Goko, T., Aczel, A. A., Baggio-Saitovitch, E., Bud'ko, S. L., Canfield, P. C., Carlo, J. P., ...
The recent discovery and subsequent developments of FeAs-based superconductors have presented novel challenges and opportunities in the quest for superconducting mechanisms in correlated-electron...
Determination of anisotropic Hc2 up to 45 T in (Ba{0.55}$K{0.45})Fe2As2 single crystals (2008)
Altarawneh, M., Collar, K., Mielke, C. H., Ni, N., Bud'ko, S. L., Canfield, P. C.
The magnetoresistance and the radio frequency penetration depth was measured in the superconductor (Ba$_{0.55}$K$_{0.45}$)Fe$_{2}$As$_{2}$ under pulsed and static magnetic fields extending to 46...
Squeezing the magnetism out of superconducting CaFe2As2 (2008)
Kreyssig, A., Green, M. A., Lee, Y., Samolyuk, G. D., Zajdel, P., Lynn, J. W., ...
The discovery of pressure-induced superconductivity in CaFe2As2 has opened an exciting new avenue to investigate the relationship between magnetism, superconductivity, and the role of lattice...
Lattice and magnetic instabilities in CaFe2As2: A single crystal neutron diffraction study (2008)
Goldman, A. I., Argyriou, D. N., Ouladdiaf, B., Chatterji, T., Kreyssig, A., Nandi, S., ...
Neutron diffraction measurements of a high quality single crystal of CaFe2As2 are reported. A sharp transition was observed between the high temperature tetragonal and low temperature orthorhombic...
Torikachvili, M. S., Ni, N., Bud'ko, S. L., Canfield, P. C.
The effects of pressure up to $\sim 20$ kbar, on the structural phase transition of lightly Sn-doped BaFe$_2$As$_2$, as well as on the superconducting transition temperature and upper critical field...
Kondo, Takeshi, Santander-Syro, A. F., Copie, O., Liu, Chang, Tillman, M. E., Mun, E. D., ...
We use angle resolved photoemission spectroscopy (ARPES) to study the momentum dependence of the superconducting gap in NdFeAsO1-xFx single crystals. We find that the Gamma hole pocket is fully...
First order structural phase transition in CaFe$_2$As$_2$ (2008)
Ni, N., Nandi, S., Kreyssig, A., Goldman, A. I., Mun, E. D., Bud'ko, S. L., ...
CaFe$_2$As$_2$ has been synthesized and found to form in the tetragonal, ThCr$_2$Si$_2$ structure with lattice parameters $a = 3.912(68) \AA$ and $c = 11.667(45) \AA$. Upon cooling through 170 K,...
The Fermi surface of Ba(1-x)K(x)Fe2As2 and its evolution with doping (2008)
Liu, C., Samolyuk, G. D., Lee, Y., Ni, N., Kondo, T., Santander-Syro, A. F., ...
We use angle-resolved photoemission spectroscopy (ARPES) to investigate the electronic properties of the newly discovered iron-arsenic superconductor, Ba(1-x)K(x)Fe2As2 and non-supercondcuting...
Structural transition and anisotropic properties of single crystalline SrFe2As2 (2008)
Kreyssig, A., Nandi, S., Ni, N., Bud'ko, S. L., Kracher, A., ...
Plate-like single crystals of SrFe2As2 as large as 3x3x0.5 mm3 have been grown out of Sn flux. The SrFe2As2 single crystals show a structural phase transition from a high temperature tetragonal phase...
Prozorov, R., Vannette, M. D., Law, S. A., Bud'ko, S. L., Canfield, P. C.
Tunnel-diode resonator technique was used to study crystals of ferromagnetic re-entrant superconductor, ErRh$_{4}$B$_{4}$. At the boundary between ferromagnetism (FM) and superconductivity (SC),...
Ni, N., Bud'ko, S. L., Kreyssig, A., Nandi, S., Rustan, G. E., Goldman, A. I., ...
Single crystals of BaFe$_2$As$_2$ and (Ba$_{0.55}$K$_{0.45}$)Fe$_2$As$_2$ have been grown out of excess Sn with 1% or less incorporation of solvent. The crystals are exceptionally micaceous, are...
Jia, Shuang, Ni, Ni, Samolyuk, G. D., Safa-Sefat, A., Dennis, K., Ko, Hyunjin, ...
