Thickness-tuned Superconductor-to-Insulator Transitions under magnetic field in a-NbSi (2008)
Marrache-Kikuchi, C. A., Aubin, H., Pourret, A., Behnia, K., Lesueur, J., Berge, L., ...
We have studied the thickness-induced superconductor-to-insulator transition in the presence of a magnetic field for a-NbSi thin films. Analyzing the critical behavior of this system within the...
On the destruction of the hidden order in URu$_2$Si$_2$ by a strong magnetic field (2008)
Levallois, J., Behnia, K., Flouquet, J., Lejay, P., Proust, C.
We present a study of transport properties of the heavy fermion URu$_2$Si$_2$ in pulsed magnetic field. The large Nernst response of the hidden order state is found to be suppressed when the magnetic...
Transport anomalies across the quantum limit in semimetallic Bi$_{0.96}$Sb$_{0.04}$ (2008)
Banerjee, A., Fauque, B., Izawa, K., Miyake, A., Sheikin, I., Flouquet, J., ...
We report on a study of electronic transport in semi-metallic Bi$_{0.96}$Sb$_{0.04}$. At zero field, the system is a very dilute Fermi liquid displaying a T$^{2}$ resistivity with an enhanced...
Gap opening with ordering in PrFe4P12 studied by local tunneling spectroscopy (2008)
Suderow, H., Behnia, K., Guillamon, I., Crespo, V., Vieira, S., Kikuchi, D., ...
We present measurements of the local tunneling density of states in the low temperature ordered state of PrFe4P12. The temperature dependencies of the Fermi level density of states and of the...
Skutterudite Results Shed Light on Heavy Fermion Physics (2007)
Hassinger, E., Derr, J., Levallois, J., Aoki, D., Behnia, K., Bourdarot, F., ...
Only few selected examples among the great diversity of anomalous rare earth skutterudite are reviewed. Focus is first given on PrFe4P12 in comparison with URu2Si2. For PrFe4P12, great progress has...
Nernst effect in the phase-fluctuating superconductor InO$_x$ (2007)
Spathis, P., Aubin, H., Pourret, A., Behnia, K.
We present a study of the Nernst effect in amorphous 2D superconductor InO$_x$, whose low carrier density implies low phase rigidity and strong superconducting phase fluctuations. Instead of...
Okazaki, R., Kasahara, Y., Shishido, H., Konczykowski, M., Behnia, K., Haga, Y., ...
We find that in ultraclean heavy-fermion superconductor URu$_2$Si$_2$ ($T_{c0}=1.45$ K) a distinct flux line lattice melting transition with outstanding characters occurs well below the mean-field...
Kasahara, Y., Iwasawa, T., Shishido, H., Shibauchi, T., Behnia, K., Haga, Y., ...
We show that the charge and thermal transport measurements on ultraclean crystals of URu2Si2 reveal a number of unprecedented superconducting properties. The uniqueness is best highlighted by the...
Thermoelectric response near a quantum critical point: the case of CeCoIn5 (2007)
Izawa, K., Behnia, K., Matsuda, Y., Shishido, H., Settai, R., Onuki, Y., ...
We present a study of thermoelectric coefficients in CeCoIn_5 down to 0.1 K and up to 16 T in order to probe the thermoelectric signatures of quantum criticality. In the vicinity of the field-induced...
Capan, C., Behnia, K., Li, Z. Z., Raffy, H., Marin, C.
We present a comparative study of Nernst effect and resistivity in underdoped samples of Bi$_2$Sr$_2$CuO$_{6+\delta}$ and La$_{2-x}$Sr$_{x}$CuO$_4$. The Nernst effect presents a peak in a region of...
Capan, C., Behnia, K., Hinderer, J., Jansen, A. G. M., Lang, W., Marcenat, Ch., ...
We present a study of Nernst effect in underdoped $La_{2-x}Sr_xCuO_4$ in magnetic fields as high as 28T. At high fields, a sizeable Nernst signal was found to persist in presence of a field-induced...
A length scale for the superconducting Nernst signal above T$_{c}$ in Nb$_{0.15}$Si$_{0.85}$ (2007)
Pourret, A., Aubin, H., Lesueur, J., Marrache-Kikuchi, C.A., Berge, L., Dumoulin, L., ...
We present a study of the Nernst effect in amorphous superconducting thin films of Nb$_{0.15}$Si$_{0.85}$. The field dependence of the Nernst coefficient above T$_{c}$ displays two distinct regimes...
