistry of intermetallic phases 

PhD, University Münster (Westfälische Wilhelms-Universität, Münster), April 2026

Synthesis, characterisation and physical properties of compounds of the CeCr₂Alio₂₀ structural type, as well as intermetallic stannides

Master's Degree, University Münster, Working Group Prof. Dr. R. R Working Group Prof. Dr. R. Pöttgen, February 2023

Synthesis, structural chemistry and characterisation of intermetallic tin compounds

Bachelorarbeit, Westfälische Wilhelms-Universität Münster, AK Prof. Dr. R. Pöttgen, 2020

Synthese und Charakterisierung neuer, ternarer, rhodiumhaltiger Stannide

Publications

Journals

29. L. Schumacher, J. Wiethölter, O. Janka, J. A. Baldauf, R. Pöttgen
The cadmium-rich intermetallic phases REPd₂Cd₂₀ (RE = Ca, Y, La, Ce, Nd, Eu–Lu)
Z. Kristallogr. 2026, in press
https://doi.org/10.1515/zkri-2026-0015

28. R. Pöttgen, L. Schumacher
Zr₅Pd₉P₇-type platinides Nd₅Sn₉Pt₇ and Gd₅Sn₉Pt₇ − intergrowth structures with ZrNiAl and TiNiSi-related slabs
Z. Naturforsch. 2026, in press
https://doi.org/10.1515/znb-2026-0020

27. L. Schumacher, J. Wiethölter, R. Pöttgen
CeCr₂Al₂₀-type phases AIr₂Cd₂₀ (A = Sr, La-Nd, Sm, Eu) - structure and magnetic properties 
Z. Kristallogr., 2025, 240, 349-358.
 

26. L. Schumacher, R. Pöttgen
Aluminum-rich cage compounds AT₂Al₂₀ (A = Sr, Eu; T = Ti, V) 
Z. Kristallogr. 2025, 240, 343-348
10.1515/zkri-2025-0039 

25. L. Schumacher, F. Schreiner, A. Koldemir, O. Janka, M.R. Hansen, R. Pöttgen
Cadmium-rich intermetallic phases ARh₂Cd₂₀ - structure, magnetic behavior, ¹⁵¹Eu Mössbauer and ¹¹³Cd solid-state NMR spectroscopy 
Dalton Trans. 2025, 54, 8100-8112
https://doi.org/10.1039/d4dt03523b

24. J. Kireev, L. Schumacher, J. Wiethölter, R.H. Kremer, R. Pöttgen
Magnetic-dilution in the solid solutions Eu_1-xCa_xPtSn and Eu_1-xSr_xPtSn - crystal structure, magnetism, and ¹⁵¹Eu and ¹¹⁹Sn Mössbauer spectroscopy 
Dalton Trans. 2025, 54, 16143-16153
https://doi.org/10.1039/d5dt02264a

23. K. Moghaddari, L. Schumacher, R. Pöttgen, G. Kickelbick
Optimizing superparamagnetic ferrite nanoparticles: microwave-assisted vs. thermal decomposition synthesis methods
Nanoscale Adv. 2025, 7, 4563-4576
https://doi.org/10.1039/d5na00244c

22. L. Schumacher, J.A. Baldauf, S. Engel, R. Pöttgen, O. Janka
Pressure dependence of the second-order valence phase transition in Eu₂Al₁₅Pt₆ and the solid solutions Eu₂Al₁₅(Pt_5/6T_1/6)₆ (T = Pd, Ir, Au)
Chem. Mater. 2025, 37, 10030–10035.
10.1021/acs.chemmater.5c02813 

21. T. Block , L. Schumacher , W. Pröbsting , T.H. Ostermann, R. Pöttgen
A switch from homogeneous mixed-valent to trivalent cerium in the solid solutions CeNi_1-xPd_xZn
Z. Naturforsch. 2025, 80b, 319-326.
10.1515/znb-2025-0032 

