Clemens Ritter

Instrument Scientist (D20/D2B)






+33 (0)4 76 20 7460


+33 (0)4 76 20 7648

Instr. phone

+33 (0)4 76 20 7386/7143


  • Solid State Physics
  • Neutron Powder Diffraction
  • Magnetic Structure Determination
  • Magnetic structure in RFe3(BO3)4 compounds, new Iron Arsenide SC's
  • Structure and magnetism, phase transitions and phase segregations in GMR Manganates
  • Structural and magnetic details, band filling effects in Double Perovskites
  • Crystal and magnetic structure, phase transitions in Magnetocaloric Materials of type R5Ge4-xSix
  • Magnetic structure of Laves Phases, intrinsic and induced moments in RMn2
  • Structure of and Motion in Hydrogen Intercalation Compounds, Chevrel Phases and Cu Spinel Phases
  • Frustrated quantum magnetism, spin-orbit coupling in 4d, 5d systems
  • "Structure and motion of hydrogen in molybdenum bronzes HxMoO3 as studied by nuclear magnetic resonance"
    C. Ritter, W. Mueller-Warmuth, R. Schoellhorn
    J. Chem. Phys. 83 (1985) 6130
  • "Hydrogen Intercalation Compounds"
    C. Ritter
    Z. Phys. Chem. NF. 151 (1987) 51
  • "Polarised neutron study of the magnetic ordering in the simple alloy YFe2"
    C. Ritter
    J. Phys. Condens. Matter 1 (1989) 2765
  • "The magnetic structure of DyMn2"
    C. Ritter, S.H. Kilcoyne, R. Cywinski
    J. Phys. : Condens. Matter 3 (1991) 727
  • "Neutron Diffraction Study of the Crystal Structure of Lithium Intercalated Chevrel Phases"
    C. Ritter, E. Gocke, C. Fischer, R. Schoellhorn
    Mat. Res. Bull. 27 (1992) 1217
  • "Neutron diffraction study of the structure of chalcogen spinels Cu1+yCr2X4 (X=Se, Te)"
    A. Payer, R. Schoellhorn, C . Ritter, W. Paulus
    J. Alloys Comp. 191 (1993) 37
  • "Intrinsic and induced Mn moments in Dy1-xYxMn2"
    C. Ritter, R. Cywinski, S.H. Kilcoyne, S. Mondal, B.D. Rainford
    Phys. Rev. B 50 (1994) 9894
  • "Spin-Glass Insulator State in (Tb-La)2/3Ca1/3MnO3 Perovskite"
    J.M. De Teresa, M.R. Ibarra, J. Garcia, J. Blasco, C. Ritter, P.A. Algarabel, C. Marquina, A. Del Moral
    Phys. Rev. Lett. 76 (1996) 3392
  • "A New Monoclinic Perovskite Allotype in Pr0.6Sr0.4MnO3"
    C. Ritter, P.G. Radaelli, M.R. Lees, J. Barratt, G. Balakrishnan, D. McK. Paul
    J. Sol. St. Chem. 127 (1996) 276
  • "Evidence for magnetic polarons in the magnetoresistive perovskites"
    J.M. De Teresa, M.R. Ibarra, P.A. Algarabel, C. Ritter, C. Marquina, J. Blasco, J. Garcia, A. Del Moral, Z. Arnold
    Nature 386 (1997) 256
  • "Influence of oxygen content on the structural, magnetotransport, and magnetic properties of LaMnO3+"
    C. Ritter, M.R. Ibarra, J.M. De Teresa, P.A. Algarabel, C. Marquina, J. Blasco, J. Garcia, S. Oseroff, S.-W. Cheong
    Phys. Rev. B 56 (1997) 8902
  • "Magnetic structure of 154SmMn2Ge2 as a function of temperature and pressure"
    G.J. Tomka, C. Ritter, P.C. Riedi, Cz. Kapusta, W. Kocemba
    Phys. Rev. B 58 (1998) 6330
  • "Direct evidence of phase segregation and magnetic-field induced structural transition in Nd0.5Sr0.5MnO3 by neutron diffraction"