A length scale for the superconducting Nernst signal above T$_{c}$ in Nb$_{0.15}$Si$_{0.85}$ (2007)
Pourret, A., Aubin, H., Lesueur, J., Marrache-Kikuchi, C. A., Berge, L., Dumoulin, L., ...
We present a study of the Nernst effect in amorphous superconducting thin films of Nb$_{0.15}$Si$_{0.85}$. The field dependence of the Nernst coefficient above T$_{c}$ displays two distinct regimes...
Li, Pengcheng, Behnia, K., Greene, R. L.
The evidence for a quantum phase transition under the superconducting dome in the high-$T_c$ cuprates has been controversial. We report low temperature normal state thermopower(S) measurements in...
Observation of the Nernst signal generated by fluctuating Cooper pairs (2006)
Pourret, A., Aubin, H., Lesueur, J., Marrache-Kikuchi, C.A., Berge, L., Dumoulin, L., ...
Long-range order is destroyed in a superconductor warmed above its critical temperature (Tc). However, amplitude fluctuations of the superconducting order parameter survive and lead to a number of...
Nakajima, Y., Shishido, H., Nakai, H., Shibauch, T., Behnia, K., Izawa, K., ...
We present a systematic study of the dc-resistivity, Hall effect, and magnetoresistance in the normal state of quasi 2D heavy fermion superconductors CeMIn5 (M: Rh and Co) under pressure. Here the...
Observation of the Nernst signal generated by fluctuating Cooper pairs (2006)
Pourret, A., Aubin, H., Lesueur, J., Marrache-Kikuchi, C. A., Berge, L., Dumoulin, L., ...
Long-range order is destroyed in a superconductor warmed above its critical temperature (Tc). However, amplitude fluctuations of the superconducting order parameter survive and lead to a number of...
Magnetic field-induced quantum superconductor-insulator transition in $Nb_{0.15}Si_{0.85}$ (2006)
Aubin, H., Marrache-Kikuchi, C.A., Pourret, A., Behnia, K., Berge, L., Dumoulin, L., ...
A study of magnetic-field tuned superconductor-insulator transitions in amorphous $Nb_{0.15}Si_{0.85}$ thin films shows that quantum superconductor-insulator transitions are characterized by an...
Evolution of Hall coefficient in two-dimensional heavy fermion CeCoIn$_5$ (2006)
Nakajima, Y., Izawa, K., Matsuda, Y., Behnia, K., Kontani, H., Hedo, M., ...
We report on the pressure dependence of the Hall coefficient $R_H$ in quasi-2D heavy fermion CeCoIn$_5$. At ambient pressure, below a temperature associated with the emergence of non-Fermi liquid...
Magnetic field-induced quantum superconductor-insulator transition in $Nb_{0.15}Si_{0.85}$ (2006)
Aubin, H., Marrache-Kikuchi, C. A., Pourret, A., Behnia, K., Berge, L., Dumoulin, L., ...
A study of magnetic-field tuned superconductor-insulator transitions in amorphous $Nb_{0.15}Si_{0.85}$ thin films shows that quantum superconductor-insulator transitions are characterized by an...
Magnetic field-induced quantum superconductor-insulator transition in $Nb_{0.15}Si_{0.85}$ (2006)
Aubin, H., Marrache-Kikuchi, C.A., Pourret, A., Behnia, K., Berge, L., Dumoulin, L., ...
A study of magnetic-field tuned superconductor-insulator transitions in amorphous $Nb_{0.15}Si_{0.85}$ thin films shows that quantum superconductor-insulator transitions are characterized by an...
Evidence for a new magnetic field scale in CeCoIn5 (2006)
Sheikin, I., Jin, H., Bel, R., Behnia, K., Proust, C., Flouquet, J., ...
The Nernst coefficient of CeCoIn5 displays two distinct anomalies in magnetic field. The feature detected at H-K similar to 23 T is similar to what is observed in CeRu2Si2 at H-m=7.8 T where a...
Drastic change in transport of entropy with quadrupolar ordering in PrFe$_{4}$P$_{12}$ (2005)
Pourret, A., Behnia, K., Kikuchi, D., Aoki, Y., Sugawara, H., Sato, H.
