Publications Magnetism & Supraconductivity group

 

•  2017

Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba1−xKxFe2As2

 

B. P. P. Mallett, C. N. Wang, P. Marsik, E. Sheveleva, M. Yazdi-Rizi, J. L. Tallon, P. Adelmann, Th. Wolf, and C. Bernhard

 

Physical Review B 95, 054512 (2017)

         

 

•  2016

Granular superconductivity and magnetic-field-driven recovery of macroscopic coherence in a cuprate/manganite multilayer in a γ-Al2O3/SrTiO3 heterostructure

 

B.P.P. Mallett, J. Khmaladze, E. Perret, A. Cerreta, M. Orlita, N. Biskup, M. Varela, C. Bernhard, P. Marsik

 

Physical Review B 94, 180503(R) (2016)

X-ray absorption study of the ferromagnetic Cu moment at the YBa2Cu3O7/La2/3Ca1/3MnO3 interface and the variation of its exchange interaction with the Mn moment in a γ-Al2O3/SrTiO3 heterostructure

 

K. Sen, E. Perret, A. Alberca, M.A. Uribe-Laverde, I. Marozau, M. Yazdi-Rizi, B.P.P. Mallett, P. Marsik, C. Piamonteze, Y. Khaydukov, M. Döbeli, T. Keller, J. Vašátko, D. Munzar, C. Bernhard

 

Physical Review B 93, 205131 (2016)

Two-dimensional excitonic quasiparticles in a three-dimensional crystal: The case of anatase TiO2

 

E. Baldini, L. Chiodo, A. Dominguez, M. Palummo, S. Moser, M. Yazdi, G. Auböck, B.P.P. Mallett, H. Berger, A. Magrez, C. Bernhard, M. Grioni, A. Rubio, and M. Chergui

 

arXiv:1601.01244 (2016)

 

 

•  2015

Infrared ellipsometry study of the confined electrons in a γ-Al2O3/SrTiO3 heterostructure

 

M. Yazdi-Rizi, P. Marsik, B.P.P. Mallett, A. Dubroka, D.V. Christensen, Y.Z. Chen, N. Pryds, and C. Bernhard

 

arXiv1512.06008 (2015)

Terahertz  ellipsometry study of the soft mode behavior in ultrathin SrTiO3 films

 

P. Marsik, K. Sen, J. Khmaladze, M. Yazdi-Rizi, B.P.P. Mallett, and C. Bernhard

 

arXiv1511.04521 (2015)

Magnetic-field-induced insulator-to-superconductor quantum phase transition in a manganite/cuprate multilayer

 

B.P.P. Mallett, J. Khmaladze, E. Perret, A. Cerreta, M. Orlita, N. Biskup, M. Varela, C. Bernhard, P. Marsik

 

arXiv:1512.03263 (2015)

Real-time observation of preformed pairs above the critical temperature in a cuprate superconductor

 

E. Baldini, A. Mann, B.P.P. Mallett, C. Arrell, F. van Mourik, T. Wolf, D. Mihailovic, J.L. Tallon, C. Bernhard, J. Lorenzana, and F. Carbone

 

arXiv:1510.00305 (2015)

Element specific magnetization redistribution at YBa2Cu3O7/La2/3Ca1/3MnO3 interfaces

 

A. Alberca, M.A. Uribe-Laverde, Y.W. Windsor, M. Ramakrishnan,  L. Rettig, I. Marozau, J-M. Tonnerre, J. Stahn, U. Staub, and C. Bernhard

 

Phys. Rev. B 92, 174415 (2015)

Muon-spin-rotation study of the magnetic structure in the tetragonal antiferromagnetic state of weakly underdoped Ba1-xKxFe2As2

 

B.P.P. Mallett, J. Pashkevic, A. Gusev, Th.Wolf, and C. Bernhard

 

EPL 111, 57001 (2015)

Infrared study of the spin reorientation transition and its reversal in the superconducting state in underdoped Ba1-xKxFe2As2

 

B.P.P. Mallett, P. Marsik, M. Yazdi-Rizi, Th. Wolf, A.E. Böhmer, F. Hardy, C. Meingast, D. Munzar, and C. Bernhard

 

Phys. Rev. Lett. 115, 027003 (2015)

Competing superconducting and magnetic order parameters and field-induced magnetism in electron-doped Ba(Fe1-xCox)2As2

 

J. Larsen, B.M. Uranga, G. Stieper, S.L. Holm, C. Bernhard, T. Wolf, K. Lefmann, B.M. Anderson, and C. Niedermayer

 

