Selected Publications

Complete list as a pdf-file

P. Lemmens on the Archiv preprint server.

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Review articles on novel materials, quantum spin systems, multifunctional materials, ..

Magnetic Light Scattering in Low-Dimensional Quantum Spin Systems,
P. Lemmens, G. Güntherodt und C. Gros, entstanden aus der Habilitation des ersten Autors,
Physics Reports 375, 1-103 (2003).

Light scattering of magnets in the proximity to quantum criticality, P. Lemmens,
in „Spectroscopy of Emergent Materials“, Eds. E. Faulques, et al.,
Kluver Intern. Press, New York, (2004).

Spin - Orbit - Topology, a triptich, P. Lemmens, P. Millet, in “Quantum Magnetism”,
Eds. U. Schollwöck, et al., Springer, Lecture Notes in Physics, Heidelberg-New York, (2004).

    
 

Novel hydrated superconductors, thermoelectric, Kagome materials

Approaching the ground state of the kagomé antiferromagnet,
M. Valldor, P. Lemmens, and W. Schweika, Phys. Rev. Lett. 98, 067201 (2007).

Anomalous electronic Raman scattering in NaxCoO2 ∙yH2O, 
P. Lemmens, K.-Y. Choi, V. Gnezdilov, E.Ya. Sherman, D.P. Chen, C.T. Lin, F.C. Chou, and B. Keimer, Phys. Rev. Lett 96, 167204 (2006).

Sodium Cobaltates: Crystal Growth, Structure, Thermoelectricity, and Superconductivity, 
C.T. Lin, D.P. Chen, A. Maljuk, and P. Lemmens, Journ. of Cryst. Growth. 292, 422-428 (2006).

Single crystal growth and investigation of NaxCoO2 and NaxCoO2 yH2O,
D.P. Chen, et al., Phys. Rev. B 70,  024506 (2004).

Effect of Na content and hydration on the excitation spectrum of the cobaltite NaxCoO2 yH2O,
P. Lemmens, et al., JPCM 16, S857 (2004).

Homogeneous antiferromagnetism in Na0.82CoO2 single crystals,
S. Bayrakci, et al., Phys. Rev. B 69, 100410 (2004)  


Titanates

Spin gap formation in the quantum spin systems TiOX, X=Cl and Br,
P. Lemmens, et al., NJP 7, 74 (2005).

Analysis of the phonon spectrum in the titanium oxyhalide TiOBr,
G. Caimi, et al., JPCM 16, 5583 (2004)

Giant phonon softening in the pseudo-gap phase of TiOCl,
P. Lemmens, et al., Phys. Rev. B 70, 134429 (2004).

Infrared optical properties of the spin-1/2 quantum magnet TiOCl,
G. Caimi, et al., Phys. Rev. B 69, 125108 (2004).


 

Experiments under high pressure

Crystal structure and lattice dynamics of SrCu2(BO3)2 at high pressure,
I. Loa, et al., Physica B 359, 980 (2005).

Unusual criticality of Cu2Te2O5Br2 under pressure,
J. Kreitlow, et al., JMMM 290, 959 (2005). 

The effect of pressure on the structural properties of the spin-tetrahedra compound Cu2Te2O5Br2, X. Wang, et al., JPCM 17, 1-6 (2005).


Vanadates

Random magnetism in the frustrated triangular spin ladder KCu5V3O13,
K.Y. Choi, et al., Phys. Rev. B 70, 174417 (2004).

Magnetic exchange in a low-dimensional magnetic oxide (Cu,Zn)2V2O7,
V. Kataev, et al., Journ. Mag. Mag. Mat. 272-276, 399 (2004).

Spin dynamics in the Quantum Spin System KCu5V3O13,
H.-H. Klauss, et al., Physica B 326, 436-439 (2003).

Interplay between structure and magnetism in the spin chain compound (Cu,Zn)2V2O7,
J. Pommer, et al., Phys. Rev. B 67, 214410 (2003).

Quantum instabilities in spin tetrahedron systems & other frustrated topologies

Longitudinal magnon in the tetrahedral quantum spin system Cu2Te2O5Br2
near quantum criticality,
C. Gros, P. Lemmens, M. Vojta, R. Valenti, K.-Y. Choi, H. Kageyama, Z. Hiroi,
N.V. Mushnikov, T. Goto, M. Johnsson, P. Millet, Phys. Rev. B 67, 174405 (2003) .

Magnetic Raman scattering of the ordered tetrahedral spin-1/2 clusters
in Cu2Te2O5(Br1-xClx)2 compounds,
J. Jensen, P. Lemmens, C. Gros, Europhys. Lett. 64, 689-695 (2003).

Evidence for an unconventional magnetic instability in the spin-tetraedra system Cu2Te2O5Br2 ,
P. Lemmens et al., Phys. Rev. Lett. 87, 227201 (2001).