20. S. Sutorius, D. Patrun, A. Edelmann, L. Schumacher, R. Pöttgen, M. Suta, J. Bruns
Pd[B(S₂O₇)₂]₂ and Pd[B(SO₄)(S₂O₇)]₂: Two borosulfates with Pd²⁺ in octahedral and one with Pd²⁺ in square planar oxygen coordination
Chem. Eur. J. 2025, 31, e202501515. 
0.1002/chem.202501515 

19. E.C.J. Gießelmann, L. Ruck, S. Engel, B. Morgenstern, L. Schumacher, G. Kickelbick, O. Janka
Hf₆Al₇ and Hf_4.44(1)Nb_1.56(1)Al₇-the first fully ordered main group metal containing W₆Fe₇ type compound and its ternary coloring variant
Z. Anorg. Allg. Chem. 2025, 651, e202500044
10.1002/zaac.202500044 

18. A. Mondal, S. Patel, R. Pan, S. K. Kuila, R. Dey, L. Schumacher, A. K. Bera, R. Pöttgen, P.P. Jana
Chemical disorder-driven cluster spin glass in pseudobinary Co₂Zn_10.2Mn_0.8: An experimental and theoretical study
Inorg. Chem. 2025, 64, 6597–6611.
10.1021/acs.inorgchem.4c05506 

17. S. Matsia, A. Papadopoulos, A. Hatzidimitriou, L. Schumacher, A. Koldemir, R. Pöttge, A. Panagiotopoulou, C.T. Chasapis., A. Salifoglou
Hybrid lanthanide metal–organic compounds with flavonoids: Magneto-optical properties and biological activity profiles
Int. J. Mol. Sci. 2025, 26, 1198.
10.3390/ijms26031198 

16. E.C.J. Gießelmann, S. Engel, S. Pohl, M. Briesenick, L.P. Rüthing, C. Kloos, A. Koldemir, L. Schumacher, J. Wiethölter, J. Schmedt auf der Günne, G. Kickelbick, O. Janka
Rapid synthesis of a green emitting Phosphor by sulfidation of intermetallic EuAl₂ and its use in a hybrid material
Chem. Mater. 2025, 37, 97–108.
10.1021/acs.chemmater.4c02093 

15. S. Engel, E.C.J. Gießelmann, L. Schumacher, Y. Zhang, F. Müller, O. Janka
Synthesis, magnetic and NMR spectroscopic properties of the MAl₅Pt₃ series (M = Ca, Y, La-Nd, Sm-Er)
Dalton Trans. 2024, 53, 12176-12188.
10.1039/D4DT01296H 

14. E.C.J. Gießelmann, L. Schumacher, S.F. Matar, S. Engel, G. Kickelbick, O. Janka
Systematic investigations of the solid solution Zr(V_1–xAl_x)₂ Adopting the Laves phase structures
Chem. Eur. J. 2024, 31, e202404248.
10.1002/chem.202404248 

13. L. Schumacher, J. Kösters, L. Hensmann, R. Pöttgen
The solid solutions RETi₂Al_20-xGa_x (0 ≤ x ≤ 10) with RE = Eu, Gd, Tb, Dy and Yb - first gallides with CeCr₂Al₂₀-type structure
Z. Kristallogr. 2024, 239, 367-376.
10.1515/zkri-2024-0111 

12. S. Wittmann, M.M. Murshed, L. Schumacher, A. Koldemir, R. Pöttgen, T.M. Gesing
Synthesis and characterization of mullite-type Sn(Cr_1-xV_x)BO₄: Structural, vibrational, magnetic, and thermal properties
J. Am. Ceram. Soc. 2024, 107, 6465-6476.
10.1111/jace.19928

11. V.A. Yartys, L.G. Akselrud, R.V. Denys, P. Vajeeston, B. Ouladdiaf, R. Dankelman, J. Plomp, A. Koldemir, L. Schumacher, R.K. Kremer, R. Pöttgen, D.S. Wragg, B.G.F. Eggert, V. Berezovets
Crystal, magnetic structures, and bonding interactions in the TiNiSi-Type hydride CeMgSnH: Experimental and computational studies
Chem. Mater. 2024, 36, 6257–6268.
10.1021/acs.chemmater.4c01104 

