Low-energy magnetic response of the noncentrosymmetric heavy-fermion superconductor CePt3Si (2008)
Fak, B., Raymond, S., Braithwaite, D., Lapertot, G.
The low-energy magnetic excitations of the noncentrosymmetric heavy-fermion superconductor CePt3Si have been measured with inelastic neutron scattering on a single crystal. Kondo-type spin...
Magnetic-field-dependence of the YbRh2Si2 Fermi surface (2008)
Rourke, P. M. C., McCollam, A., Lapertot, G., Knebel, G., Flouquet, J., Julian, S. R.
Magnetic-field-induced changes of the Fermi surface play a central role in theories of the exotic quantum criticality of YbRh2Si2. We have carried out de Haas-van Alphen measurements in the magnetic...
The high-field Fermi surface of YbRh2Si2 (2008)
Rourke, P. M. C., McCollam, A., Lapertot, G., Knebel, G., Flouquet, J., Julian, S. R.
We present quantum oscillation measurements of YbRh2Si2 at magnetic fields above the Kondo-suppression scale H0 ~ 10 T. Comparison with electronic structure calculations is complicated because the...
Koutroulakis, G., Mitrović, V. F., Horvatić, M., Berthier, C., Lapertot, G., Flouquet, J.
We report $^{115}$In nuclear magnetic resonance (NMR) measurements in CeCoIn$_5$ at low temperature ($T \approx 70$ mK) as a function of magnetic field ($H_0$) from 2 T to 13.5 T applied...
Mitrović, V. F., Koutroulakis, G., Klanjšek, M., Horvatić, M., Berthier, C., Lapertot, G., ...
The study of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state has been of considerable recent interest. Below the temperature $T^*$ which is believed to be the transition temperature ($T$) to the...
Yaouanc, A., De Reotier, P. Dalmas, Chapuis, Y., Marin, C., Lapertot, G., Cervellino, A., ...
We report a study of the triangular lattice Heisenberg magnet NiGa2S4 by the positive muon spin rotation and relaxation technique. We unravel three temperature regimes: (i) below T_c = 9.2(2) K a...
Banks, M. G., Kremer, R. K., Lapertot, G., Mannix, D., Murani, A. P.
TmGa$_{3}$ (AuCu$_3$ structure) undergoes two phase transitions, an antiferroquadrupolar transition at $\sim$ 4.29 K and long-range antiferromagnetic ordering at $\sim$ 4.26 K. Due to the close...
Phase Diagram of CeCoIn_5 in the Vicinity of H_{c2} as Determined by NMR (2007)
Mitrović, V. F., Koutroulakis, G., Horvatić, M., Berthier, C., Lapertot, G., ...
We report ^{115}In nuclear magnetic resonance (NMR) measurements in the heavy-fermion superconductor CeCoIn_5 as a function of temperature in different magnetic fields applied parallel to the $(\hat...
ESR of YbRh2Si2 and 174YbRh2Si2 : local and itinerant properties (2007)
Wykhoff, J., Sichelschmidt, J., Lapertot, G., Knebel, G., Flouquet, J., Fazlishanov, I. I., ...
Below the Kondo temperature the heavy Fermion compound YbRh$_{2}$Si$_{2}$ shows a well defined Electron Spin Resonance (ESR) with local Yb$^{3+}$ properties. We report a detailed analysis of the ESR...
Vannette, M. D., Safa-Sefat, A., Jia, S., Law, S. A., Lapertot, G., Bud'ko, S. L., ...
Dynamic magnetic susceptibility, $\chi$, was studied in several intermetallic materials exhibiting ferromagnetic, antiferromagnetic and metamagnetic transitions. Precise measurements by using a 14...
Braithwaite, D., Lapertot, G., Bordet, P., Sugawara, H., ...
A thorough characterization of many samples of the filled skutterudite compound PrOs4Sb12 is provided. We find that the double superconducting transition in the specific heat Tc1~1.89K and Tc2~1.72K...
On the local and itinerant properties of the ESR in YbRh2Si2 (2007)
Wykhoff, J., Sichelschmidt, J., Lapertot, G., Knebel, G., Flouquet, J., Fazlishanov, I. I., ...
Anisotropic thermal expansion and magnetostriction of YNi$_2$B$_2$C single crystals (2006)
Bud'ko, S. L., Schmiedeshoff, G. M., Lapertot, G., Canfield, P. C.
We present results of anisotropic thermal expansion and low temperature magnetostriction measurements on YNi$_2$B$_2$C single crystals grown by high temperature flux and floating zone techniques....
