Sergio O. Valenzuela

 


Publications

Talks

Conferences

Awards/Honors

CV(pdf)

 

 

 

 

 

 

 

 


Ph.D. 2001

University of Buenos Aires, Argentina

 

 

 

Publications

 

 


DIRECT ELECTRONIC MEASUREMENT OF THE SPIN HALL EFFECT

S.O. Valenzuela and M. Tinkham, Nature 442, 176 (2006).

 

spin polarized tunneling at finite bias

S.O. Valenzuela, D.J. Monsma, C.M. Marcus, V. Narayanamurti and M. Tinkham., Phys. Rev. Lett. 94, 196601 (2005).

 

Oscillatory dynamics of a superconductor vortex lattice in high-amplitude ac magnetic fields

A.J. Moreno, S.O. Valenzuela, G. Pasquini and V. Bekeris. Phys. Rev. B 71, 132513 (2005).

 

Spin polarized tunneling in room temperature spin valves

S.O. Valenzuela and M. Tinkham., Appl. Phys. Lett., 85 , 5914 (2004).

 

Mobility of solid vortex matter in "shaking" ac magnetic fields of variable amplitude

A.J. Moreno, S.O. Valenzuela, G. Pasquini and V. Bekeris., Physica C 408-410, 571 (2004). Proc. M2S-HTSC-VII (Rio de Janeiro, Brazil).

 

Pinning, mobility and memory effects in YBCO crystals

G. Pasquini, V. Bekeris, A. Moreno and S.O. Valenzuela., Physica C 408-410, 591 (2004). Proc. M2S-HTSC-VII (Rio de Janeiro, Brazil).

 

dc measurements of macroscopic quantum levels in a superconducting qubit structure with a time-ordered meter

D.S. Crankshaw, K. Segall, D. Nakada, T.P. Orlando, L.S. Levitov, S. Lloyd, S.O. Valenzuela, N. Marković, M. Tinkham, and K.K. Berggren., Phys. Rev. B 69, 144518 (2004).

 

IMPACT OF TIME-ORDERED MEASUREMENTS OF THE TWO STATES IN A NIOBIUM SUPERCONDUCING QUBIT STRUCTURE

K. Segall, D. Crankshaw, D. Nakada, T. P. Orlando, L. S. Levitov, S. Lloyd, N. Markovic, S. O. Valenzuela, M. Tinkham, and K. K. Berggren, Phys. Rev. B 67, 220506(Rapid Comm.) (2003).

 

experimental characterization of the two current states in a Nb persistent-current qubit

K. Segall, D. Crankshaw, D. Nakada, B. Singh, J. Lee, T. P. Orlando, K. K. Berggren, N. Markovic, S. O. Valenzuela, and  M. Tinkham, IEEE Trans. Appl. Supercon. 13, 1009 (2003).

 

Order and mobility of solid vortex matter in oscillatory driving currents

S.O. Valenzuela, Phys. Rev. Lett. 88, 247003 (2002).

 

ac susceptibility harmonic response in YBCO single crystals with different oxygen content

A.J. Moreno, S.O. Valenzuela and V. Bekeris, Physica C 377, 466 (2002).

 

History effects and pinning regimes in solid vortex matter

S.O. Valenzuela and V. Bekeris. Phys. Rev. B 65, 134513 (2002).

 

Plastic to elastic crossover below the peak effect in the vortex solid of YBa2Cu3O7 single crystals

S.O. Valenzuela, B. Maiorov, E. Osquiguil and V. Bekeris. Phys. Rev. B (Rapid Comm.) 65, 060504(R) (2002).

 

Oscillatory dynamics and organization of the vortex solid in YBa2Cu3O7 single crystals

S.O. Valenzuela and V. Bekeris. Phys. Rev. Lett. 86, 504 (2001).

 

Investigation of harmonic generation and hysteretic behavior in the response of YBaCuO single crystals in an external alternating magnetic field

S. O. Valenzuela and V. Bekeris.  Physica B 284-288, 1019 (2000). Proc. LT22 (Finlandia, 1999).

 

Flux Motion and Transport Currents in Type II Superconducting Strips with Inhomogeneous Pinning and Edge Barriers

S. O. Valenzuela, H. Ferrari and V. Bekeris. Physica B 284-288, 839 (2000). Proc. LT22 (Finlandia, 1999).

 

Magnetization in high temperature superconducting strips during transverse magnetic field application

H. Ferrari, S. O. Valenzuela, V. Bekeris and L. Correra. Physica B 284-288, 837 (2000). Proc. LT22 (Finlandia, 1999).

 

