Results 1 to 10 of about 227,079 (308)

Nonlinear conductivity in CaRuO3 thin films measured by short current pulses [PDF]

Eur. Phys. J. B, 87 6 (2014) 133, 2014
Metals near quantum critical points have been predicted to display universal out-of equilibrium behavior in the steady current-carrying state. We have studied the non-linear conductivity of high-quality CaRuO$_3$ thin films with residual resistivity ratio up to 57 using micro-second short, high-field current pulses at low temperatures.
Esser, Sebastian, Esser, Sven, Gegenwart, Philipp, Stingl, Christian   +3 more
arxiv   +5 more sources

Scaling of the magnetic entropy and magnetization in YbRh_2(Si_{0.95}Ge_{0.05})_2 [PDF]

, 2004
The magnetic entropy of YbRh_2(Si_{0.95}Ge_{0.05})_2 is derived from low-temperature ($T\geq 18$ mK) specific heat measurements. Upon field-tuning the system to its antiferromagnetic quantum critical point unique temperature over magnetic field scaling is observed indicating the disintegration of heavy quasiparticles.
C. Geibel, Custers, F. Steglich, Gegenwart, Hertz, K. Neumaier, Millis, P. Gegenwart, Schröder, Si, Trovarelli, Y. Tokiwa   +11 more
arxiv   +3 more sources

Non-Fermi liquid normal state of the Heavy Fermion superconductor UBe13 [PDF]

Physica C 408--410 (2004) 157--160., 2003
Non-Fermi liquid (NFL) behavior in the normal state of the heavy-fermion superconductor UBe13 is studied by means of low-temperature measurements of the specific heat, C, and electrical resistivity, \rho, on a high-quality single crystal in magnetic fields up to 15.5 T.
Bednorz, C. Langhammer, Cooper, Cox, Cox, F. Steglich, Felten, G.R. Stewart, Gegenwart, Gegenwart, Gegenwart, Hegger, Iye, J.S. Kim, Knetsch, Kromer, Lang, M. Lang, Mathur, Millis, Moriya, N. Oeschler, Ott, Ott, P. Gegenwart, Paglione, Petrovic, R. Helfrich, Ramirez, Rosch, Steglich, Steglich   +31 more
arxiv   +4 more sources

Growth of Sr1-xCaxRuO3 thin films by metalorganic aerosol deposition [PDF]

J. Phys.: Conf. Ser. 200 (2010) 012178, 2009
We report the growth of thin films of Sr1-xCaxRuO3 on SrTiO3 and MgO substrates by metalorganic aerosol deposition. The structure and microstructure is characterized by X-ray diffraction and room-temperature scanning tunnelling microscopy (STM), respectively. STM indicates in-plane epitaxy and a small surface roughness for films on SrTiO3.
M Schneider, P Gegenwart, Powder diffraction file, Schneider M, V Moshnyaga   +4 more
arxiv   +5 more sources

Magnetization study on the field-induced quantum critical point in YbRh_2Si_2 [PDF]

J. Phys.: Conf. Ser. 200, 012205 (2010)., 2009
We study the field-induced quantum critical point (QCP) in YbRh$_2$Si$_2$ by low-temperature magnetization, $M(T)$, and magnetic Gr\"uneisen ratio, $\Gamma_{\rm mag}$, measurements and compare the results with previous thermal expansion, $\beta(T)$, and critical Gr\"uneisen ratio, $\Gamma^{cr}(T)$, data on YbRh$_2$(Si$_{0.95}$Ge$_{0.05}$)$_2$.
Gegenwart, P., Geibel, C., Steglich, F., Tokiwa, Y.   +3 more
arxiv   +5 more sources

Symmetry-breaking lattice distortion in Sr_3Ru_2O_7 [PDF]

Phys. Rev. Lett. 107 (2011) 026404, 2010
The electronic nematic phase of Sr$_3$Ru$_2$O$_7$ is investigated by high-resolution in-plane thermal expansion measurements in magnetic fields close to 8 T applied at various angles $\Theta$ off the c-axis. At $\Theta<10^\circ$ we observe a very small ($10^{-7}$) lattice distortion which breaks the four-fold in-plane symmetry, resulting in nematic ...
Gegenwart, P., Maeno, Y., Perry, R. S., Stingl, C.   +3 more
arxiv   +5 more sources

Divergence of the Magnetic Grüneisen Ratio at the Field-Induced Quantum Critical Point in YbRh$_2$Si$_2$ [PDF]

Phys. Rev. Lett. 102, 066401 (2009), 2008
The heavy fermion compound YbRh$_2$Si$_2$ is studied by low-temperature magnetization $M(T)$ and specific-heat $C(T)$ measurements at magnetic fields close to the quantum critical point ($H_c=0.06$ T, $H\perp c$). Upon approaching the instability, $dM/dT$ is more singular than $C(T)$, leading to a divergence of the magnetic Gr\"uneisen ratio $\Gamma_ ...
Gegenwart, P., Geibel, C., Radu, T., Steglich, F., Tokiwa, Y.   +4 more
arxiv   +3 more sources

Ferromagnetic quantum critical fluctuations in YbRh_2(Si_{0.95}Ge_{0.05})_2 [PDF]

Phys. Rev. Lett. 94, 076402 (2005)., 2005
The bulk magnetic susceptibility $\chi(T,B)$ of YbRh$_2$(Si$_{0.95}$Ge$_{0.05}$)$_2$ has been investigated %by ac-and dc-magnetometry at low temperatures and close to the field-induced quantum critical point at $B_c=0.027$ T. For $B\leq 0.05$ T a Curie-Weiss law with a negative Weiss temperature is observed at temperatures below 0.3 K.
Custers, J., Gegenwart, P., Geibel, C., Steglich, F., Tokiwa, Y.   +4 more
arxiv   +4 more sources

Electronic nematicity and its relation to quantum criticality in Sr_3Ru_2O_7 studied by thermal expansion [PDF]

Phys. Status Solidi B 250 (2013) 450, 2012
We report high-resolution measurements of the in-plane thermal expansion anisotropy in the vicinity of the electronic nematic phase in Sr$_3$Ru$_2$O$_7$ down to very low temperatures and in varying magnetic field orientation. For fields applied along the c-direction, a clear second-order phase transition is found at the nematic phase, with critical ...
Gegenwart, P., Maeno, Y., Perry, R. S., Stingl, C.   +3 more
arxiv   +5 more sources

Anisotropy of the low-temperature magnetostriction of Sr3Ru2O7 [PDF]

, 2009
We use high-resolution capacitive dilatometry to study the low-temperature linear magnetostriction of the bilayer ruthenate Sr$_3$Ru$_2$O$_7$ as a function of magnetic field applied perpendicular to the ruthenium-oxide planes ($B\parallel c$). The relative length change $\Delta L(B)/L$ is detected either parallel or perpendicular to the c-axis close to
Gegenwart, P., Maeno, Y., Perry, R. S., Stingl, C.   +3 more
arxiv   +5 more sources