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Featured researches published by B. Ruzicka.


ELECTRONIC PROPERTIES OF NOVEL MATERIALS--SCIENCE AND TECHNOLOGY OF MOLECULAR NANOSTRUCTURES | 1999

Electronic properties of the

Natasa Čegar; F. Simon; G. Baumgartner; Andrzej Sienkiewicz; László Forró; B. Ruzicka; L. Degiorgi; L. Mihaly

Electron Spin Resonance(ESR) at ambient and under high pressure and optical reflectivity measurements were used to study the consecutive phase transitions in Na2AC60 family of fulleride compounds. The high temperature fcc phase in all three A=K,Rb,Cs compounds are found to show semi-metallic behavior. For the first time a peculiar sequence of phase transitions from semi-metallic to metallic to superconducting phases are observed in Na2CsC60. The metallic properties of the polymeric phases in A=K,Rb were established.


AIP Conference Proceedings | 2008

Electronic properties of the Na2AC60 family (A=K, Rb, Cs)

Natasa Čegar; F. Simon; G. Baumgartner; Andrzej Sienkiewicz; László Forró; B. Ruzicka; L. Degiorgi; L. Mihaly

Electron Spin Resonance(ESR) at ambient and under high pressure and optical reflectivity measurements were used to study the consecutive phase transitions in Na2AC60 family of fulleride compounds. The high temperature fcc phase in all three A=K,Rb,Cs compounds are found to show semi-metallic behavior. For the first time a peculiar sequence of phase transitions from semi-metallic to metallic to superconducting phases are observed in Na2CsC60. The metallic properties of the polymeric phases in A=K,Rb were established.


The 13th international winterschool on electronic properties of novel materials- science and technology of molecular nanostructures | 1999

Electronic properties of the Na2AC60family (A=K, Rb, Cs)

Natasa Čegar; F. Simon; G. Baumgartner; Andrzej Sienkiewicz; László Forró; B. Ruzicka; Leonardo Degiorgi; L. Mihaly

Electron Spin Resonance(ESR) at ambient and under high pressure and optical reflectivity measurements were used to study the consecutive phase transitions in Na2AC60 family of fulleride compounds. The high temperature fcc phase in all three A=K,Rb,Cs compounds are found to show semi-metallic behavior. For the first time a peculiar sequence of phase transitions from semi-metallic to metallic to superconducting phases are observed in Na2CsC60. The metallic properties of the polymeric phases in A=K,Rb were established.


Physica C-superconductivity and Its Applications | 1999

Optical properties of Sr14−xCaxCu24O41 and Sr0.73CuO2

B. Ruzicka; L. Degiorgi; G.I. Meijer; J. Karpinski; U. Ammerahl; G. Dhalenne; A. Revcolevschi

Abstract The optical reflectivity as a function of temperature of the title compounds has been measured over a broad spectral range from 4 meV up to 12 eV. On the one hand, our findings suggest a very anisotropic dynamics of the charge excitation spectrum when measuring along or perpendicular to the ladders in Sr 14− x Ca x Cu 24 O 41 . On the other hand, the investigation of Sr 0.73 CuO 2 allows us to study the electrodynamics of hole doped CuO 2 chains alone without complications arising from the presence of Cu 2 O 3 ladders in Sr 14− x Ca x Cu 24 O 41 .


Physical Review Letters | 2001

Charge Dynamics of 2H-TaSe2 along the Less-Conducting c-Axis

B. Ruzicka; L. Degiorgi; H. Berger; R. Gaál; L. Forró


arXiv: Strongly Correlated Electrons | 2008

Alkali specific effects in superconducting fullerides: the observation of a high temperature insulating phase in Na2CsC60

F. Simon; Slaven Garaj; B. Ruzicka; L. Degiorgi; V. Brouet


European Physical Journal B | 2003

Optical properties of the quasi-two-dimensional dichalcogenides 2H-TaSe <Emphasis Type=

S. V. Dordevic; D. N. Basov; Robert C. Dynes; B. Ruzicka; Verena Vescoli; L. Degiorgi; Helmuth Berger; R. Gaal; László Forró; Edith Bucher


Archive | 2001

Charge dynamics along the less conducting c-axis of the layered transition metal dichalcogenides

B. Ruzicka; Leonardo Degiorgi; H. Berger; R. Gaal; Laszlo Forro


Archive | 2000

Strong correlations in Na_2CsC_60: the observation of an insulating state

Natasa Čegar; F. Simon; Slaven Garaj; László Forró; B. Ruzicka; Leonardo Degiorgi; L. Mihaly


European Physical Journal B | 2000

Transport and optical conductivity in <img src="/fulltext-image.asp?format=htmlnonpaginated&src=VUB

B. Ruzicka; A. Brglez; Barry Malic; L. Degiorgi; Dragan Mihailovic

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László Forró

École Polytechnique Fédérale de Lausanne

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F. Simon

Budapest University of Technology and Economics

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Natasa Čegar

École Polytechnique Fédérale de Lausanne

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L. Mihaly

Stony Brook University

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G. Dhalenne

University of Paris-Sud

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Andrzej Sienkiewicz

École Polytechnique Fédérale de Lausanne

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G. Baumgartner

École Polytechnique Fédérale de Lausanne

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