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Publications

2013

A quasistatic magnetic cloak
Jån Souc, Mykola Solovyov, Fedor Gömöry, Jordi Prat-Camps, Carles Navau, and Alvaro Sanchez
New J. Phys. 15, 053019
http://iopscience.iop.org/1367-2630/15/5/053019

Magnetic and transport currents in thin film superconductors of arbitrary shape within the London approximation
Guillem Via, Carles Navau, and Alvaro Sanchez
J. Appl. Phys. 113, 093905
http://jap.aip.org/resource/1/japiau/v113/i9/p093905_s1

Optimization of a superconducting linear levitation system using a soft ferromagnet
Sebastia Agramunt-Puig, Nuria Del-Valle, Carles Navau, and Alvaro Sanchez
Physica C 487, 11
http://www.sciencedirect.com/science/article/pii/S0921453413000166

Macroscopic Modeling of Magnetization and Levitation of Hard Type-II Superconductors: The Critical-State Model
Carles Navau, Nuria Del-Valle, and Alvaro Sanchez
IEEE Trans. Appl. Supercond. 231, 8201023
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6422361&contentType=Journals+%26+Magazines&sortType%3Dasc_p_Sequence%26filter%3DAND%28p_IS_Number%3A6412810%29
Invited Paper


2012

Magnetic energy harvesting and concentration at distance by transformation optics
Carles Navau, Jordi Prat-Camps, and Alvaro Sanchez
Phys. Rev. Lett. 109, 263903
http://prl.aps.org/abstract/PRL/v109/i26/e263903 
Highlighted as a Focus in Physics and also in PhysicsWorld, PHYS.ORG, and RSEF

Quantum Magnetomechanics with Levitating Superconducting Microspheres
O. Romero-Isart, L. Clemente, C. Navau, A. Sanchez, and J. I. Cirac
Phys. Rev. Lett. 109, 147205
http://prl.aps.org/abstract/PRL/v109/i14/e147205
Highlighted in Nature Physics News and Views

Experimental Realization of a Magnetic Cloak
Fedor Gömöry, Mykola Solovyov, Jån Ơouc, Carles Navau, Jordi Prat-Camps, and Alvaro Sanchez
Science 335, 1466
Abstract / Reprint / Full Text
Highlighted in Nature News and PhysicsWorld, and some Media

Transport critical-current density of superconducting films with hysteretic ferromagnetic dots
Nuria Del-Valle, Carles Navau, Alvaro Sanchez, and Rafael B. Dinner
AIP Advances 2, 022166
http://dx.doi.org/10.1063/1.4732314

Exact Analytical Demagnetizing Factors for Long Hollow Cylinders in Transverse Field
Jordi Prat-Camps, Carles Navau, Du-Xing Chen, and Alvaro Sanchez
IEEE MAGNETIC LETTERS 3, 0500104
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6217348&contentType=Journals+%26+Magazines&sortType%3Dasc_p_Sequence%26filter%3DAND%28p_IS_Number%3A6138603%29

Two-dimensional arrays of superconducting strips as dc magnetic metamaterials
Yasunori Mawatari, Carles Navau, and Alvaro Sanchez
Phys.Rev. B. 85, 134524
http://link.aps.org/doi/10.1103/PhysRevB.85.134524

Alternating-current susceptibility and critical-current density of melt-processed Gd–Ba–Cu–O–Ag single grains: effect of intrinsic edge pinning
D-X Chen, Y-H Shi, C Navau, A Sanchez and D A Cardwell
Supercond. Sci. Technol. 25, 014010
http://iopscience.iop.org/0953-2048/25/1/014010/

Shaping magnetic fields with soft ferromagnets: Application to levitation of superconductors
Nuria Del-Valle, Sebastia Agramunt-Puig, Carles Navau, and Alvaro Sanchez
J. Appl. Phys. 111, 013921
http://link.aip.org/link/JAPIAU/v111/i1/p013921/s1&Agg=doi

 

2011

Antimagnets: controlling magnetic fields with superconductor–metamaterial hybrids
Alvaro Sanchez, Carles Navau, Jordi Prat-Camps and Du-Xing Chen
New J. Phys. 13, 093034
http://iopscience.iop.org/1367-2630/13/9/093034/  
Highlighted in Science NOW and PhysicsWorld, and some Media


