Clemens Ritter

	DIFFRACTION GROUP

Clemens Ritter	Physicist, PhD

	Instrument Scientitst (D2B, D1A PWD)

	e-mail:	ritter@ill.fr
	Room:	145-ILL4
	Phone:	+33 (0)4.76.20.74.60
	FAX:	+33 (0)4.76.20.76.48
	D2B phone:	+33 (0)4.76.20.72.29

Research interests

Solid State Physics
Neutron Powder Diffraction
Magnetic Structure Determination

Special Interest

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 R₅Ge_4-xSi_x
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

Selected representative publications

C. Ritter, W. Mueller-Warmuth, R. Schoellhorn
Structure and motion of hydrogen in molybdenum bronzes HxMoO3 as studied by nuclear magnetic resonance
J. Chem. Phys. 83 (1985) 6130
C. Ritter
Hydrogen Intercalation Compounds
Z. Phys. Chem. NF. 151 (1987) 51
C. Ritter
Polarised neutron study of the magnetic ordering in the simple alloy YFe2
J. Phys. Condens. Matter 1 (1989) 2765
C. Ritter, S.H. Kilcoyne, R. Cywinski
The magnetic structure of DyMn₂
J. Phys. : Condens. Matter 3 (1991) 727
C. Ritter, E. Gocke, C. Fischer, R. Schoellhorn
Neutron Diffraction Study of the Crystal Structure of Lithium Intercalated Chevrel Phases
Mat. Res. Bull. 27 (1992) 1217
A. Payer, R. Schoellhorn, C . Ritter, W. Paulus
Neutron diffraction study of the structure of chalcogen spinels Cu_1+yCr₂X₄ (X=Se, Te)
J. Alloys Comp. 191 (1993) 37
C. Ritter, R. Cywinski, S.H. Kilcoyne, S. Mondal, B.D. Rainford
Intrinsic and induced Mn moments in Dy_1-xY_xMn₂
Phys. Rev. B 50 (1994) 9894
J.M. De Teresa, M.R. Ibarra, J. Garcia, J. Blasco, C. Ritter, P.A. Algarabel, C. Marquina, A. Del Moral
Spin-Glass Insulator State in (Tb-La)_2/3Ca_1/3MnO₃ Perovskite
Phys. Rev. Lett. 76 (1996) 3392
C. Ritter, P.G. Radaelli, M.R. Lees, J. Barratt, G. Balakrishnan, D. McK. Paul
A New Monoclinic Perovskite Allotype in Pr_0.6Sr_0.4MnO₃
J. Sol. St. Chem. 127 (1996) 276
J.M. De Teresa, M.R. Ibarra, P.A. Algarabel, C. Ritter, C. Marquina, J. Blasco, J. Garcia, A. Del Moral, Z. Arnold
Evidence for magnetic polarons in the magnetoresistive perovskites
Nature 386 (1997) 256
C. Ritter, M.R. Ibarra, J.M. De Teresa, P.A. Algarabel, C. Marquina, J. Blasco, J. Garcia, S. Oseroff, S.-W. Cheong
Influence of oxygen content on the structural, magnetotransport, and magnetic properties of LaMnO³⁺
Phys. Rev. B 56 (1997) 8902
G.J. Tomka, C. Ritter, P.C. Riedi, Cz. Kapusta, W. Kocemba
Magnetic structure of ¹⁵⁴SmMn₂Ge₂ as a function of temperature and pressure
Phys. Rev. B 58 (1998) 6330
C. Ritter, R. Mahendiran, M.R. Ibarra, L. Morellon, A. Maignan, B. Raveau, C.N.R. Rao
Direct evidence of phase segregation and magnetic-field induced structural transition in Nd_0.5Sr_0.5MnO₃ by neutron diffraction
Phys. Rev. B 61 (2000) R9229
C. Ritter, M.R. Ibarra, L. Morellon, J. Blasco, J. Garcia, J.M. De Teresa
Structural and magnetic properties of double perovskites AA'FeMoO₆ (AA' = Ba₂, BaSr, Sr₂ and Ca₂)
J. Phys. : Condens. Matter 12 (2000) 1
J. Blasco, C. Ritter, J. Garcia, J.M. De Teresa, J. Perez-Cacho, M.R. Ibarra
Structural and magnetic study of Tb1-xCaxMnO3 perovskites
Phys. Rev. B 62 (2000) 5609
C. Ritter, L. Morellon , P.A. Algarabel, C. Magen, M.R. Ibarra
Magnetic and Structural phase diagram of Tb₅(Si_xGe_1-x)₄
Phys. Rev. B 65 (2002) 094405
W. Westerburg, O. Lang, C. Ritter, C. Felser, W. Tremel, G. Jakob
Magnetic and structural properties of the double-perovskite Ca₂FeReO₆
Sol. State Comm. 122 (2002) 201
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
Field effect on phase segregation in the electon-doped mixed-valence manganites near a structural instability
Phys. Rev. B 65 (2002) 104437
C. Ritter, J. Blasco, J.-M. De Teresa, D. Serrate, L. Morellon, J. Garcia, M. R. Ibarra
Structural and magnetic details of 3d-element doped Sr₂Fe_0.75T_0.25MoO₆
Solid St. Science 6 (2004) 419
L. Morellon, Z. Arnold, C. Magen, C. Ritter, O. Prokhnenko, Y. Skorokhod, P. A. Algarabel, M. R. Ibarra, J. Kamarad
Pressure Enhancement of the Giant Magnetocaloric Effect in Tb₅Si₂Ge₂
Phys. Rev. Lett. 93 (2004) 137201
J.M. De Teresa, D. Serrate, C. Ritter, J. Blasco, M.R. Ibarra, L. Morellon, W. Tokarz
Investigation of the high Curie temperature in Sr₂CrReO₆
Phys. Rev. B 71 (2005) 092408
J.M. De Teresa, P.A. Algarabel, C. Ritter, J. Blasco, M.R. Ibarra, L. Morellon, J.I. Espeso, J.C. Gomez-Sal
Possible quantum critical point in La_2/3Ca_1/3Mn_1-xGa_xO₃
Phys. Rev. Lett. 94 (2005) 207205
C. Ritter, C. Magen, L. Morellon, P.A. Algarabel, M.R. Ibarra, V.K. Pecharsky, A.O. Tsokol, K.A. Gschneidner Jr
Magnetic and crystal structures of Er₅(Si_xGe_1-x)₄
J. Phys.: Condens. Matter 18 (2006) 3937
C. Magen, P.A. Algarabel, L. Morellon, J.P. Araujo, C. Ritter, M.R. Ibarra, A.M. Pereira, J.B. Sousa
Observation of a Griffiths-like Phase in the Magnetocaloric Compound Tb₅Si₂Ge₂
Phys. Rev. Lett. 96 (2006) 167201

Clemens Ritter

Physicist, PhD

Research interests

Special Interest

Selected representative publications