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Continuous magnetic phase transition in artificial square ice

Sendetskyi, Oles ; Scagnoli, Valerio ; Leo, Naëmi ; Anghinolfi, Luca ; Alberca, Aurora ; Lüning, Jan ; Staub, Urs ; Derlet, Peter Michael ; Heyderman, Laura Jane

In: Physical Review B, 2019, vol. 99, no. 21, p. 214430

Critical behavior is very common in many fields of science and a wide variety of many- body systems exhibit emergent critical phenomena. The beauty of critical phase transitions lies in their scale-free properties, such that the temperature dependence of physical parameters of systems differing at the microscopic scale can be described by the same generic power laws. In this work we establish...

Dynamic pathway of the photoinduced phase transition of ${\mathrm{TbMnO}}_{3}$

Bothschafter, Elisabeth M. ; Abreu, Elsa ; Rettig, Laurenz ; Kubacka, Teresa ; Parchenko, Sergii ; Porer, Michael ; Dornes, Christian ; Windsor, Yoav William ; Ramakrishnan, Mahesh ; Alberca, Aurora ; Manz, Sebastian ; Saari, Jonathan ; Koohpayeh, Seyed M. ; Fiebig, Manfred ; Forrest, Thomas ; Werner, Philipp ; Dhesi, Sarnjeet S. ; Johnson, Steven L. ; Staub, Urs

In: Physical Review B, 2017, vol. 96, no. 18, p. 184414

Superconductivity and charge-carrier localization in ultrathin ${\mathrm{La}}_{1.85}{\mathrm{Sr}}_{0.15}{\mathrm{CuO}}_{4}/{\mathrm{La}}_{2}{\mathrm{CuO}}_{4}$ bilayers

Sen, Kaushik ; Maršík, Premysl ; Das, Saikat ; Perret, E. ; Andres Prada, R. de ; Alberca, Aurora ; Biškup, N. ; Varela, M. ; Bernhard, Christian

In: Physical Review B, 2017, vol. 95, no. 21, p. 214506

La1.85Sr0.15CuO4/La2CuO4 (LSCO15/LCO) bilayers with a precisely controlled thickness of N unit cells (UCs) of the former and M UCs of the latter ([LSCO15_N/LCO_M]) were grown on (001)-oriented SrLaAlO4 (SLAO) substrates with pulsed laser deposition (PLD). X-ray diffraction and reciprocal space map (RSM) studies confirmed the epitaxial growth of the bilayers and showed that a [LSCO15_2/LCO_2]...

Magnetic properties of strained multiferroic $\mathrm{CoC}{\mathrm{r}}_{2}{\mathrm{O}}_{4}$: A soft x-ray study

Windsor, Y. W. ; Piamonteze, C. ; Ramakrishnan, M. ; Scaramucci, A. ; Rettig, L. ; Huever, J. A. ; Bothschafter, E. M. ; Bingham, N. S. ; Alberca, Aurora ; Avula, S. R. V. ; Noheda, B. ; Staub, U.

In: Physical Review B, 2017, vol. 95, no. 22, p. 224413

Using resonant soft x-ray techniques we follow the magnetic behavior of a strained epitaxial film of CoCr2O4, a type-II multiferroic. The film is [110] oriented, such that both the ferroelectric and ferromagnetic moments can coexist in-plane. X-ray magnetic circular dichroism (XMCD) is used in scattering and in transmission modes to probe the magnetization of Co and Cr separately. The...

Crystal symmetry lowering in chiral multiferroic ${\mathrm{Ba}}_{3}{\mathrm{TaFe}}_{3}{\mathrm{Si}}_{2}{\mathrm{O}}_{14}$ observed by x-ray magnetic scattering

Ramakrishnan, M. ; Joly, Y. ; Windsor, Y. W. ; Rettig, L. ; Alberca, Aurora ; Bothschafter, E. M. ; Lejay, P. ; Ballou, R. ; Simonet, V. ; Scagnoli, V. ; Staub, U.

In: Physical Review B, 2017, vol. 95, no. 20, p. 205145

Chiral multiferroic langasites have attracted attention due to their doubly chiral magnetic ground state within an enantiomorphic crystal. We report on a detailed resonant soft x-ray diffraction study of the multiferroic Ba3TaFe3Si2O14 at the Fe L2,3 and oxygen K edges. Below TN (≈27K) we observe the satellite reflections (0,0,τ), (0,0,2τ), (0,0,3τ), and (0,0,1−3τ) where...

X-ray absorption study of the ferromagnetic Cu moment at the ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}/{\mathrm{La}}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}$ interface and variation of its exchange interaction with the Mn moment

Sen, Kaushik ; Perret, Edith ; Alberca, Aurora ; Uribe-Laverde, Miguel Angel ; Marozau, Ivan ; Yazdi-Rizi, M. ; Mallett, Benjamin P. P. ; Maršík, Premysl ; Piamonteze, C. ; Khaydukov, Yu N. ; Döbeli, Max ; Keller, T. ; Biškup, N. ; Varela, M. ; Vašátko, J. ; Munzar, Dominik ; Bernhard, Christian

In: Physical Review B, 2016, vol. 93, no. 20, p. 205131

With x-ray absorption spectroscopy and polarized neutron reflectometry we studied how the magnetic proximity effect at the interface between the cuprate high-TC superconductor YBa2Cu3O7 (YBCO) and the ferromagnet La2/3Ca1/3MnO3 (LCMO) is related to the electronic and magnetic properties of the LCMO layers. In particular, we explored how the magnitude of the ferromagnetic Cu moment on the YBCO...

Element-specific magnetization redistribution at ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}/{\mathrm{La}}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}$ interfaces

Alberca, Aurora ; Uribe-Laverde, Miguel Angel ; Windsor, Y. W. ; Ramakrishnan, M. ; Rettig, L. ; Marozau, Ivan ; Tonnerre, J-M. ; Stahn, J. ; Staub, U. ; Bernhard, Christian

In: Physical Review B, 2015, vol. 92, no. 17, p. 174415

We study the element-specific magnetic depth profiles of a YBa2Cu3O7/La2/3Ca1/3MnO3 (YBCO/LCMO) superlattice using soft x-ray resonant magnetic reflectometry (XRMR). This allows us to study the magnetic proximity effect (MPE) that is observed at the YBCO/LCMO interface, characterized by the occurrence of a depleted layer on the manganite side and an induced magnetization in the YBCO. Using the...