Waiting time dependence of T2 of protons in water suspensions of iron-oxide nanoparticles: Measurements and simulations
D.-X. Chen, G. Via, F.-J. Xu, C. Navau, A. Sanchez, H.-C. Gu, J. S. Andreu, C. Calero, J. Camacho, and J. Faraudo
J. Appl. Phys. 110, 073917
http://jap.aip.org/resource/1/japiau/v110/i7/p073917_s1

Experimental and Theoretical Levitation Forces in a Superconducting Bearing for a Real-Scale Maglev System
Guilherme Goncalves Sotelo, Daniel Henrique N. Dias, Rubens de Andrade, Jr., Richard Magdalena Stephan, Nuria Del-Valle, Alvaro Sanchez, Carles Navau, and Du-Xing Chen
IEEE Trans. Appl. Supercond. 21, 3532
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5959955

Perpendicular ac susceptibility and critical current density of distant superconducting twin films
D-X Chen, G Via, C Navau N Del-Valle, A Sanchez, S-S Wang, V Rouco, A Palau and T Puig
Supercond. Sci. Technol. 24, 075004
http://iopscience.iop.org/0953-2048/24/7/075004/

Towards an Optimized Magnet-Superconductor Configuration in Actual Maglev Devices
Nuria Del-Valle, Alvaro Sanchez, Carles Navau, and Du-Xing Chen
IEEE Trans. Appl. Supercond. 21, 1469
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5635354

Tunability of the critical-current density in superconductor-ferromagnet hybrids
Nuria Del-Valle, Carles Navau, Alvaro Sanchez and Du-Xing Chen
Appl. Phys. Lett. 98, 202506
http://apl.aip.org/resource/1/applab/v98/i20/p202506_s1

Demagnetizing effects in granular hard magnetic bodies
C. Navau, D.-X. Chen, A. Sanchez, and N. Del-Valle
J. Appl. Phys. 109, 093901
http://jap.aip.org/resource/1/japiau/v109/i9/p093901_s1

Magnet Guideways for Superconducting Maglevs: Comparison Between Halbach-Type and Conventional Arrangements of Permanent Magnets
Nuria Del-Valle, Alvaro Sanchez, Carles Navau and Du-Xing Chen
J. Low Temp. Phys. 162, 62-71
http://www.springerlink.com/content/r25870511863x454/

Microscopic picture of the critical state in a superconductor with a periodic array of antidots
A. V. Silhanek, J. Gutierrez, R. B. G. Kramer, G. W. Ataklti, J. Van de Vondel, V. V. Moshchalkov, and A. Sanchez
Phys. Rev. B  83, 024509
http://link.aps.org/doi/10.1103/PhysRevB.83.024509

 

2010

Size analysis and magnetic structure of nickel nanoparticles
D.-X. Chen, O. Pascu, A. Roig, and A. Sanchez
J. Magn. Magn. Mater. 322, 3834
http://www.sciencedirect.com/science/article/pii/S0304885310005251

Influence of dipolar interactions on hyperthermia properties of ferromagnetic particles
D. Serantes, D. BaldomirC. Martinez-Boubeta, K. Simeonidis, M. Angelakeris, E. Natividad, M. Castro, A. Mediano, D.-X. Chen, A. Sanchez, LI. Balcells, and B. MartĂ­nez
J. Appl. Phys. 108, 073918
http://jap.aip.org/resource/1/japiau/v108/i7/p073918_s1

Influence of magnetic substrate in the transport critical current of superconducting tapes
Alvaro Sanchez, Nuria Del-Valle, Carles Navau, and Du-Xing Chen
Appl. Phys. Lett. 97, 072504
http://apl.aip.org/resource/1/applab/v97/i7/p072504_s1

Numerical calculations of the driving force on an Abrikosov vortex
D.-X. Chen, E. Pardo, and A. Sanchez
Physica C 470, 444
http://www.sciencedirect.com/science/article/pii/S0921453410002170

Axial and radial ac susceptibility measurements on melt-processed single-grain Y–Ba–Cu–O discs
D-X Chen, A Sanchez, C Navau, Y-H Shi, and D A Cardwell
Supercond. Sci. Technol. 23, 045010
http://iopscience.iop.org/0953-2048/23/4/045010/