Magnetization, resistivity and specific heat measurements were performed on the solution-grown, single crystals of six GdT$_2$Zn$_{20}$ (T = Fe, Ru, Os, Co, Rh and Ir) compounds, as well as their Y...
Bud'ko, S L, Law, S A, Canfield, P C, Samolyuk, G D, Torikachvili, M S, Schmiedeshoff, G M
Data on temperature-dependent, anisotropic thermal expansion in pure and doped RAgSb2 (R = Y, Sm, La) single crystals are presented. Using the Ehrenfest relation and heat capacity measurements,...
Bud'ko, S L, Frederick, J C, Mun, E D, Canfield, P C, Schmiedeshoff, G M
We present thermal expansion and longitudinal magnetostriction data for cubic RAl3 (R = Tm, Yb, Lu) single crystals. The thermal expansion coefficient for YbAl3 is consistent with an intermediate...
Pauli Paramagnetic Effects on Vortices in Superconducting TmNi2B2C (2007)
DeBeer-Schmitt, L., Eskildsen, M. R., Ichioka, M., Machida, K., Jenkins, N., Dewhurst, C. D., ...
The magnetic field distribution around the vortices in TmNi2B2C in the paramagnetic phase was studied experimentally as well as theoretically. The vortex form factor, measured by small-angle neutron...
Jia, S., Ni, Ni, Bud'ko, S. L., Canfield, P. C.
Single crystals of the dilute, rare earth bearing, pseudo-ternary series, Gd_xY_{1-x}Fe_2Zn_{20} were grown out of Zn-rich solution. Measurements of magnetization, resistivity and heat capacity on...
Torikachvili, M. S., Bud'ko, S. L., Law, S. A., Tillman, M. E., Mun, E. D., Canfield, P. C.
The intermetallic compound LaAgSb2 displays two charge-density-wave (CDW) transitions, which were detected with measurements of electrical resistivity (rho), magnetic susceptibility, and X-ray...
Veschunov, I. S., Vinnikov, L. Ya., Bud'ko, S. L., Canfield, P. C.
The magnetic flux structure in the basal plane, (001), of single crystals of superconducting (R = Er) and non-superconducting (R = Tb) RNi$_2$B$_2$C was studied by high resolution Bitter decoration...
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...
Conduction electron spin-lattice relaxation time in the MgB2 superconductor (2007)
Simon, F., Murányi, F., Fehér, T., Jánossy, A., Forró, L., Petrovic, C., ...
The spin-lattice relaxation time, $T_{1}$, of conduction electrons is measured as a function of temperature and magnetic field in MgB$_2$. The method is based on the detection of the $z$ component of...
Radio-frequency magnetic response of vortex lattices undergoing structural transformations (2007)
Prozorov, R., Kogan, V. G., Vannette, M D., Bud'ko, S. L., Canfield, P. C.
We report a clear anomaly in the rf response of a tunnel-diode resonator measured in borocarbide crystals in dc fields along the $c-$axis. We associate the anomaly in the dynamic magnetic...
Thermal expansion and effect of pressure on superconductivity in CuxTiSe2 (2007)
Bud'ko, S. L., Canfield, P. C., Morosan, E., Cava, R. J., Schmiedeshoff, G. M.
We report measurements of thermal expansion on a number of polycrystalline CuxTiSe2 samples corresponding to the parts of x - T phase diagram with different ground states, as well as the pressure...
Goddard, P. A., Singleton, J., Lima-Sharma, A. L., Morosan, E., Blundell, S. J., Bud'ko, S. L., ...
TmAgGe is an antiferromagnet in which the spins are confined to distorted kagome-like planes at low temperatures. We report angle-dependent measurements of the magnetization $M$ in fields of up to 55...
Thermal Expansion and Magnetostriction of the Ising Antiferromagnet TbNi2Ge2 (2006)
Schmiedeshoff, G. M., Hollen, S. M., Bud'ko, S. L., Canfield, P. C.
We have measured the linear thermal expansion and magnetostriction of the Ising antiferromagnet TbNi2Ge2 along its c-axis from room temperature to 2 K and in magnetic fields to 14 T. We find a...
A versatile and compact capacitive dilatometer (2006)
Schmiedeshoff, G. M., Lounsbury, A. W., Luna, D. J., Tracy, S. J., Schramm, A. J., Tozer, S. W., ...