Phys. Rev. B 91, 024504 (2015)

Effect of combined addition of graphene oxide and citric acid on superconducting properties of MgB2

 

Sudesh, S. Das, C. Bernhard, and G.D. Varma

 

Physica C 509, 49 (2015)

Manupulating magnetism in La0.7Sr0.3MnO3 via piezostrain

 

J. Heidler, C. Piamonteze, R.V. Chopdekar, M.A. Uribe-Laverde, A. Alberca, N. Buzzi, B. Delley, C. Bernhard, and F. Nolting

 

Phys. Rev. B 91, 024406 (2015)

Evidence for precursor superconducting pairing above Tc in underdoped cuprates from an analysis of the in-plane infrared response

 

B. Sopjik, J. Chaloupka, C. Bernhard, and D. Munzar

 

New. J. Phys. 17, 053022 (2015)

Atomic resolution studies of epitaxial strain release mechanisms in La1.85Sr0.15CuO4 /La0.67Ca0.33MnO3 superlattices

 

N. Biskup, S. Das, J.M. Gonzalez Calbet, C. Bernhard, and M. Varela

 

Phys. Rev. B 91, 205132 (2015)

 

 

•  2014

Controlling the near-surface superfluid density in underdoped YBa2Cu3O6+x by photo-illumination

 

E. Stilp, A. Suter, T. Prokscha, Z. Salman, E. Morenzoni, H. Keller, P. Pahlke, R. Hühne, C. Bernhard, J. C. Baglo, Ruixing Liang, W. N. Hardy, D. A. Bonn, and R. F. Kiefl

 

Sci. Reports 4, 6250 (2014)

Study of the superconducting properties of ferrocene-added MgB2

 

Sudesh, S. Das, C. Bernhard, t. Shripathi and G.D. Varma

 

Physica Status Solidi A, 1-9 (2014)

Structural, magnetic and superconducting properties of pulsed-laser-deposition-grown La1.85Sr0.15CuO4/La2/3Ca1/3MnO3 superlattices on (001)-oriented SrLaAlO4 substrates

 

S. Das, K. Sen, I. Marozau, M.A. Uribe-Laverde, N. Biskup, M. Varela, Y. Khaydukov, O. Soltwedel, T. Keller, M. Döbeli, C.W. Schneider and C. Bernhard

 

Phys. Rev. B  89, 094511 (2014)

X-ray absorption spectroscopy study of the electronic and magnetic proximity effects in YBa2Cu3O7/La2/3Ca1/3MnO3 and La2−xSrxCuO4/La2/3Ca1/3MnO3 multilayers

 

M.A. Uribe-Laverde, S. Das, K. Sen, I. Marozau, E. Perret, A. Alberca, J. Heidler, C. Piamonteze, M. Merz, P. Nagel, S. Schuppler,  D. Munzar, C. Bernhard

 

Phys Rev. B 90 205135 (2014)

Enhanced superconducting properties of rare earth oxides and graphene oxide added MgB2

 

S. Sudesh, S. Das, C. Bernhard, and G.D. Varma

 

Physica C 505, 32 (2014)

 

 

 

 

•  2013

High bias anomaly in YBa2Cu3O7-x/LaMnO3+d/YBa2Cu3O7-x superconductor/ferromagnetic insulator/superconductor junctions: Evidence of a long-range superconducting proximity effect through the conduction band of a ferromagnetic insulator

 

T. Golod, A. Rydh, V.M. Kraznov, I. Marozau, M.A. Uribe-Laverde, D.K. Satapathy, Th. Wagner, and C. Bernhard

 

Phys. Rev. B 87, 134520 (2013)

Importance of spin-orbit interaction for the electron spin relaxation in organic superconductors

 

L. Nuccio, M. Willis, L. Schulz, S. Fratini, F. Messina, M. D'Amico, F.L. Pratt, J.S. Lord, I. Mckenzie, M. Loth, B. Purushothaman, J. Anthony, M. Heeney, R.M. Wilson, I. Hernández, M. Cannas, K. Sedlak, T. Kreouzis, W.P. Gillin, C. Bernhard and A.J. Drew

 

Phys. Rev. Lett. 110, 216602 (2013)

Effect of graphene oxide doping on superconducting properties of bulk MgB2

 

Sudesh, N. Kumar, S. Das, C. Bernhard and G.D. Varma

 