Ultrasonic attenuation on the magnetic field-induced magnetic ordering in TlCuCl3,
E. Ya. Sherman, P. Lemmens, B. Busse, A. Oosawa, H. Tanaka,
Phys. Rev. Lett. (2003).

Lone-Pair Systeme / Novel Materials, lone pair systems

Magnetic Raman scattering of the ordered tetrahedral spin-1/2 clusters in Cu2Te2O5(Br1-xClx)2 compounds,
J. Jensen, et al., EPL 64, 689-695 (2003).

Crystal structure, magnetic properties and conductivity of CuSbTeO3Cl2,
R. Becker, et al., Solid St. Sci. 5, 1411 (2003).

Longitudinal magnon in the tetrahedral quantum spin system Cu2Te2O5Br2 near quantum criticality,
C. Gros, et al., Phys. Rev. B 67, 174405 (2003).

Search for Quantum Criticality in the Spin Tetrahedra System Cu2Te2O5(Br,Cl)2,
P. Lemmens, et al., Physica B 329-333, 1049-1050 (2003).

Nickelates

Phonons and Magnons in stripe-ordered nickelates: A Raman scattering study,
V.P. Gnezdilov, et al., LTP 31, 205-212 (2005).

Phonons and Magnons in La5/3Sr1/3NiO4 single crystal,
V. Gnezdilov, et al., in „Spectroscopy of Emergent Materials“, Kluwer, New York (2004).

Crystal Structure and Magnetic Properties of a New Layered Quantum Spin System Ni5(TeO3)4X2 (X=Cl, Br),
M. Johnsson, et al., JCM 15, 68-73 (2003).

Manganites 

Orbital fluctuating state in ferromagnetic insulating LaMnO3+d  (0.085 < d < 0.125) studied using Raman spectroscopy, K.-Y. Choi, Yu. G. Pashkevich, V. P. Gnezdilov, G. Güntherodt, A. V. Yeremenko, D. A. Nabok, V. I. Kamenev, S. N. Barilo, S. V. Shiryaev, A. G. Soldatov, and P. Lemmens, Phys. Rev. B 74, 064406 (2006).

Orbiton-mediated multi-phonon scattering in La1-xSrxMnO3,
K.Y. Choi, P. Lemmens, G. Güntherodt, Yu. G. Pashkevich, V.P. Gnezdilov,
P. Reutler, L. Pinsard-Gaudart, B. Büchner, A. Revcolevschi,
Phys. Rev. B 72, 024301 (2005).

Existence of orbital polarons in ferromagnetic insulating La1-xSrxMnO3 (0.11<x<0.14) evidenced from giant phonon softening, K.Y. Choi, et al., PRB 71, 174402 (2005).

Phonon anomalies in lightly-doped manganites La1-xSrxMnO3 (x=0.09 and 0.11) near the CAF/FI phase boundary, K.-Y. Choi, et al., JMMM 272-276, E305 (2004).

Raman scattering study of Nd1-xSrxMnO3 (x=0.3, 0.5),
K.-Y. Choi, et al., JPCM 15, 3333 (2003).

Cuprates

Study of phase separation in La2CuO4+0.05 using Neutron and Raman scattering,
V.P. Gnezdilov, et al., Low Temp. Physics, (2005) in print.

Three-magnon light scattering observed in the coupled spin dimer system KCuCl3,
K.-Y. Choi, et al., PRB 72, 024451 (2005).

Inelastic light scattering experiments on the coupled spin dimmer system Tl1-xKxCuCl3,
K.-Y. Choi, et al., Progr. of Theor. Physics, (2005).

Charge density waves in Sr14-xCaxCu24O41: electronic correlations vs. structural effects,
K.Y. Choi, et al., submitted to PRB, (2005).

Interplay of structural and electronic phase separation in single crystalline La2CuO4 + 0.05 studied by Neutron and Raman scattering, V.P. Gnezdilov, et al., PRB 69, 17458 (2004).

Coexistence of dimerization and long-range magnetic ordering in the double chain spin system LiCu2O2: an inelastic light scattering study,
K.-Y. Choi, et al., PRB 69, 104421 (2004).

Spin dynamics of the spin dimer system TlCuCl3 probed by Raman spectroscopy,
K.-Y. Choi, et al., PRB 68, 174412 (2003).

Strong anharmonicity and spin-phonon coupling in the quasi-two-dimensional quantum spin system SrCu2(BO3)2,
K.-Y. Choi, et al., PRB 68, 104418 (2003).

Ultrasonic attenuation on the Bose-Einstein transition in TlCuCl3,
E.Ya. Sherman, et al., Phys. Rev. Lett. 91, 057201 (2003).

 

 

Forschungsberichte und andere Schriften / Research Reports

 

 

Webpages of Peter Lemmens

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p.lemmens at tu-bs.de, letzte Änderung: 23.02.2007