We describe the design, construction, calibration, and operation of a relatively simple differential capacitive dilatometer suitable for measurements of thermal expansion and magnetostriction from...
Torikachvili, M. S., Jia, S., Mun, E. D., Hannahs, S. T., Black, R. C., Neils, W. K., ...
Heavy fermion compounds represent one of the most strongly correlated forms of electronic matter and give rise to low temperature states that range from small moment ordering to exotic...
Bud'ko, S. L., Schmiedeshoff, G. M., Canfield, P. C.
We present anisotropic thermal expansion measurements on single crystalline ErNi2B2C. All three, superconducting, antiferromagnetic and weak ferromagnetic phase transitions are unambiguously...
Law, S. A., Bud'ko, S. L., Canfield, P. C.
Temperature and applied magnetic field dependent magnetization measurements on 34 single crystalline samples of (R, R',R''...)Ni2Ge2 compounds (R, R', R'', etc. being primarily Gd-Lu, Y), were made....
Li, J., Vaknin, D., Bud'ko, S. L., Canfield, P. C., Pal, D., Eskildsen, M. R., ...
X-ray diffraction studies of fine polycrystalline samples of MgB$_2$ in the superconducting state reveal that crystals orient with their \emph{c}-axis in a plane normal to the direction of the...
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....
Jia, S., Bud'ko, S. L., Samolyuk, G. D., Canfield, P. C.
The RFe$_2$Zn$_{20}$ series manifests strongly correlated electron behavior for the non-magnetic R = Y member and remarkably high temperature, ferromagnetic ordering ($T_C$ = 86 K) for the local...
Kogan, V. G., Prozorov, R., Bud'ko, S. L., Canfield, P. C., Thompson, J. R., Karpinski, J., ...
The field dependence of the vortex core size $\xi(B)$ is incorporated in the London model, in order to describe reversible magnetization $M(B,T)$ for a number of materials with large Ginzburg-Landau...
Tokiwa, Y., Pikul, A., Gegenwart, P., Steglich, F., Bud'ko, S. L., Canfield, P. C.
We present temperature and field dependent heat capacity and magnetization data taken at temperatures down to 50 mK and in an applied magnetic field up to 11.5 Tesla for YbAgGe, a heavy-fermion...
Direct observation of Fe spin reorientation in single crystalline YbFe6Ge6 (2005)
Avila, M. A., Takabatake, T., Takahashi, Y., Bud'ko, S. L., Canfield, P. C.
We have grown single crystals of YbFe6Ge6 and LuFe6Ge6 and characterized their anisotropic behaviour through low field magnetic susceptibility, field-dependent magnetization, resistivity and heat...
Samolyuk, G. D., Bud'ko, S. L., Morosan, E., Antropov, V. P., Canfield, P. C.
We present anisotropic, zero applied magnetic field, temperature dependent resistivity measurements on hexagonal, non-magnetic, YPtIn and LuAgGe single crystals. For these materials the in-plane...
Field-Dependent Hall Effect in Single Crystal Heavy Fermion YbAgGe below 1K (2005)
Bud'ko, S. L., Zapf, V., Morosan, E., Canfield, P. C.
We report the results of a low temperature (T >= 50 mK) and high field (H 0. At the base temperature, the functional form of the field-dependent Hall coefficient is field direction dependent and...
Effects of Neutron Irradiation on Carbon Doped MgB2 Wire Segments (2005)
Wilke, R. H. T., Bud'ko, S. L., Canfield, P. C., Finnemore, D. K., Suplinskas, Raymond J., Farmer, J., ...
We have studied the evolution of superconducting and normal state properties of neutron irradiated Mg(B$_{.962}$C$_{.038}$)$_2$ wire segments as a function of post exposure annealing time and...
Field-induced non-Fermi-liquid resistivity of stoichiometric YbAgGe single crystals (2005)
Niklowitz, P. G., Knebel, G., Flouquet, J., Bud'ko, S. L., Canfield, P. C.
We have investigated hexagonal YbAgGe down to 70 mK by measuring the magnetic-field and temperature dependence of the resistivity rho of single crystals in fields up to 14 T. Our results extend the...
