S. Badoux

Inverse correlation between quasiparticle mass and Tc in a cuprate high-Tc superconductor

C. Putzke, L. Malone, S. Badoux +8

Close to a zero temperature transition between ordered and disordered electronic phases, quantum fluctuations can lead to a strong enhancement of the electron mass and to the emerg…

cond-mat.supr-con2017

Anisotropy of the Seebeck Coefficient in the Cuprate Superconductor YBa $_{2}$ Cu $_{3}$ O $_{y}$ : Fermi-Surface Reconstruction by Bidirectional Charge Order

O. Cyr-ChoiniÃ¨re, S. Badoux, G. Grissonnanche +11

The Seebeck coefficient $S$ of the cuprate YBa $_{2}$ Cu $_{3}$ O $_{y}$ was measured in magnetic fields large enough to suppress superconductivity, at hole dopings $p = 0.11$ and $p =…

cond-mat.supr-con2013

Quasiparticle mass enhancement close to the quantum critical point in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$

P. Walmsley, C. Putzke, L. Malone +11

We report a combined study of the specific heat and de Haas-van Alphen effect in the iron-pnictide superconductor BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ . Our data when combined with results…

cond-mat.supr-con2017

Pseudogap phase of cuprate superconductors confined by Fermi surface topology

N. Doiron-Leyraud, O. Cyr-ChoiniÃ¨re, S. Badoux +15

The properties of cuprate high-temperature superconductors are largely shaped by competing phases whose nature is often a mystery. Chiefly among them is the pseudogap phase, which…

cond-mat.str-el2025

First observation of quantum oscillations by transport measurements in semi-destructive pulsed magnetic fields up to 125 T

M. Massoudzadegan, S. Badoux, N. Bruyant +13

High magnetic fields have proven instrumental in exploring the physical properties of condensed matter, leading to groundbreaking discoveries such as the quantum Hall effect in 2D…

Thermodynamic signatures of quantum criticality in cuprates

B. Michon, C. Girod, S. Badoux +14

The three central phenomena of cuprate superconductors are linked by a common doping $p^{⋆}$ , where the enigmatic pseudogap phase ends, around which the superconducting phase f…

cond-mat.supr-con2020

Effect of pressure on the pseudogap and charge-density-wave phases of the cuprate La $_{1.6 - x}$ Nd $_{0.4}$ Sr $_{x}$ CuO $_{4}$ probed by thermopower measurements

A. Gourgout, A. Ataei, M. -E. Boulanger +9

We report thermopower measurements under hydrostatic pressure on the cuprate superconductor La $_{1.6 - x}$ Nd $_{0.4}$ Sr $_{x}$ CuO $_{4}$ (Nd-LSCO), at low-temperature in the normal state ac…

Wiedemann-Franz law and abrupt change in conductivity across the pseudogap critical point of a cuprate superconductor

B. Michon, A. Ataei, P. Bourgeois-Hope +8

The thermal conductivity $I^º$ of the cuprate superconductor La $_{1.6 - x}$ Nd $_{0.4}$ Sr $_{x}$ CuO $_{4}$ was measured down to 50 mK in seven crystals with doping from $p = 0.12$ to $p = 0.24$ ,…

cond-mat.str-el2018

Field-dependent heat transport in the Kondo insulator SmB6 : phonons scattered by magnetic impurities

M-E. Boulanger, F. LalibertÃ©, M. Dion +12

The thermal conductivity $I^º$ of the Kondo insulator SmB $_{6}$ was measured at low temperature, down to 70 mK, in magnetic fields up to 15 T, on single crystals grown using both the…

Onset field for Fermi-surface reconstruction in the cuprate superconductor YBCO

G. Grissonnanche, F. Laliberte, S. Dufour-Beausejour +17

Quantum oscillations and negative Hall and Seebeck coefficients at low temperature and high magnetic field have shown the Fermi surface of underdoped cuprates to contain a small cl…

cond-mat.str-el2022

Electrons with Planckian scattering obey standard orbital motion in a magnetic field

A. Ataei, A. Gourgout, G. Grissonnanche +14

In various "strange" metals, electrons undergo Planckian dissipation, a strong and anomalous scattering that grows linearly with temperature, in contrast to the quadratic temperatu…

Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3Oy

G. Grissonnanche, F. Laliberte, S. Dufour-Beausejour +16

The recent detection of charge-density modulations in YBa2Cu3Oy and other cuprate superconductors raises new questions about the normal state of underdoped cuprates. In one class o…

Origin of the metal-to-insulator crossover in cuprate superconductors

F. Laliberte, W. Tabis, S. Badoux +9

Superconductivity in cuprates peaks in the doping regime between a metal at high p and an insulator at low p. Understanding how the material evolves from metal to insulator is a fu…

cond-mat.supr-con2025

Bulk signatures of re-entrant superconductivity in UTe $_{2}$ from ultrasound measurements

