Mehdi Frachet
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View article: Impact of low-energy spin fluctuations on the strange metal in a cuprate superconductor
Impact of low-energy spin fluctuations on the strange metal in a cuprate superconductor Open
View article: Charge density waves and soft phonon evolution in the superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>BaNi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>As</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">P</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Charge density waves and soft phonon evolution in the superconductor Open
The superconductor BaNi2As2 exhibits a soft-phonon-driven, incommensurate charge density wave (I-CDW) which is accompanied by a small orthorhombic structural phase transition. Upon further cooling, BaNi2As2 undergoes a first-order structur…
View article: Impact of Ca substitution on competing orders in superconducting <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>BaNi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Impact of Ca substitution on competing orders in superconducting Open
BaNi2As2, a structural analog to the iron-based parent compound BaFe2As2, offers a unique platform to study the interplay between superconductivity, charge density waves, and, possibly, electronic nematicity. Here, we report on the growth …
View article: Chemical pressure tuning of competing orders in $\textrm{Ba}_{1-x}\textrm{Ca}_{x}\textrm{Ni}_{2}\textrm{As}_{2}$
Chemical pressure tuning of competing orders in $\textrm{Ba}_{1-x}\textrm{Ca}_{x}\textrm{Ni}_{2}\textrm{As}_{2}$ Open
$\mathrm{Ba}\mathrm{Ni}_{2}\mathrm{As}_{2}$, a structural-analogue to the iron-based parent compound $\mathrm{Ba}\mathrm{Fe}_{2}\mathrm{As}_{2}$, offers a unique platform to study the interplay between superconductivity, charge density wav…
View article: Anomalous phonon Grüneisen parameters in the semiconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ta</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>NiS</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>
Anomalous phonon Grüneisen parameters in the semiconductor Open
Strain tuning is a powerful experimental method in probing correlated\nelectron systems. Here we study the strain response of the lattice dynamics and\nelectronic structure in semiconductor Ta$_2$NiS$_5$ by polarization-resolved\nRaman spe…
View article: Using strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa2Cu3Oy
Using strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa2Cu3Oy Open
View article: Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe2
Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe2 Open
View article: Doping-Induced Electronic and Structural Phase Transition in the Bulk Weyl Semimetal Mo1-xWxTe2
Doping-Induced Electronic and Structural Phase Transition in the Bulk Weyl Semimetal Mo1-xWxTe2 Open
A comprehensive study of the electronic and structural phase transition from 1T` to Td in the bulk Weyl semimetal Mo1-xWxTe2 at different doping concentrations has been carried out using time-of-flight momentum microscopy (including circul…
View article: Colossal c-axis response and lack of rotational symmetry breaking within the kagome plane of the CsV$_3$Sb$_5$ superconductor
Colossal c-axis response and lack of rotational symmetry breaking within the kagome plane of the CsV$_3$Sb$_5$ superconductor Open
The kagome materials AV4$_3$Sb$_5$ (A = K, Rb, Cs) host an intriguing interplay between unconventional superconductivity and charge-density-waves. Here, we investigate CsV$_3$Sb$_5$ by combining high-resolution thermal-expansion, heat-capa…
View article: Using strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa$_{2}$Cu$_{3}$O$_{\rm{y}}$
Using strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa$_{2}$Cu$_{3}$O$_{\rm{y}}$ Open
Uniaxial pressure provides an efficient approach to control the competition between charge density waves (CDWs) and superconductivity in underdoped YBa$_{2}$Cu$_{3}$O$_{\rm{y}}$. It can enhance the correlation volume of ubiquitous short-ra…
View article: Elastoresistivity in the incommensurate charge density wave phase of BaNi2(As1−xPx)2
Elastoresistivity in the incommensurate charge density wave phase of BaNi2(As1−xPx)2 Open
View article: An electronic nematic liquid in BaNi2As2
An electronic nematic liquid in BaNi2As2 Open
View article: Evidence for a Square-Square Vortex Lattice Transition in a High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math> Cuprate Superconductor
Evidence for a Square-Square Vortex Lattice Transition in a High- Cuprate Superconductor Open
Using sound velocity and attenuation measurements in high magnetic fields, we identify a new transition in the vortex lattice state of La_{2-x}Sr_{x}CuO_{4}. The transition, observed in magnetic fields exceeding 35 T and temperatures far b…