Superconducting and Normal State Properties of Neutron Irradiated MgB2 (2005)
Wilke, R. H. T., Bud'ko, S. L., Canfield, P. C., Famer, J., Hannahs, S. T.
We have performed a systematic study of the evolution of the superconducting and normal state properties of neutron irradiated MgB$_2$ wire segments as a function of fluence and post exposure...
Synthesis of Mg(B$_{1-x}$C$_x$)$_2$ Powders (2005)
Wilke, R. H. T., Bud'ko, S. L., Canfield, P. C., Finnemore, D. K., Hannahs, S. T.
We have synthesized bulk Mg(B$_{1-x}$C$_x$)$_2$ from a mixture of elemental Mg, B, and the binary compound B$_4$C. Carbon incorporation was dramatically improved by a two step reaction process at an...
Magnetic field-induced quantum critical point in YbPtIn and YbPt$_{0.98}$In single crystals (2005)
Morosan, E., Bud'ko, S. L., Mozharivskyj, Y. A., Canfield, P. C.
Detailed anisotropic (H$\parallel$ab and H$\parallel$c) resistivity and specific heat measurements were performed on online-grown YbPtIn and solution-grown YbPt$_{0.98}$In single crystals for...
Kondo Insulator description of spin state transition in FeSb2 (2005)
Petrovic, C., Lee, Y., Vogt, T., Lazarov, N. Dj., Bud'ko, S. L., Canfield, P. C.
The thermal expansion and heat capacity of FeSb2 at ambient pressure agrees with a picture of a temperature induced spin state transition within the Fe t_{2g} multiplet. However, high pressure powder...
Samuely, P., Szabo, P., Canfield, P. C., Bud'ko, S. L.
In a recent Physical Review Letter Kortus et al. claim that the observed decrease of $T_c$ in Al and C doped MgB$_2$ samples is mainly due to the band filling by the electron doping but for a fuller...
Bud'ko, S. L., Canfield, P. C.
The long-time temperature drift in a commercial Quantum Design MPMS SQUID magnetometer was evaluated using time-dependent magnetization measurements of Gd$_2$O$_3$. In contrast to earlier claims, the...
Morosan, E., Bud'ko, S. L., Canfield, P. C.
Single crystals of RPtIn, $R~=$ Y, Gd - Lu were grown out of In-rich ternary solution. Powder X-ray diffraction data on all of these compounds were consistent with the hexagonal ZrNiAl-type structure...
Superconductivity in MgB_2 doped with Ti and C (2004)
Wilke, R. H. T., Bud'ko, S. L., Canfield, P. C., Kramer, M. J., Wu, Y. Q., Finnemore, D. K., ...
Measurements of the superconducting upper critical field, H_{c2}, and critical current density, J_c, have been carried out for MgB_2 doped with Ti and/or C in order to explore the problems...
Bud'ko, S. L., Wilke, R. H. T., Angst, M., Canfield, P. C.
Measurements of the superconducting transition temperatures for Al-doped, C-doped and neutron-damaged-annealed MgB2 samples under pressure up to ~8 kbar are presented. The dT_c/dP values change...
Inelastic neutron scattering study of single crystal heavy fermion YbAgGe (2004)
Fak, B., McMorrow, D. F., Niklowitz, P. G., Raymond, S., Ressouche, E., Flouquet, J., ...
Single crystals of the heavy-fermion compound YbAgGe have been studied by neutron scattering. The magnetic ordering occurring below T1=0.5 K is characterized by a commensurate propagation vector...
Angst, M., Bud'ko, S. L., Wilke, R. H. T., Canfield, P. C.
The temperature dependence of the upper critical field, Hc2, for both field directions in partially substituted polycrystalline MgB2 was determined. Whereas the suppression of Tc is similar for...
Angular dependent planar metamagnetism in the hexagonal compounds TbPtIn and TmAgGe (2004)
Morosan, E., Bud'ko, S. L., Canfield, P. C.
Detailed magnetization measurements, M(T,H,theta), were performed on single crystals of TbPtIn and TmAgGe (both members of the hexagonal Fe_2P/ZrNiAl structure type), for the magnetic field H applied...
Anisotropic Hall Effect in Single Crystal Heavy Fermion YbAgGe (2004)
Bud'ko, S. L., Morosan, E., Canfield, P. C.