10. D. Luong, K.A. Gibson, M. Küpers, L. Schumacher, R. Pöttgen, B.P.T. Fokwa
The new High-TC metamagnetic boride Ti₂FeOs₃B₃ containing Fe-ladders: Experimental and computational investigations 
Solid State Sci. 2024, 154, 107574.
10.1016/j.solidstatesciences.2024.107574 

9. K.A. Gibson, D. Luong, P.G.Isaac, L. Schumacher, R. Pöttgen, B.P.T. Fokwa
Computational and experimental investigations of osmium-rich borides Hf₂MOs₅B₂ (M = Mn, Fe, Co): From spin glass to room-temperature magnetic behaviors
Inorg. Chem. 2024, 63(17), 7869-7875.
10.1021/acs.inorgchem.4c00533 

8. L. Schumacher, A. Koldemir, R. Pöttgen
DyIrSn and the Lu₃Co₂In₄-type stannides Sm₃Rh₂Sn₄ and RE₃Ir₂Sn₄ (RE = Y, Sm, Gd-Tm, Lu) 
Z. Naturforsch. 2024, 79b, 127-134.
10.1515/znb-2024-0004 

7. J.M. Gerdes, L. Schumacher, M.R. Hansen, R. Pöttgen
A solid-state ¹⁷¹Yb NMR-spectroscopic characterization of selected divalent ytterbium intermetallics
Z. Naturforsch. 2024, 79b, 13-19.
10.1515/znb-2023-0070 

6. S. Engel, L. Schumacher, O. Janka
Modifying the valence phase transition in Eu₂Al₁₅Pt₆ by the solid solutions Eu₂Al₁₅(Pt_1−xT _x )₆ (T = Pd, Ir, Au; x = 1/6)
Z. Naturforsch. 2024, 79b, 21-27.
10.1515/znb-2023-0072 

5. D. Luong, L. Schumacher, S. Kilic, E. Haddon, R. Pöttgen, B.P.T. Fokwa
Enhancing intrinsic magnetic hardness by modulating antagonistic interactions in the rare-earth-free magnetic solid solution Hf₂Fe_1-δRu_5-xIr_x+δB₂,
Chem. Eur. J. 2023, 30, e202303381.
10.1002/chem.202303381 

4. V.A. Chamard, S.F. Matar, L. Schumacher, C. Paulsen, J. Kösters, T. Block, R. Pöttgen
Cementite-type Y₃Ru
Z. Naturforsch. 2023, 78b, 505-510.
10.1515/znb-2023-0058

3. E.C.J. Gießelmann, S. Engel, I.M. El Saudi, L. Schumacher, M. Radzieowski, J.M. Gerdes, O. Janka
On the RE₂TiAl₃ (RE = Y, Gd-Tm, Lu) Series-The first Aluminum representatives of the Rhombohedral Mg₂Ni₃Si type structure
Solids 2023, 4, 166-180.
10.3390/solids4030011 

2. L. Schumacher, S. Engelbert, S. Klenner, S. F. Matar, R. Pöttgen
RE₃Rh₂Sn₄ (RE = Y, Gd–Tm, Lu) - first stannides with Lu₃Co₂In₄ type structure 
Z. Kristallogr. 2022, 237, 51-59. 
10.1515/znb-2022-0099 

1. L. Schumacher, S. Engelbert, M. K. Reimann, J. Kösters, R. Pöttgen
Intermediate ytterbium valence in YbRhSn₂
Z. Naturforsch. 2022, 77b, 687-692.
10.1515/zkri-2022-0007 

Lectures & Posters

Lectures

2. L. Schumacher, R. Pöttgen
Verbindungen des CeCr₂Al₂₀-Strukturtyps
Hirschegg-Seminar, Hirschegg (Österreich), 13.06.2024-16.06.2024

1. L. Schumacher, R. Pöttgen
Intermetallische Zinnverbindungen
Hirschegg-Seminar, Hirschegg (Österreich), 08.06.2023-11.06.2023