The antiferroquadrupolar ordering of PrFe$_{4}$P$_{12}$ is explored by probing thermal and thermoelectric transport. The lattice thermal conductivity drastically increases with the ordering, as a...
Anomalous quasiparticle transport in the superconducting state of CeCoIn5 (2005)
Kasahara, Y., Nakajima, Y., Izawa, K., Matsuda, Y., Behnia, K., Shishido, H., ...
We report on a study of thermal Hall conductivity k_xy in the superconducting state of CeCoIn_5. The scaling relation and the density of states of the delocalized quasiparticles, both obtained from...
Evidence for a new magnetic field scale in CeCoIn5 (2005)
Sheikin, I., Jin, H., Bel, R., Behnia, K., Proust, C., Flouquet, J., ...
The Nernst coefficient of CeCoIn5 displays a distinct anomaly at H_K ~ 23 T. This feature is reminiscent of what is observed at 7.8 T in CeRu2Si2, a well-established case of metamagnetic transition....
Line nodes in the superconducting gap function of noncentrosymmetric CePt_3Si (2005)
Izawa, K., Kasahara, Y., Matsuda, Y., Behnia, K., Yasuda, T., Settai, R., ...
The superconducting gap structure of recently discovered heavy fermion CePt_3Si without spatial inversion symmetry was investigated by thermal transport measurements down to 40 mK. In zero field a...
Thermal transport in the hidden-order state of URu$_{2}$Si$_{2}$ (2004)
Behnia, K., Bel, R., Kasahara, Y., Nakajima, Y., Jin, H., Aubin, H., ...
We present a study of thermal conductivity in the normal state of the heavy-fermion superconductor URu$_{2}$Si$_{2}$. Ordering at 18K leads to a steep increase in thermal conductivity and (in...
Test of the Wiedemann-Franz Law in an Optimally Doped Cuprate (2004)
Bel, R., Behnia, K., Proust, C., K. Maude, D., I. Vedeneev, S.
We present a one-heater-two-thermometer setup for measuring thermal conductivity and electric resistivity of a bulk sample at low temperatures down to 0.1 K and in magnetic fields up to 27 T. The...
Test of the Wiedemann-Franz law in an optimally doped cuprate (2004)
Bel, R., Behnia, K., Proust, C., Maude, D., Vedeneev, S. I.
We present a study of heat and charge transport in Bi2+xSr2-xCuO6+delta focused on the size of the low-temperature linear term of the thermal conductivity at optimal-doping level. In the...
Giant Nernst effect in a Kondo lattice close to a quantum critical point (2003)
Bel, R., Behnia, K., Nakajima, Y., Izawa, K., Matsuda, Y., Shishido, H., ...
We present a study of Nernst and Seebeck coefficients of the heavy-fermion superconductor CeCoIn$_{5}$. Below 18 K, concomitant with a field-dependent Seebeck coefficient, a large sub-linear Nernst...
We present a one-heater-two-thermometer set-up for measuring thermal conductivity and electric resistivity of a bulk sample at low temperatures down to 0.1 K and in magnetic fields up to 27 Tesla....
Capan, C., Behnia, K., Li, Z. Z., Raffy, H., Marin, C.
We present a comparative study of Nernst effect and resistivity in underdoped samples of Bi$_2$Sr$_2$CuO$_{6+\delta}$ and La$_{2-x}$Sr$_{x}$CuO$_4$. The Nernst effect presents a peak in a region of...
The ground state of heavily-overdoped non-superconducting La$_{2-x}$Sr$_x$CuO$_4$ (2002)
Nakamae, S., Behnia, K., Mangkorntong, N., Nohara, M., Takagi, H., Yates, S. J. C., ...
We report detailed thermodynamic and transport measurements for non-superconducting La$_{1.7}$Sr$_{0.3}$CuO$_4$. Collectively, these data reveal that a highly-correlated Fermi-liquid ground state...
Transport de chaleur dans la phase normale de cuprates supraconducteurs (2002)
Proust, C., Taillefer, L., Hill, R.W., Boaknin, E., Behnia, K., Bel, R.
Entropy of vortex cores near the superconductor-insulator transition in an underdoped cuprate (2002)
Capan, C., Behnia, K., Hinderer, J., Jansen, A. G. M., Lang, W., Marcenat, C., ...
We present a study of Nernst effect in underdoped La2-xSrxCuO4 in magnetic fields as high as 28 T. At high fields, a sizable Nernst signal was found to persist in the presence of a field- induced...