Self-fields in thin superconducting tapes: Implications for the thickness effect in coated conductors
Alvaro Sanchez, Carles Navau, Nuria Del-Valle, Du-Xing Chen, and John R. Clem
Appl. Phys. Lett. 96, 072510
http://apl.aip.org/resource/1/applab/v96/i7/p072510_s1

Analytic expressions for critical-state ac susceptibility of rectangular superconducting films in perpendicular magnetic field
D.-X. Chen, C. Navau, N. Del-Valle, and A. Sanchez
Physica C 470, 89
http://www.sciencedirect.com/science/article/pii/S092145340900570X

 

2009

Analytic expressions for critical-state ac susceptibility of rectangular superconducting films in perpendicular magnetic field
D.-X. Chen, C. Navau, N. Del-Valle, A. Sanchez
Physica C 470, 89
http://www.sciencedirect.com/science/article/pii/S092145340900118X

Theoretical Hints for Optimizing Force and Stability in Actual Maglev Devices
Nuria Del-Valle, Alvaro Sanchez, Carles Navau, and Du-Xing Chen
IEEE Trans. Appl. Supercond. 19, 2070
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5067201&tag=1

Magnetic properties of a dc metamaterial consisting of parallel square superconducting thin plates
Carles Navau, Du-Xing Chen, Alvaro Sanchez, and Nuria Del-Valle
Appl. Phys. Lett. 94, 242501
http://apl.aip.org/resource/1/applab/v94/i24/p242501_s1

Critical-current density analysis of force and stability in maglev systems
Alvaro Sanchez, Nuria Del-Valle, Carles Navau, and Du-Xing Chen
J. Appl. Phys. 105, 023906
http://jap.aip.org/resource/1/japiau/v105/i2/p023906_s1

Size determination of superparamagnetic nanoparticles from magnetization curve
D.-X. Chen, A. Sanchez, E. Taboada, A. Roig, N. Sun, and H.-C. Gu
J. Appl. Phys. 105, 083924
http://jap.aip.org/resource/1/japiau/v105/i8/p083924_s1

 

2008

A theoretical study of the influence of superconductor and magnet dimensions on the levitation force and stability of maglev systems
Nuria Del-Valle, Alvaro Sanchez, Carles Navau, and Du-Xing Chen
Supercond. Sci. Technol. 21,125008
http://iopscience.iop.org/0953-2048/21/12/125008

Size-independent residual magnetic moments of colloidal Fe3O4-polystyrene nanospheres detected by ac susceptibility measurements
Du-Xing Chen, Alvaro Sanchez, Hong Xu, Hongchen Gu, and Donglu Shi
J. Appl. Phys. 104, 093902
http://jap.aip.org/resource/1/japiau/v104/i9/p093902_s1

Effective penetration depths of a thin type-II superconducting strip
D-X Chen, C Navau, N Del-Valle, and A Sanchez
Supercond. Sci. Technol. 21, 105010
http://iopscience.iop.org/0953-2048/21/10/105010?fromSearchPage=true

Critical-current density of melt-grown single-grain Y–Ba–Cu–O disks determined by ac susceptibility measurements
D-X Chen, A Sanchez, C Navau, Y-H Shi, and D A Cardwell
Supercond. Sci. Technol. 21, 085013
http://iopscience.iop.org/0953-2048/21/8/085013?fromSearchPage=true

Alternating current susceptibility calculations for thin-film superconductors with regions of different critical-current densities
C. Navau, A. Sanchez, N. Del-Valle, and D.-X. Chen
J. Appl. Phys. 103, 113907
http://jap.aip.org/resource/1/japiau/v103/i11/p113907_s1

Perpendicular critical-state susceptibility of square superconducting films
D.-X. Chen, C. Navau, N. Del-Valle, and A. Sanchez
Appl. Phys. Lett. 92, 202503
http://apl.aip.org/resource/1/applab/v92/i20/p202503_s1

Lateral-displacement influence on the levitation force in a superconducting system with translational symmetry
Nuria Del-Valle, Alvaro Sanchez, Carles Navau, and Du-Xing Chen
Appl. Phys. Lett. 92, 042505
http://apl.aip.org/resource/1/applab/v92/i4/p042505_s1

 