Supercond. Sci. Technol. 26, 095008 (2013)

Strain-induced ferromagnetism in antiferromagentic LuMnO3 thin films

 

J.S. White, M. Bator, Y. Hu, H. Luetkens, J. Stahn, S. Capelli, S. Das, M. Döbelli, th. Lippert, V.K. Malik, J. Martynczuk, A. Wokaun, M. Kenzelmann, Ch. Niedermayer and C.W. Schneider

 

Phys. Rev. Lett. 111, 037201 (2013)

Low-energy interband transitions in the infrared response of Ba(Fe1-xCox)As2

 

P. Marsik, C.N. Wang, M. Rössle, M. Yazdi-Rizi, R. Schuster, K.W. Kim, A. Dubroka, D. Munzar, T. Wolf, X.H. Chen and C. Bernhard

 

Phys. Rev. B 88, 180508 (2013)

Optical probe of ferroelectric order in bulk and thin-film perovskite titanates

 

M. Rössle, C.N. Wang, P. Marsik, M. Yazdi-Rizi, K.W. Kim, A. Dubroka, I. Marozau, C.W. Schneider, J. Humlícek, D. Baeriswyl and C. Bernhard

 

Phys. Rev. B 88, 104110 (2013)

Electric field induced polar order and localization of the confined electrons in LaAlO3/SrTiO3 heterostructures

 

M. Rössle, K.W. Kim, A. Dubroka, P. Marsik, C.N. Wang, R. Jany, C. Richter, J. Mannhart, C.W. Schneider, A. Fraño, P. Wichner, Y. Lu, B. Keimer, D.K. Shukla, J. Strempfer and C. Bernhard

 

Phys. Rev. Lett. 110, 136805 (2013)

Depth profile of the ferromagnetic order in a YBa2Cu3O7/La2/3Ca1/3MnO3 superlattice on a LSAT substrate: A polarized neutron reflectometry study

 

M.A. Uribe-Laverde, D.K. Satapathy, I. Marozau, V.K. Malik, S. Das, K. Sen, J. Stahn, A. Rühm, J.H. Kim, T. Keller, A. Devishvili, B.P. Toperverg and C. Bernhard

 

Phys. Rev. B 87, 115105 (2013)

Transient spin density wave order induced in the normal state of BaFe2As2 by coherent lattice oscillations

 

K.W. Kim, A. Pashkin, H. Schäfer, M. Beyer, M. Porer, T. Wolf, C. Bernhard, J. Demsar, R. Huber, and A. Leitenstorfer

 

EPJ Web of Conferences 41, 03012 (2013)

 

 

 

 

 

•  2012

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O12 garnet

 

T.D. Kang, E.C. Standard, P.D. Rogers, K.H. Ahn, A. Sirenko, A. Dubroka, C. Bernhard, S. Park, Y.J. Choi and S.W. Cheong

 

Phys. Rev. B 86, 144112 (2012)

Muon spin rotation study of magnetism and superconductivity in Ba(Fe1-xCox)2As2 single crystals

 

C. Bernhard, C.N. Wang, L. Nuccio, L. Schulz, O. Zaharko, J. Larsen, C. Aristizabal, M. Willis, A.J. Drew, G.D. Varma, T. Wolf and Ch. Niedermayer

 

Phys. Rev. B 86, 184509 (2012)

Spatially resolved strain-imprinted magnetic states in an artificial multiferroic

 

R.V. Chopdekar, V.K. Malik, A. Fraile Rodriguez, L. Le Guyader, Y. Takamura, A. Scholl, D. Stender, C.W. Schneider, C. Bernhard, F. Nolting and L.J. Heyderman

 

Phys. Rev. B 86, 014408 (2012)

Macrosocopic phase segregation in superconducting K0.73Fe1.67Se2 as seen by muon spin rotation and infrared spectroscopy

 

C. Wang, P. Marsik, R. Schuster, A. Dubroka, M. Rössle, Ch. Niedermayer, G.D. Varma, A.F. Wang, X.H. Chen, T. Wolf and C. Bernhard

 

Phys. Rev. B 85, 214503 (2012)

Ultrafast transient generation of spin density wave order in the normal state of BaFe2As2 driven by coherent lattice vibrations

 

K.W. Kim, A. Pashkin, H. Schäfer, M. Beyer, M. Porer, T. Wolf, C. Bernhard, J. Demsar, R. Huber and A. Leitenstorfer

 

Nature Materials 11, 497 (2012)