    C. Ritter, R. Mahendiran, M.R. Ibarra, L. Morellon, A. Maignan, B. Raveau, C.N.R. Rao
    Phys. Rev. B 61 (2000) R9229
  • "Structural and magnetic properties of double perovskites AA'FeMoO6 (AA' = Ba2, BaSr, Sr2 and Ca2)"
    C. Ritter, M.R. Ibarra, L. Morellon, J. Blasco, J. Garcia, J.M. De Teresa
    J. Phys. : Condens. Matter 12 (2000) 1
  • "Structural and magnetic study of Tb1-xCaxMnO3 perovskites"
    J. Blasco, C. Ritter, J. Garcia, J.M. De Teresa, J. Perez-Cacho, M.R. Ibarra 
    Phys. Rev. B 62 (2000) 5609
  • "Magnetic and Structural phase diagram of Tb5(SixGe1-x)4"
    C. Ritter, L. Morellon , P.A. Algarabel, C. Magen, M.R. Ibarra
    Phys. Rev. B 65 (2002) 094405
  • "Magnetic and structural properties of the double-perovskite Ca2FeReO6"
    W. Westerburg, O. Lang, C. Ritter, C. Felser, W. Tremel, G. Jakob
    Sol. State Comm. 122 (2002) 201
  • "Field effect on phase segregation in the electon-doped mixed-valence manganites near a structural instability"
    P.A. Algarabel, J.M. De Teresa, B. Garcia-Landa, L. Morellon, M.R. Ibarra, C. Ritter, R. Mahendiran, A. Maignan, M. Hervieu, C. Martin, B. Raveau, A. Kurbatov, V. Trunov
    Phys. Rev. B 65 (2002) 104437
  • "Structural and magnetic details of 3d-element doped Sr2Fe0.75T0.25MoO6"
    C. Ritter, J. Blasco, J.-M. De Teresa, D. Serrate, L. Morellon, J. Garcia, M. R. Ibarra
    Solid St. Science 6 (2004) 419
  • "Pressure Enhancement of the Giant Magnetocaloric Effect in Tb5Si2Ge2"
    L. Morellon, Z. Arnold, C. Magen, C. Ritter, O. Prokhnenko, Y. Skorokhod, P. A. Algarabel, M. R. Ibarra, J. Kamarad
    Phys. Rev. Lett. 93 (2004) 137201
  • "Investigation of the high Curie temperature in Sr2CrReO6"
    J.M. De Teresa, D. Serrate, C. Ritter, J. Blasco, M.R. Ibarra, L. Morellon, W. Tokarz
    Phys. Rev. B 71 (2005) 092408
  • "Possible quantum critical point in La2/3Ca1/3Mn1-xGaxO3"
    J.M. De Teresa, P.A. Algarabel, C. Ritter, J. Blasco, M.R. Ibarra, L. Morellon, J.I. Espeso, J.C. Gomez-Sal
    Phys. Rev. Lett. 94 (2005) 207205
  • "Magnetic and crystal structures of Er5(SixGe1-x)4"
    C. Ritter, C. Magen, L. Morellon, P.A. Algarabel, M.R. Ibarra, V.K. Pecharsky, A.O. Tsokol, K.A. Gschneidner Jr
    J. Phys.: Condens. Matter 18 (2006) 3937
  • "Observation of a Griffiths-like Phase in the Magnetocaloric Compound Tb5Si2Ge2"
    C. Magen, P.A. Algarabel, L. Morellon, J.P. Araujo, C. Ritter, M.R. Ibarra, A.M. Pereira, J.B. Sousa
    Phys. Rev. Lett. 96 (2006) 167201
  • " Magnetic structure, magnetic interactions and metamagnetism in terbium iron borate TbFe3(BO3)4: a neutron diffraction and magnetization study",
    C. Ritter, A. Balaev, A. Vorotynov , G. Petrakovski, D. Velikanov, V. Temeraov, I. Gudim
    J. Phys.: Condens. Matter 19 (2007) 196227
  • "Infinite-layer iron oxide with a square-planar coordination"
    Y. Tsujimoto, C. Tassel, N. Hayashi, T. Watanabe, H. Kageyama, K. Yoshimura, M. Takano, M. Ceretti, C. Ritter, W. Paulus
    Nature 450 (2007) 1062