N. Marquardt, C. Duffy, C. Proust +7

We report bulk ultrasound measurements up to 80 T and down to 0.5 K of the field re-entrant superconducting phase of the unconventional superconductor UTe $_{2}$ . Clear bulk signature…

Pseudogap temperature $T^{⋆}$ of cuprate superconductors from the Nernst effect

O. Cyr-ChoiniÃ¨re, R. Daou, F. LalibertÃ© +17

We use the Nernst effect to delineate the boundary of the pseudogap phase in the temperature-doping phase diagram of cuprate superconductors. New data for the Nernst coefficient $Î…

Two types of nematicity in the phase diagram of the cuprate superconductor YBa $_{2}$ Cu $_{3}$ O $_{y}$

O. Cyr-ChoiniÃ¨re, G. Grissonnanche, S. Badoux +6

Nematicity has emerged as a key feature of cuprate superconductors, but its link to other fundamental properties such as superconductivity, charge order and the pseudogap remains u…

Sensitivity of $T_{c}$ to pressure and magnetic field in the cuprate superconductor YBa $_{2}$ Cu $_{3}$ O $_{y}$ : evidence of charge order suppression by pressure

O. Cyr-ChoiniÃ¨re, D. LeBoeuf, S. Badoux +7

Cuprate superconductors have a universal tendency to form charge density-wave (CDW) order which competes with superconductivity and is strongest at a doping $p ≃ 0.12$ . Here w…

cond-mat.supr-con2021

Transport signatures of the pseudogap critical point in the cuprate superconductor Bi $_{2}$ Sr $_{2 - x}$ La $_{x}$ CuO $_{6 + I^´}$

M. Lizaire, A. Legros, A. Gourgout +16

Five transport coefficients of the cuprate superconductor Bi $_{2}$ Sr $_{2 - x}$ La $_{x}$ CuO $_{6 + I^´}$ were measured in the normal state down to low temperature, reached by applying a magnet…

cond-mat.supr-con2021

Thermopower across the phase diagram of the cuprate La $_{1.6 - x}$ Nd $_{0.4}$ Sr $_{x}$ CuO $_{4}$ : signatures of the pseudogap and charge-density-wave phases

C. Collignon, A. Ataei, A. Gourgout +11

The Seebeck coefficient (thermopower) $S$ of the cuprate superconductor La $_{1.6 - x}$ Nd $_{0.4}$ Sr $_{x}$ CuO $_{4}$ was measured across its doping phase diagram (from $p = 0.12$ to $p = 0.…

cond-mat.supr-con2025

Charge order in the Pr substituted YBa $_{2}$ Cu $_{3}$ O $_{7}$ from high-field Hall effect measurements

C. M. Duffy, M. Altangerel, S. Badoux +8

The mechanism of doping in the composite Pr $_{x}$ Y $_{1 - x}$ Ba $_{2}$ Cu $_{3}$ O $_{7 - I^´}$ (Pr-YBCO) system is distinct from that of pure YBCO, offering a means to explore the requirements for…

cond-mat.supr-con2014

Anomalous critical fields in quantum critical superconductors

C. Putzke, P. Walmsley, J. D. Fletcher +12

Fluctuations around an antiferromagnetic quantum critical point (QCP) are believed to lead to unconventional superconductivity and in some cases to high-temperature superconductivi…

Evidence for a small hole pocket in the Fermi surface of underdoped YBa2Cu3Oy

N. Doiron-Leyraud, S. Badoux, S. Rene de Cotret +13

The Fermi surface of a metal is the fundamental basis from which its properties can be understood. In underdoped cuprate superconductors, the Fermi surface undergoes a reconstructi…

cond-mat.supr-con2019

Link between magnetism and resistivity upturn in cuprates: a thermal conductivity study of La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$

A key unexplained feature of cuprate superconductors is the upturn in their normal state electrical resistivity $I ¨ (T)$ seen at low temperature inside the pseudogap phase. We exami…

cond-mat.supr-con2017

Fermi-surface transformation across the pseudogap critical point of the cuprate superconductor La $_{1.6 - x}$ Nd $_{0.4}$ Sr $_{x}$ CuO $_{4}$

C. Collignon, S. Badoux, S. A. A. Afshar +8

The electrical resistivity $I ¨ $ and Hall coefficient R $_{H}$ of the tetragonal single-layer cuprate Nd-LSCO were measured in magnetic fields up to $H = 37.5$ T, large enough to acces…

Change of carrier density at the pseudogap critical point of a cuprate superconductor

The pseudogap is a central puzzle of cuprate superconductors. Its connection to the Mott insulator at low doping $p$ remains ambiguous and its relation to the charge order that rec…

cond-mat.mtrl-sci2026

Observation of acoustic magneto-chiral anisotropy in $I^\pm$ -quartz

M. Altangerel, S. Badoux, C. Proust +2

We report the experimental observation of magneto-chiral anisotropy in the longitudinal and transverse ultrasound propagation in $I^\pm$ -quartz. To perform such measurement, we have b…