Plasticity and memory effects in the solid vortex phase of twinned YBa2Cu3O7 single crystals

S. O. Valenzuela and V. Bekeris.  Phys. Rev. Lett. 84, 4200 (2000).

 

History dependence in the ac susceptibility of YBaaCu3O7 single crystals

S. O. Valenzuela and V. Bekeris. Physica C 341-348, 1103 (2000). Proc. M2S-HTSC-VI (Houston, USA, 2000).

 

Measuring the interaction force between a high temperature superconductor and a permanent magnet

S. O. Valenzuela, G. Jorge and E, Rodríguez. Am. J. Phys. 67, 1001 (1999).

 

Ultra-short time local current density in superconducting strps: a new experimental approach

H. Ferrari, S. O. Valenzuela, V. Bekeris, V. A. Dediu and L. Correra.  Supercond. Sci. Technol. 12, 210 (1999).

 

Photoinduced chain fragment ordering in GdBa2Cu3Ox thin films

S. O. Valenzuela, A. Fainstein, P. Etchegoin, B. Maiorov, E. Osquiguil and J. Guimpel. Superficies y vacío 9, 135 (1999). Proc. "11th International Conference on Thin Films" (Cancún, México, 1999).

 

Non-conventional short-time dc-magnetometer for superconducting films

S. O. Valenzuela, H. Ferrari, V. Bekeris, M. C. Marconi, J. Guimpel and F. de la Cruz. Rev. Sci. Instrum. 69, 251 (1998).

 

Short-time magnetization in superconducting thin films

H. Ferrari, S. O. Valenzuela, V. Bekeris, J. Guimpel and F. de la Cruz. Rev. Mex. Fís. 44 S3, 193 (1998). Proc. S.L.A.F.E.S.(México, 1998)

 

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Invited talks

 


Physics Colloquium, University of Delaware. February 17th, 2005.

 

Condensed Matter and Applied Physics Colloquium, Harvard University. February 11th, 2005.

 

The Rowland Institute at Harvard University, Cambridge, MA. January 28th, 2005.

 

Physics Colloquium, Northeastern University, Boston, MA. January 20th, 2005.

 

Condensed Matter Seminar, The Johns Hopkins University, Baltimore, NY. November 17th, 2004

 

Physics and Astronomy Seminar, Colgate University, NY, USA. April 13th,  2004.

 

Oscillatory dynamics of the vortex solid in superconductors. CIRCS Seminar, Northeastern University, Boston, USA. January 14th, 2003.

 

Oscillatory dynamics and organization of solid vortex matter In high temperature superconductors. J.J. Giambiagi Prize talk. 87th Meeting of the Argentinean Physical Society (AFA), Huerta Grande, Argentina, September 16th, 2002.

 

Oscillatory dynamics of solid vortex matter in superconductors. VIII Vortex Physics Workshop, Bariloche, Argentina. November 26th-December 1st, 2001.

 

Oscillatory dynamics and organization of solid vortex matter. CEA Saclay, Service de Physique de l’Etat Condense (SPEC), Orme-des-Merisiers, France, November 8th, 2000.

 

Oscillatory dynamics and organization of solid vortex matter. CNRS, CRTBT, Grenoble, France, November 16th, 2000.

 

Superconducting vortices: Memory effects. Physics Dept., FCEyN, University of Buenos Aires. July 6th, 2000.

 

High temperature superconductors at the University of Buenos Aires. Current research. Colloquium for undergraduate students, Physics Dept., UBA, October, 1996.

 

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Participation in conferences

 


APS March Meeting 2003, Austin, USA (3 abstracts)

 

APS March Meeting 2002, Indianápolis, USA (1)

 

2002 Applied Superconductivity Conference, Houston (1)

 

APS March Meeting 2001 Seattle, USA (2)

 

VIII Vortex Physics Workshop 2001, Bariloche, Argentina (2)

 

M2S-HTSC-VI 2000, Houston, USA (2)

 

LT22 1999, Helsinski, Finlandia (3)

 

S.L.A.F.E.S. XII 1998, Oaxaca, México (1).

 

Anual meetings of the “Asociación Física Argentina” (AFA) (15)

 

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Awards and honors

 


J.J. Giambiagi Prize 2002, Prize for the best Ph.D. Thesis on Experimental Physics in Argentina (completed during 2000 and 2001).

 

University of Buenos Aires Scholarship for Graduates Students (1999-2001)

 

University of Buenos Aires Scholarship for Graduates Students (1997-1999)

 

Sauberán Research Scholarship (1996-1997)

 

Student Scholarship, University of Buenos Aires (1993-1996)

 

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