Observation of Spin Susceptibility Enhancement in the Possible FFLO State in CeCoIn$_5$ (2006)
Mitrovic, V. F., Horvatic, M., Berthier, C., Knebel, G., Lapertot, G., Flouquet, J.
We report $^{115}$In nuclear magnetic resonance (NMR) measurements of the heavy-fermion superconductor CeCoIn$_5$ in the vicinity of the superconducting critical field $H_{c2}$ for a magnetic field...
Knebel, G., Boursier, R., Hassinger, E., Lapertot, G., Niklowitz, P. G., Pourret, A., ...
We present detailed measurements of the electrical resistivity and microcalorimetry under magnetic field and high pressure which confirm the proximity of YbRh2Si2 to a quantum critical point at...
Mitrović, V. F., Horvatić, M., Berthier, C., Knebel, G., Lapertot, G., Flouquet, J.
We report In-115 nuclear magnetic resonance measurements of the heavy-fermion superconductor CeCoIn5 in the vicinity of the superconducting critical field H-c2 for a magnetic field applied...
Evidence for an antiferromagnetic component in the magnetic structure of ZrZn2 (2005)
De Reotier, P. Dalmas, Lapertot, G., Yaouanc, A., Gubbens, P. C. M., Sakarya, S., Amato, A.
Zero-field muon spin rotation experiments provide evidence for an antiferromagnetic component in the magnetic structure of the intermetallics ZrZn2.
Valence and magnetic ordering in intermediate valence compounds : TmSe versus SmB6 (2005)
Derr, J., Knebel, G., Lapertot, G., Salce, B., Measson, M-A., Flouquet, J.
The intermediate valent systems TmSe and SmB6 have been investigated up to 16 and 18 GPa by ac microcalorimetry with a pressure (p) tuning realized in situ at low temperature. For TmSe, the...
Valence and magnetic instabilities in Sm compounds at high pressures (2005)
Barla, A., Derr, J., Salce, B., Lapertot, G., Flouquet, J., ...
We report on the study of the response to high pressures of the electronic and magnetic properties of several Sm-based compounds, which span at ambient pressure the whole range of stable charge...
Probing the extended non-Fermi liquid regimes of MnSi and Fe (2005)
Pedrazzini, P., Jaccard, D., Lapertot, G., Flouquet, J., Inada, Y., Kohara, H., ...
Recent studies show that the non-Fermi liquid (NFL) behavior of MnSi and Fe spans over an unexpectedly broad pressure range, between the critical pressure p_c and around 2p_c. In order to determine...
Valence and magnetic instabilities in Sm compounds at high pressures (2004)
Barla, A., Derr, J., Salce, B., Lapertot, G., Flouquet, J., ...
We report on the study of the response to high pressures of the electronic and magnetic properties of several Sm-based compounds, which span at ambient pressure the whole range of stable charge...
Valence and magnetic instabilities in Sm compounds at high pressures (2004)
Barla, A., Derr, J., Salce, B., Lapertot, G., Flouquet, J., ...
We report on the study of the response to high pressures of the electronic and magnetic properties of several Sm-based compounds, which span at ambient pressure the whole range of stable charge...
Valence and magnetic instabilities in Sm compounds at high pressures (2004)
Barla, A., Derr, J., Salce, B., Lapertot, G., Flouquet, J., ...
We report on the study of the response to high pressures of the electronic and magnetic properties of several Sm-based compounds, which span at ambient pressure the whole range of stable charge...
Pressure-induced magnetic phase transition in gold-phase SmS (2004)
Haga, Y., Derr, J., Barla, A., Salce, B., Lapertot, G., Sheikin, I., ...
Knafo, W., Raymond, S., Fak, B., Lapertot, G., Canfield, P. C., Flouquet, J.
Inelastic neutron scattering experiments were performed on single crystals of the heavy-fermion compound CeIn$_{3}$ for temperatures below and above the N\'eel temperature, $T_N$. In the...
Magneto-optical studies of the uniform critical state in bulk MgB2 (2001)
Polyanskii, A. A., Gurevich, A., Jiang, J., Larbalestier, D. C., Bud'ko, S. L., Finnemore, D. K., ...
We present a detailed magneto-optical investigation of the magnetic flux penetration in polycrystalline MgB2 slabs made by direct reaction of B and Mg. Our results unambiguously indicate a uniform,...
Phonon-assisted electronic topological transition in MgB2 under pressure (2001)
Struzhkin, V. V., Goncharov, A. F., Hemley, R. J., Mao, H. K., Lapertot, G., Bud'ko, S. L., ...
We report measurements of the superconducting critical temperature Tc of polycrystalline MgB2 samples containing isotopically pure (10)B and (11)B under quasi-hydrostatic pressure conditions in He...