  •  "Magnetic structure in iron borates RFe3(BO3)4 (R = Y, Ho) : a neutron diffraction and magnetization study"
    C. Ritter, A. Vorotynov, A. Pankrats, G. Petrakowski, V. Temerov, I. Gudim, R. Szymczak
    J. Phys. : Condens. Matter 20 (2008) 365209
  •  "Magnetic and crystal structure of Ho5(SixGe1-x)4 studied by neutron diffraction"
    C. Ritter, C. Magen, L. Mrellon, P.A. Algarabel, M.R. Ibarra, A.M. Pereira, J.P. Araujo, J.B. Sousa
    Phys. Rev. B 80 (2009) 104427
  • "Coexistence of long-range magnetic order and superconductivity in the pnictide superconductor SmFeAsO1-xFx (x=0, 0.15)"
    D.H. Ryan, J.M. Cadogan, C. Ritter, F. Canepa, A. Palenzona, M. Putti 
    Phys. Rev. B 80 220503 (R)
  • "Phase diagram of NdFeAsO1-xFx: Essential role of chemical composition" 
    L. Malavasi, G.A. Artioli, C. Ritter, M.C. Mozzati, B. Maroni, B. Pahari, A. Caneschi
    JACS 132 (2010) 2417
  • “Long-range magnetic order in CeRu2Al10 studied via muon spin relaxation and neutron diffraction”
    D.D. Khalyavin, A.D. Hillier, D.T. Adroja, A.M. Strydom. P. Manuel, L.C. Chapon, P. Peratheepan, K. Knight, P. Deen, C. Ritter, Y. Muro, T. Takabatake
    Phys. Rev. B 82 (2010) 100405 (R)
  • “Ferromagnetically coupled Shastry-Sutherland quantum spin singlets in (CuCl)LaNb2O7
    C. Tassel, J. Kang, C. Lee, O. Hernandez, Y. Qiu, W. Paulus, E. Collet, B. Lake, T. Guidi, M.-H. Whangbo, C. Ritter, H. Kageyama, S.-H. Lee
    Phys. Rev. Lett. 105 (2010) 167205
  • “Incommensurate spin order in the metallic perovskite MnVO3
    M. Markkula, A.M. Arevalo-Lopez, A. Kusmartseva, J.A. Rodgers, C. Ritter, H. Wua, J.P. Attfield
    Phys. Rev. B 84 (2011) 094450
  • “Negative thermal expansion and antiferromagnetism in the actinide oxypnictide NpFeAsO“
    T. Klimczuk, H.C. Walker, R. Springell, A.B. Shick, A.H. Hill, P. Gaczynski, K. Gofryk, S.A.J. Kimber, C. Ritter, E. Colineau, J.-C. Griveau, D. Bouexiere, R. Eloirdi, R.J. Cava, R. Caciuffo
    Phys. Rev. B 85 (2012) 174506
  • “Field-induced evolution of magnetic ordering in the quantum spin system (CuBr)Sr2Nb3O10 with a 1/3 magnetization plateau”
    C. Ritter, S.M. Yusuf, A.K. Bera, Y. Goto, C. Tassel, H. Kageyama, A.M. Arevalo-Lopez, J.P. Attfield
    Phys. Rev. B 88 (2013) 104401
  • “Symmetry-breaking 60°-spin order in the A-site-ordered perovskite LaMn3V4O12
    T. Saito, M. Toyoda, C. Ritter, S. Zhang, T. Ogushi, J.P. Attfield, Y. Shimakawa
    PRB 90 (2014) 214405
  • “Magnetic structures of R5Ni2In4 and R11Ni4In9 (R = Tb and Ho): strong hierarchy in the temperature dependence of the magnetic ordering in the multiple rare-earth sublattices”
    C. Ritter, A. Provino, P. Manfrinetti, V.K. Pecharsky, K.A. Gscheidner Jr., S.K. Dhar
    J. Phys.: Condens. Matter 27 (2015) 476001
  • “Hydride in BaTiO2.5H0.5: A Labile Ligand in Solid State Chemistry”
    N. Masuda, Y. Kobayashi, O. Hernandez, T. Bataille, S. Paofai, H. Suzuki, C. Ritter, N. Ichijo, Y. Noda, K. Takegoshi, C. Tassel, T. Yamamoto, H. Kageyama
    JACS (2015)