View article: Charge-density-wave transitions, phase diagram, soft phonon and possible electronic nematicity: a thermodynamic investigation of BaNi2(As,P)2
Charge-density-wave transitions, phase diagram, soft phonon and possible electronic nematicity: a thermodynamic investigation of BaNi2(As,P)2 Open
A detailed investigation of BaNi2(As,P)2 single crystals using high-resolution thermal-expansion, heat-capacity,Young-modulus and resistivity measurements is presented. The experimental data are complemented by density-functional calculati…
View article: Effect of pseudogap on electronic anisotropy in the strain dependence of the superconducting <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math> of underdoped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">Y</mml:mi><mml:msub><mml:mrow><mml:mi>Ba</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mi>y</mml:mi></mml:msub></mml:math>
Effect of pseudogap on electronic anisotropy in the strain dependence of the superconducting of underdoped Open
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View article: Evidence for a square-square vortex lattice transition in a high-$T_\textrm{c}$ cuprate superconductor
Evidence for a square-square vortex lattice transition in a high-$T_\textrm{c}$ cuprate superconductor Open
Using sound velocity and attenuation measurements in high magnetic fields, we identify a new transition in the vortex lattice state of La$_{2-x}$Sr$_{x}$CuO$_4$ (LSCO). The transition, observed in magnetic fields exceeding 35 T and tempera…
View article: Effect of pseudogap on electronic anisotropy in the strain dependence of\n the superconducting $T_c$ of underdoped YBa$_2$Cu$_3$O$_y$
Effect of pseudogap on electronic anisotropy in the strain dependence of\n the superconducting $T_c$ of underdoped YBa$_2$Cu$_3$O$_y$ Open
For orthorhombic superconductors we define thermodynamic anisotropy $N \\equiv\nd T_c/d \\epsilon_{22} - dT_c/d \\epsilon_{11}$ as the difference in how\nsuperconducting $T_c$ varies with strains $\\epsilon_{ii}$, $i=(1, 2)$, along\nthe in…
View article: High magnetic field ultrasound study of spin freezing in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>1.88</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mrow><mml:mn>0.12</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
High magnetic field ultrasound study of spin freezing in Open
High-$T_{\\rm{c}}$ cuprate superconductors host spin, charge and lattice instabilities. In particular, in the antiferromagnetic glass phase, over a large doping range, lanthanum based cuprates display a glass-like spin freezing with antife…
View article: Emerging symmetric strain response and weakening nematic fluctuations in strongly hole- doped iron-based superconductors
Emerging symmetric strain response and weakening nematic fluctuations in strongly hole- doped iron-based superconductors Open
Electronic nematicity is often found in unconventional superconductors, suggesting its rele- vance for electronic pairing. In the strongly hole-doped iron-based superconductors, the symmetry channel and strength of the nematic fluctuations…
View article: High magnetic field ultrasound study of spin freezing in La$_{1.88}$Sr$_{0.12}$CuO$_4$
High magnetic field ultrasound study of spin freezing in La$_{1.88}$Sr$_{0.12}$CuO$_4$ Open
High-$T_{\rm{c}}$ cuprate superconductors host spin, charge and lattice instabilities. In particular, in the antiferromagnetic glass phase, over a large doping range, lanthanum based cuprates display a glass-like spin freezing with antifer…
View article: Ultrasound studies of the normal state of high temperature cuprates superconductors
Ultrasound studies of the normal state of high temperature cuprates superconductors Open
Dans les cuprates, des oxydes de cuivre, une supraconductivité non conventionnelle, confinée entre isolant de Mott et liquide de Fermi corrélé, apparaît par dopage chimique en porteurs de charges. Au-delà de la supraconductivité, le diagra…
View article: Etudes ultrasonores de l'état normal des cuprates supraconducteurs à haute température critique
Etudes ultrasonores de l'état normal des cuprates supraconducteurs à haute température critique Open
In cuprates, copper oxides, an unconventionnal superconductivity appears by chemical doping between a Mott insulator and a correlated Fermi liquid. Beyond superconductivity, the phase diagram includes multiple broken symmetry phases, inclu…
View article: High field charge order across the phase diagram of YBa2Cu3Oy
High field charge order across the phase diagram of YBa2Cu3Oy Open
View article: High field charge order across the phase diagram of $YBa_2Cu_3O_y$
High field charge order across the phase diagram of $YBa_2Cu_3O_y$ Open
In hole-doped cuprates there is now compelling evidence that inside the pseudogap phase, charge order breaks translational symmetry leading to a reconstruction of the Fermi surface. In $YBa_2Cu_3O_y$ charge order emerges in two steps: a 2D…