Goncharov, A. F., Struzhkin, V. V., Gregoryanz, E., Mao, H. K., Hemley, R. J., Lapertot, G., ...
We have observed a strongly broadened Raman band of MgB2 that shows anomalously large pressure dependence of its frequency. This band and its pressure dependence can be interpreted as the E2g zone...
Anisotropy of superconducting MgB2 as seen in electron spin resonance and magnetization data (2001)
Simon, F., Janossy, A., Feher, T., Muranyi, F., Garaj, S., Forro, L., ...
We have observed the conduction electron spin resonance (CESR) in fine powders of MgB2 both in the superconducting and normal states. The Pauli susceptibility is chi_s=2.0*10^{-5} emu/mole in the...
Raman spectrum and lattice parameters of MgB2 as a function of pressure (2001)
Goncharov, Alexander F., Struzhkin, Viktor V., Gregoryanz, Eugene, Hu, Jingzhu, Hemley, Russell J., Mao, Ho-kwang, ...
We report Raman spectra and synchrotron x-ray diffraction measurements of lattice parameters of polycrystalline MgB2 under hydrostatic pressure conditions up to 15 GPa. An anomalously broadened Raman...
Superconducting MgB2 thin films by pulsed laser deposition (2001)
Shinde, S. R., Ogale, S. B., Greene, R. L., Venkatesan, T., Canfield, P. C., Budko, S. L., ...
Growth of MgB2 thin films by pulsed laser deposition is examined under ex situ and in situ processing conditions. For the ex situ process, Boron films grown by PLD were annealed at 900 C with excess...
Synthesis and Processing of $MgB_2$ powders and wires (2001)
Cunningham, C. E., Petrovic, C., Lapertot, G., Bud'ko, S. L., Laabs, F., Straszheim, W., ...
Sintered powders and wires of superconducting $MgB_2$ have been fabricated under a variety of conditions in order to determine details of the diffusion of the $Mg$ into $B$ and to study the types of...
$^{11}B$ NMR and Relaxation in $MgB_2$ Superconductor (2001)
Jung, J. K., Baek, Seung Ho, Borsa, F., Bud'ko, S. L., Lapertot, G., Canfield, P. C.
$^{11}B$ NMR and nuclear spin-lattice relaxation rate (NSLR) are reported at 7.2 Tesla and 1.4 Tesla in powder samples of the intermetallic compound $MgB_2$ with superconducting transition...
Magnetoresistivity and Complete $H_{c2}(T)$ in $MgB_2$ (2001)
Bud'ko, S. L., Petrovic, C., Lapertot, G., Cunningham, C. E., Canfield, P. C., Jung, M-H., ...
Detailed magneto-transport data on dense wires of $MgB_2$ are reported for applied magnetic fields up to 18 T. The temperature and field dependencies of the electrical resistivity are consistent with...
Superconductivity in Dense $MgB_2$ Wires (2001)
Canfield, P. C., Finnemore, D. K., Bud'ko, S. L., Ostenson, J. E., Lapertot, G., Cunningham, C. E., ...
$MgB_2$ becomes superconducting just below 40 K. Whereas porous polycrystalline samples of $MgB_2$ can be synthesized from boron powders, in this letter we demonstrate that dense wires of $MgB_2$ can...
Thermodynamic and Transport Properties of Superconducting $Mg^{10}B_2$ (2001)
Finnemore, D. K., Ostenson, J. E., Bud'ko, S. L., Lapertot, G., Canfield, P. C.
Transport and thermodynamic properties of a sintered pellet of the newly discovered $MgB_2$ superconductor have been measured to determine the characteristic critical magnetic fields and critical...
Boron Isotope Effect in Superconducting MgB$_2$ (2001)
Bud'ko, S. L., Lapertot, G., Petrovic, C., Cunningham, C. E., Anderson, N., Canfield, P. C.
We report the preparation method of, and boron isotope effect for MgB$_2$, a new binary intermetallic superconductor with a remarkably high superconducting transition temperature $T_c$($^{10}$B) =...
Magnetization under High Pressure in MnSi (1998)
Thessieu, C., Kamishima, K., Goto, T., Lapertot, G.
The magnetization M(H) has been measured in the weakly helimagnetic itinerant compound MnSi under high pressure up to 10.2 kbar and high magnetic field up to 9 Tesla. We interpret the simultaneous...
NMR Study of MnSi under Pressure (1998)
Thessieu, C., Ishida, K., Kitaoka, Y., Asayama, K., Lapertot, G.
The magnetic phase diagram $T_c(P)$ of the weak itinerant helimagnetic compound MnSi is reviewed upon a Nuclear Magnetic Resonance (NMR) experiment. We present a systematic study on the evolution of...