Effect of Fe composition on the superconducting properties (Tc, Hc2, and Hirr) of FexSe1/2Te1/2 (x=0.95, 1.00, 1.05 and 1.10)

 

S. Sudesh, S. Rani, S. Das, R. Rawat, C. Bernhard and G.D. Varma

 

J. Appl. Phys. 111, 07E119 (2012)

Magnetic proximity effect in YBa2Cu3O7/La2/3Ca1/3MnO3 and YBa2Cu3O7/LaMnO3+d superlattices

 

D.K. Satapathy, M.A. Uribe-Laverde, I. Marozau, V.K. Malik, S. Das, Th. Wagner, C. Marcelot, J. Stahn, S. Brück, A. Rühm, S. Macke, T. Tietze, E. Goering, A. Frañó, J.-H. Kim, M. Wu, E. Benckiser, B. Keimer, A. Devishvili, B.P. Toperverg, M. Merz, P. Nagel, S. Schuppler and C. Bernhard

 

Phys. Rev. Lett. 108, 197201 (2012)

Pulsed laser deposition growth of heteroepitaxial YBa2Cu3O7/La0.67Ca0.33MnO3 superlattices on NdGaO3 and Sr0.7La0.3Al0.65Ta0.35O3 substrates

 

V.K. Malik, I. Marozau, S. Das, B. Dogget, D.K. Satapathy, M.A. Uribe-Laverde, N. Biskup, M. Varela, C.W. Schneider, C. Marcelot, J. Stahn and C. Bernhard

 

Phys. Rev. B 85, 054514 (2012)

Magnetism, superconductivity and coupling in cuprate heteroestructures probed by low-energy muon-spin rotation

 

B.M. Wojek, E. Morenzoni, D.G. Eshchenko, A. Suter, T. Prokscha, H. Keller, O. Fischer, V.K. Malik, C. Bernhard and M.D. Tobelis

 

Phys. Rev. B 85, 024505 (2012)

 

 

 

 

2011

Dimensionality control of electronic phase transitions in Nickel-Oxide superlattices

 

A. V. Boris, Y. Matiks, E. Benckiser, A. Frano, P. Popovich, V. Hinkov, P. Wochner, M. Castro-Colin, E. Detemple, V. K. Malik, C. Bernhard, T. Prokscha, A. Suter, Z. Salman, E. Morenzoni, G. Cristiani, H.-U. Habermeier, B. Keimer

 

Science 332, 937 (2011)

Evidence of a precursor superconducting phase at temperatures as high as 180 K in RBa2Cu3O7-d (R=Y,Gd,Eu) superconducting crystals from infrared spectroscopy

 

A. Dubroka, M. Rössle, K.W. Kim, V. K. Malik, D. Munzar, D. N. Bazov, A. A. Schafgans, S. J. Moon, C. T. Lin, D. Haug, V. Hinkov, B. Keimer, Th. Wolf, J. G. Storey, J. L. Tallon, C. Bernhard

 

Phys. Rev. Lett. 106, 047006 (2011)

Engineering spin propagation across a hybrid organic/inorganic interface using a polar layer

 

L. Schulz, L. Nuccio, M. Willis, P. Desai, P. Shakya, T. Kreouzis, V. K. Malik, C. Bernhard, F. L. Pratt, N. A. Morley, A. Suter, G. J. Nieuwenhuys, T. Prokscha, E. Morenzoni, W. P. Gillin and A. J. Drew

 

 Nature Materials 10, 39–44 (2011) 

High temperature magnetic order in Zinc sulfide doped with copper

 

F.J. Owens, L. Gladczuk, K. Szymczak, P. Dluzekski, A. Wisniewski, H. Szymczak, A. Golnik, C. Bernhard, and C. Niedermayer

 

J. Phys. Chem. of Solids 72, 648 (2011)

Importance of intramolecular electron spin relaxation in small molecule semiconductors

 

L. Schulz, M. Willis, L. Nuccio, P. Susharov, S. Fratini, F.L. Pratt, W.P. Gillins, T. Kreuzis, M. Heeney, N. Stingelin, C.A. Stafford, D.J. Beeleys, C. Bernhard, J.E. Anthony, I. Mckenzie, J.S. Lord, and A.J. Drew

 

Phys. Rev. B 84, 085209 (2011)

Adjusted oscillator strength matching for hybrid magnetic and electric excitations in Dy3Fe5O12 garnet

 

P.D. Rogers, Y.J Choi, E. Standard, T.D. Kang, K.H. Ahn, A. Dubroka, P. Marsik, Ch. Wang, C. Bernhard, S. Park, S-W. Cheong, M. Kotelyanskii, and A.A. Sirenko.