2007

Artificial magnetic granularity effects on patterned epitaxial YBa2Cu3O7-x thin films
E. Bartolomé, A. Palau, J. Gutiérrez, X. Granados, A. Pomar, T. Puig, X. Obradors, V. Cambel, J. Soltys, D. Gregusova, D. X. Chen, and A. Sånchez
Phys. Rev. B 76, 094508
http://prb.aps.org/abstract/PRB/v76/i9/e094508

AC susceptibility of half–half jointed melt-textured YBCO rings
D.-X. Chen, E. Bartolome, E. Pardo, A. Sanchez, B. Bozzo, X. Granados, T. Puig, X. Obradors, and H. Claus
Physica C 460–462, 770
http://www.sciencedirect.com/science/article/pii/S0921453407002572

Ac susceptibility of bicrystal-like type-II superconducting films
C. Navaua, E. Bartolomé, N. del Valle, D.-X. Chen, E. Pardo, A. Sånchez, T. Puig, and X. Obradors
Physica C 460–462, 787
http://www.sciencedirect.com/science/article/pii/S0921453407005515

Enhanced stability by field cooling in superconducting levitation with translational symmetry
Nuria Del Valle, Alvaro Sanchez, Enric Pardo, Carles Navau, and Du-Xing Chen
Appl. Phys. Lett. 91, 112507
http://apl.aip.org/resource/1/applab/v91/i11/p112507_s1

Imaging Current Percolation and Ac Losses in Artificially Granular YBCO Thin Films
E. Bartolomé, C. Navau, A. Sånchez, D.-X. Chen, T. Puig, X. Obradors, and V. Cambel
IEEE Trans. Appl. Supercond. 17, 3223
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4278049&tag=1

ac susceptibility of a melt-textured YBa2Cu3Ox ring closed by a strong-coupling contact
D.-X. Chen, E. Pardo, and A. Sanchez
Appl. Phys. Lett. 91, 012506
http://apl.aip.org/resource/1/applab/v91/i1/p012506_s1

Field dependent alternating current susceptibility of metalorganically deposited YBa2Cu3O7−ή films
D.-X. Chen, E. Pardo, A. Sanchez, M. N. Iliev, S.-S. Wang, and Z.-H. Han
J. Appl. Phys. 101, 073905
http://jap.aip.org/resource/1/japiau/v101/i7/p073905_s1

Forces acting on a current-driven moving vortex in a long Josephson junction
D.-X. Chen, E. Pardo, and A. Sanchez
Appl. Phys. Lett. 90, 142512
http://apl.aip.org/resource/1/applab/v90/i14/p142512_s1

Magnetic properties of a melt-textured YBa2Cu3Ox ring with a perpendicular crack
D.-X. Chen, E. Pardo, A. Sanchez, E. Bartolomé, T. Puig, and X. Obradors
Appl. Phys. Lett. 90, 072501
http://apl.aip.org/resource/1/applab/v90/i7/p072501_s1

Optimizing levitation force and stability in superconducting levitation with translational symmetry
Nuria Del Valle, Alvaro Sanchez, Enric Pardo, Du-Xing Chen, and Carles Navau
Appl. Phys. Lett. 90, 042503
http://apl.aip.org/resource/1/applab/v90/i4/p042503_s1

 

2006

Fluxmetric and magnetometric demagnetizing factors for cylinders
D.-X. Chen, E. Pardo, and A. Sanchez
J. Mag. Mag. Mat. 306, 135
http://www.sciencedirect.com/science/article/pii/S0304885306005804

ac susceptibility and critical-current densities in sintered YBa2Cu3O7−ή superconductors
D.-X. Chen, E. Pardo, A. Sanchez, and E. Bartolomé
Appl. Phys. Lett. 89, 072501
http://apl.aip.org/resource/1/applab/v89/i7/p072501_s1

Magnetic levitation of superconducting bars
Alvaro Sanchez, Nuria Del Valle, Enric Pardo, Du-Xing Chen, and Carles Navau
J. Appl. Phys. 99, 113904
http://jap.aip.org/resource/1/japiau/v99/i11/p113904_s1

Predicting AC loss in practical superconductors
F Gömöry, J Ć ouc, M Vojenčiak, E Seiler, B Klinčok, J M Ceballos, E Pardo, A Sanchez, C Navau, S Farinon, and P Fabbricatore
Supercond. Sci. Technol. 19, S60
http://iopscience.iop.org/0953-2048/19/3/009