Ana Akrap

Cette personne n’est plus à l’EPFL

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (38)

Persistent antiferromagnetic order in heavily overdoped Ca1-xLaxFeAs2

László Forró, Henrik Moodysson Rønnow, Ivica Zivkovic, Ana Akrap, Philip Johannes Walter Moll, Sergiy Katrych, Edoardo Martino, Maja Deborah Bachmann

In the Ca1-xLaxFeAs2 (1 1 2) family of pnictide superconductors, we have investigated a highly overdoped composition (x = 0.56), prepared by a high-pressure, high-temperature synthesis. Magnetic measurements show an antiferromagnetic transition at T-N = 12 ...

2019

Two-Dimensional Conical Dispersion in ZrTe5 Evidenced by Optical Spectroscopy

Helmuth Berger, Ana Akrap, Edoardo Martino

Zirconium pentatelluride was recently reported to be a 3D Dirac semimetal, with a single conical band, located at the center of the Brillouin zone. The cone's lack of protection by the lattice symmetry immediately sparked vast discussions about the size an ...

AMER PHYSICAL SOC2019

Nonuniform carrier density in Cd3As2 evidenced by optical spectroscopy

Ana Akrap, Edoardo Martino

2018

Electronic properties of incommensurately modulated novel and complex materials

László Forró, Oleg Yazyev, Alla Arakcheeva, Gabriel Albert Autes, Philip Johannes Walter Moll, Ana Akrap, Edoardo Martino, Sergiy Katrych

INT UNION CRYSTALLOGRAPHY2018

BiTeCl and BiTeBr: A comparative high-pressure optical study

Arnaud Magrez, Oleg Yazyev, Gabriel Albert Autes, Helmuth Berger, Philippe Bugnon, Ana Akrap

We here report a detailed high-pressure infrared transmission study of BiTeCl and BiTeBr. We follow the evolution of two band transitions: the optical excitation beta between two Rashba-split conduction bands, and the absorption. across the band gap. In th ...

Amer Physical Soc2017

Crystal Structure, Transport, and Magnetic Properties of an Ir6+ Compound Ba8Al2IrO14

László Forró, Henrik Moodysson Rønnow, Arnaud Magrez, Alla Arakcheeva, Lin Yang, Ana Akrap, Krunoslav Prsa, Sergiy Katrych, Bastien Dalla Piazza, Andrea Pisoni

The novel iridate Ba8Al2IrO14 was prepared as single crystals by self-flux method, thereby providing a rare example of an all-Ir(VI) compound that can be synthesized under ambient pressure conditions. The preparation of all-Ir6+ iridate without using tradi ...

2015

Optical properties of BiTeBr and BiTeCl

Helmuth Berger, Arnaud Magrez, Philippe Bugnon, Ana Akrap, Dirk Van der Marel

We present a comparative study of the optical properties-reflectance, transmission, and optical conductivity- and Raman spectra of two layered bismuth-tellurohalides BiTeBr and BiTeCl at 300 and 5 K, for light polarized in the a-b planes. Despite different ...

Amer Physical Soc2014

Infrared- and Raman-Spectroscopy Measurements of a Transition in the Crystal Structure and a Closing of the Energy Gap of BiTeI under Pressure

Oleg Yazyev, Ana Akrap, Gabriel Albert Autes, Dirk Van der Marel

BiTeI is a giant Rashba spin splitting system, in which a noncentrosymmetric topological phase has recently been suggested to appear under high pressure. We investigated the optical properties of this compound, reflectivity and transmission, under pressure ...

American Physical Society2014

Enhanced low-temperature thermoelectrical properties of BiTeCl grown by topotactic method

László Forró, Arnaud Magrez, Richard Gaal, Helmuth Berger, Andrea Pisoni, Philippe Bugnon, Sergiy Katrych, Ana Akrap, Jacim Jacimovic, Xavier François Mettan

We developed a topotactic strategy to grow BiTeCl single crystals. Structural characterization by means of X-ray diffraction was performed, and the high crystallinity of the material was proven. Measurements of the thermoelectrical coefficients electrical ...

Pergamon-Elsevier Science Ltd2014

Bi2Te3-xSex series studied by resistivity and thermopower

László Forró, Ana Akrap

We study the detailed temperature and composition dependence of the resistivity, rho(T), and thermopower, S(T), for a series of layered bismuth chalcogenides Bi2Te3-xSex, and report the stoichiometry dependence of the optical band gap. In the resistivity o ...

IOP Publishing - EPL Association2014

Page 2 sur 4

Infrared- and Raman-Spectroscopy Measurements of a Transition in the Crystal Structure and a Closing of the Energy Gap of BiTeI under Pressure

Oleg Yazyev, Ana Akrap, Gabriel Albert Autes, Dirk Van der Marel

American Physical Society2014