 

Phys. Rev. B 83, 174407 (2011)

 

 

 

 

 

2010

The effect of Pr6O11 doping on superconducting properties of MgB2

 

N. Ojha, V.K. Malik, C. Bernhard and G.D. Varma

 

Phys. Stat. Sol. (a) 207, 175 (2010)

Evidence for multiple superconducting gaps in BaFe1.87Co0.13As2 from infrared spectroscopy

 

K.W. Kim, M. Rössle, A. Dubroka, V.K. Malik, T. Wolf and C. Bernhard

 

Phys. Rev. B 81, 214508 (2010)

Femtosecond quasiparticle and phonon dynamics in superconducting YBa2Cu3O7 studied by ultrabroadband terahertz spectroscopy

 

A. Pashkin, M. Porer, M. Beyer, J.J. Hees, K.W. Kim, A. Dubroka, C. Bernhard, X. Yaos, Y. Dagan, R. Hackl, A. Erb, J. Demsar, R. Huber, and A. Leitenstorfer

 

Phys. Rev. Lett. 105, 067001 (2010)

Coexistence and competition of magnetism and superconductivity on the nanometer scale in underdoped BaFe1.89Co0.11As2

 

P. Marsik, K.W. Kim, A. Dubroka, M. Rössle, V.K. Malik, L. Schulz, C.N. Wang, Ch. Niedermayer, A.J. Drew, M. Willis, T. Wolf and C. Bernhard

 

Phys. Rev. Lett. 105, 057001 (2010)

Pseudogap and precursor superconductivity in underdoped cuprate high temperature superconductors: a far-infrared ellipsometry study

 

A. Dubroka, D. Munzar, K.W. Kim, M. Rössle, V.K. Malik, C.T. Lin, B. Keimer, Th. Wolf and C. Bernhard

 

Eur. Phys. J. Special Topics 188, 73 (2010)

Elastic torsion effects in magnetic nanoparticle diblock-copolymer structures

 

L. Schulz, W. Schirmacher, A. Omran, V. R. Shah, P. Böni, W. Petry and P. Müller-Buschbaum

 

J. Phys.: Cond. Matter 22, 346008 (2010)

Polarized neutron reflectometry study of the magnetization reversal  process in YBa2Cu3O7 / La2/3Ca1/3MnO3 superlattices grown on SrTiO3  
substrates

 

J. Hoppler, H. Fritzsche, V. K. Malik, J. Stahn, G. Cristiani, H.-U. Habermeier, M. Rössle, J. Honolka, A. Enders, and  C. Bernhard

 

Phys. Rev. B 82, 174439 (2010)

Incommensurate magnetic order and dynamics induced by spinless impurities in YBa2Cu3O6.6

 

A. Suchaneck, V. Hinkov, D. Haug, L. Schulz, C. Bernhard, A. Ivanov, K. Hradil, C. T. Lin, P. Bourges, B. Keimer and Y. Sidis

 

Phys. Rev. Lett. 105, 037207 (2010)

Dynamical Response and confinement of the electrons at the LaAlO3/SrTiO3 interface

 

A Dubroka, M. Rössle, K.W. Kim, V.K. Malik, L. Schulz, S. Thiel, C.W. Schneider, J. Mannhart, G. Herranz, O. Copie, M. Bibes, A. Barthelemy and C. Bernhard

 

Phys. Rev. Lett. 104, 156807 (2010)

Two dimensional confinement of 3d electrons in LaTiO3/LaAlO3 multilayers

 

S.S.A. Seo, M.J. Han, G.W. Hassink, W.S. Choi, S.J. Moon, Y.S. Lee, S.J. Moon, Y.S. Lee, J. Yu, C. Bernhard, H.Y. Hwang, G. Rijnders, D.H.A. Blank, B. Keimer, and T.W. Noh

 

Phys. Rev. Lett. 104, 036401 (2010)

Spatially resolved investigation of solution cast colloidal films by x-ray scattering and multidimensional data set classification

 

S. V. Roth, A. Rothkirch, T. Autenrieth, T. Wroblewski, R. Gehrke, C. Riekel, M. C. Burghammer, L. Schulz, R. Hengstler, and P. Müller-Buschbaum

 

Langmuir 26, 1496-1500 (2010)