Temperature- and field-dependent Hall effect measurements are reported for YbAgGe, a heavy fermion compound exhibiting a field-induced quantum phase transition, and for two other closely related...
Anisotropy and internal field distribution of MgB2 in the mixed state at low temperatures (2004)
Angst, M., Di Castro, D., Eshchenko, D. G., Khasanov, R., Kohout, S., Savic, I. M., ...
Magnetization and muon spin relaxation on MgB2 were measured as a function of field at 2 K. Both indicate an inverse-squared penetration depth strongly decreasing with increasing field H below about...
Holanova, Z., Szabo, P., Samuely, P., Wilke, R. H. T., Bud'ko, S. L., Canfield, P. C.
Point-contact measurements on the carbon-substituted Mg(B$_{1-x}$C$_x$)$_2$ filament/powder samples directly reveal a retention of the two superconducting energy gaps in the whole doping range from...
Critical fluctuations in the carbon-doped magnesium diboride (2004)
Hol'anova, Z., Kačmarčik, J., Szabó, P., Samuely, P., Sheikin, I., Ribeiro, R. A., ...
Carbon doping of magnesium diboride resulting in the Mg(B0.9C0.1)(2) stoichiometry leads to the superconducting transition temperature T-c = 22 K which is about 17 K less than in the pure MgB2. We...
Wilke, R. H. T., Bud'ko, S. L., Canfield, P. C., Finnemore, D. K., Suplinskas, Raymond J., Hannahs, S. T.
The upper critical field, $H_{c2}$, of Mg(B$_{1-x}$C$_x$)$_2$ has been measured in order to probe the maximum magnetic field range for superconductivity that can be attained by C doping. Carbon doped...
The Role of Nonlocality in the Pinning Properties of Borocarbides Materials (2003)
Silhanek, A. V., Thompson, J. R., Civale, L., Bud'ko, S. L., Canfield, P.
An experimental review on the influence of nonlocal electrodynamics in the vortex pinning properties of non-magnetic borocarbide superconductors is presented. We show that the pinning force density...
Avila, M. A., Wu, Y. Q., Condron, C. L., Bud'ko, S. L., Kramer, M., Miller, G. J., ...
We address the nature of the ligandal disorder leading to local redistributions of Kondo temperatures, manifested as annealing-induced changes in the transport behavior of the heavy fermion system...
Thermodynamic and transport properties of RAgGe (R=Tb-Lu) single crystals (2003)
Morosan, E., Bud'ko, S. L., Canfield, P. C., Torikachvili, M. S., Lacerda, A. H.
Single crystals of the title compounds were grown out of an AgGe-rich ternary solution. Powder x-ray diffraction data confirmed the hexagonal AlNiZr-type structure ($P\bar{6}2m$ space group), an...
Magnetic Field Induced Non-Fermi-Liquid Behavior in YbAgGe Single Crystal (2003)
Bud'ko, S. L., Morosan, E. Q. T., Canfield, P. C.
Detailed anisotropic resistivity and heat capacity measurements down to ~0.4 K and up to 140 kOe are reported for a single crystalline YbAgGe. Based on these data YbAgGe, a member of the hexagonal...
Absence of a boron isotope effect in the magnetic penetration depth of MgB$_{2}$ (2003)
Di Castro, D., Angst, M., Eshchenko, D. G., Khasanov, R., Roos, J., Savić, I. M., ...
The magnetic penetration depth $\lambda(0)$ in polycrystalline MgB$_{2}$ for different boron isotopes ($^{10}$B/$^{11}$B) was investigated by transverse field muon spin rotation. No boron isotope...
Lock-in transitions in ErNi2B2C and TbNi2B2C (2003)
Detlefs, C., Song, C., Brown, S., Thompson, P., Kreyssig, A., Bud'ko, S. L., ...
High resolution x-ray magnetic scattering has been used to determine the variation with temperature of the magnetic modulation vector, tau, in ErNi2B2C and TbNi2B2C to study the interplay between the...
Anisotropic magnetization, specific heat and resistivity of RFe2Ge2 single crystals (2003)
Avila, M. A., Bud'ko, S. L., Canfield, P. C.
We have grown RFe2Ge2 single crystals for R = Y and ten members of the lanthanide series (Pr, Nd, Sm, Gd-Tm, Lu) using Sn flux as the solvent. The method yields clean, high quality crystal plates as...