•  2017

Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba_1−xK_xFe₂As₂

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/La_2/3Ca_1/3MnO₃ 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 Ba_1-xK_xFe₂As₂

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 Ba_1-xK_xFe₂As₂

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(Fe_1-xCo_x)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 La_0.7Sr_0.3MnO₃ 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 T_c 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 La_1.85Sr_0.15CuO₄ /La_0.67Ca_0.33MnO₃ 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 YBa₂Cu₃O_6+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 La_1.85Sr_0.15CuO₄/La_2/3Ca_1/3MnO₃ 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/La_2/3Ca_1/3MnO₃ and La_2−xSr_xCuO₄/La_2/3Ca_1/3MnO₃ 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 YBa₂Cu₃O_7-x/LaMnO_3+d/YBa₂Cu₃O_7-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(Fe_1-xCo_x)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/La_2/3Ca_1/3MnO₃ 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(Fe_1-xCo_x)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 K_0.73Fe_1.67Se₂ 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 (T_c, H_c2, and H_irr) of Fe_xSe_1/2Te_1/2 (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/La_2/3Ca_1/3MnO₃ and YBa₂Cu₃O₇/LaMnO_3+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/La_0.67Ca_0.33MnO₃ superlattices on NdGaO₃ and Sr_0.7La_0.3Al_0.65Ta_0.35O₃ 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 RBa₂Cu₃O_7-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 BaFe_1.87Co_0.13As₂ 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 BaFe_1.89Co_0.11As₂

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 / La_2/3Ca_1/3MnO₃ 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 YBa₂Cu₃O_6.6

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)