Capan, C., Behnia, K., Hinderer, J., Jansen, A. G. M., Lang, W., Marcenat, Ch., ...
We present a study of Nernst effect in underdoped $La_{2-x}Sr_xCuO_4$ in magnetic fields as high as 28T. At high fields, a sizeable Nernst signal was found to persist in presence of a field-induced...
Effect of controlled disorder on quasiparticle thermal transport in Bi$_2$Sr$_2$CaCu$_2$O$_8$ (2000)
Nakamae, S., Behnia, K., Balicas, L., Rullier-Albenque, F., Berger, H., Tamegai, T.
Low temperature thermal conductivity, $\kappa$, of optimally-doped Bi2212 was studied before and after the introduction of point defects by electron irradiation. The amplitude of the linear component...
Absence of residual quasiparticle conductivity in the underdoped cuprate YBa2Cu4O8 (2000)
Hussey, N. E., Nakamae, S., Behnia, K., Takagi, H., Urano, C., Adachi, S., ...
We report here measurements of the in-plane thermal conductivity K(T) of the underdoped cuprate YBa2Cu4O8 (Y124) below 1K. K(T) is shown to follow a simple, phononic T^3 dependence at the lowest...
Internal avalanches in a pile of superconducting vortices (1999)
Behnia, K., Capan, C., Mailly, D., Etienne, B.
Using an array of miniature Hall probes, we monitored the spatiotemporal variation of the internal magnetic induction in a superconducting niobium sample during a slow sweep of external magnetic...
Aubin, H., Behnia, K., Ooi, S., Tamegai, T.
The thermal conductivity ,$\kappa$, of Bi_2Sr_2CaCu_2O_8 was studied as a function of magnetic field. Above 5 K, after an initial decrease, $\kappa(H)$ presents a kink followed by a plateau, as...
Heat Conduction in $\kappa$-(BEDT-TTF)$_2$Cu(NCS)$_2$ (1998)
Belin, S., Behnia, K., Deluzet, A.
The first study of thermal conductivity, $\kappa$, in a quasi-two-dimensional organic superconductor of the $\kappa$-(BEDT-TTF)$_2$X family reveals features analogous to those already observed in the...
Aubin, H., Behnia, K., Ooi, S., Tamegai, T.
We studied the thermal conductivity of a Bi_2Sr_2CaCu_2O_8 single crystal as a function of a magnetic field ramped up and down and then reversed. As recently discovered by Krishana et al., we...
Angular position of nodes in the superconducting gap of YBCO (1996)
Aubin, H., Behnia, K., Ribault, M., Gagnon, R., Taillefer, L.
The thermal conductivity of a YBCO single crystal has been studied as a function of the relative orientation of the crystal axes and a magnetic field rotating in the Cu-O planes. Measurements were...
Behnia, K., Aubin, H., Taillefer, L., Gagnon, R.
The thermal conductivity of Zn-doped YBCO crystals was studied at low temperature (0.15 < T < 0.8 K) for different concentrations of Zn impurities. A small amount of Zn induces a dramatic decrease in...
Superconductivity and magnetic field induced spin density waves in the (TMTTF)2X family (1994)
Balicas, L., Behnia, K., Kang, W., Canadell, E., Auban-Senzier, P., Jérome, D., ...
We report magnetotransport measurements in the quasi one dimensional (Q-1-D) organic conductor (TMTTF)2Br at pressures up to 26 kbar, clown to 0.45 K in magnetic fields up to 19 T along the c*...
Superconductivity and magnetic field induced spin density waves in the (TMTTF)2X family (1994)
Balicas, L., Behnia, K., Kang, W., Canadell, E., Auban-Senzier, P., Jérome, D., ...
We report magnetotransport measurements in the quasi one dimensional (Q-1-D) organic conductor (TMTTF)2Br at pressures up to 26 kbar, clown to 0.45 K in magnetic fields up to 19 T along the c*...
Superconductivity and magnetic field induced spin density waves in the (TMTTF)2X family (1994)
Balicas, L., Behnia, K., Kang, W., Canadell, E., Auban-Senzier, P., Jérome, D., ...
We report magnetotransport measurements in the quasi one dimensional (Q-1-D) organic conductor (TMTTF)2Br at pressures up to 26 kbar, clown to 0.45 K in magnetic fields up to 19 T along the c*...