Prozorov, R., Tillman, M. E., Mun, E. D., Canfield, P. C.
Magneto-optical imaging was used to study local magnetization in polycrystalline Nd(O$_{0.9}$F$_{0.1}$)FeAs. Individual crystallites up to $\sim200\times100\times30$ $\mu m^{3}$ in size could be...
Exotic (anti)ferromagnetism in single crystals of Pr6Ni2Si3 (2008)
Janssen, Y., Dennis, K. W., Prozorov, R., Canfield, P. C., McCallum, R. W.
The ternary intermetallic compound Pr6Ni2Si3, is a member of a structure series of compounds based on a triangular structure where the number of Pr atoms in the prism cross section can be...
Colossal Positive Magnetoresistance in a Doped Nearly Magnetic Semiconductor (2008)
Hu, Rongwei, Thomas, K. J., Lee, Y., Vogt, T., Choi, E. S., Mitrovic, V. F., ...
We report on a positive colossal magnetoresistance (MR) induced by metallization of FeSb$_{2}$, a nearly magnetic or "Kondo" semiconductor with 3d ions. We discuss contribution of orbital MR and...
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...
Direct observation of the high magnetic field effect on the Jahn-Teller state in TbVO4 (2007)
Detlefs, C., Duc, F., Kazei, Z. A., Vanacken, J., Frings, P., Bras, W., ...
We report the first direct observation of the influence of high magnetic fields on the Jahn-Teller (JT) transition in TbVO4. Contrary to spectroscopic and magnetic methods, X-ray diffraction directly...
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,...
Hydrostatic pressure study of single-crystalline UNi0.5Sb2 (2007)
Davis, B. K., Torikachvili, M. S., Mun, E. D., Frederick, J. C., Miller, G. J., Thimmaiah, S., ...
We studied single-crystals of the antiferromagnetic compound UNi0.5Sb2 (TN ~ 161 K) by means of measurements of magnetic susceptibility (chi), specific heat (Cp), and electrical resistivity (rho) at...
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...
Point-contact Andreev reflection spectroscopy of heavy-fermion-metal/superconductor junctions (2007)
Park, W. K., Stalzer, H., Sarrao, J. L., Thompson, J. D., Pham, L. D., Fisk, Z., ...
Our previous point-contact Andreev reflection studies of the heavy-fermion superconductor CeCoIn$_5$ using Au tips have shown two clear features: reduced Andreev signal and asymmetric background...
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...
Measson, M. -A., Braithwaite, D., Lapertot, G., Brison, J. -P., 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...
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...
Magnetic structures and crystal field in the heavy electron materials YbAgGe and YbPtIn (2007)
Bonville, P., Rams, M., Królas, K., Sanchez, J.-P., Canfield, P. C., Trovarelli, O., ...
A crystallographic phase transition within the magnetically ordered state of Ce_2Fe_17 (2006)
Kreyssig, A., Chang, S., Janssen, Y., Kim, J. -W., Nandi, S., Yan, J. Q., ...
X-ray diffraction experiments were performed on polycrystalline and single-crystal specimens of Ce$_{2}$Fe$_{17}$ at temperatures between 10 K and 300 K. Below $T_{\mathrm{t}}$ = 118$\pm$2 K,...
Magnetic phase diagram of Ce2Fe17 (2006)
Janssen, Y., Chang, S., Kreyssig, A., Kracher, A., Mozharivskyj, Y., Misra, S., ...
Rare-earth-based permanent-magnet materials rich in iron have relatively low ferromagnetic ordering temperatures. This is believed to be due to the presence of antiferromagnetic exchange...
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...
Szabo, P., Samuely, P., Hol'anova, Z., Bud'ko, S., Canfield, P. C., Marcus, J.
The two-band/two-gap superconductivity in aluminium and carbon doped MgB$_2$ has been addressed by the point-contact spectroscopy. Two gaps are preserved in all samples with $T_c's$ down to 22 K. The...
Phonon-induced quadrupolar ordering of the magnetic superconductor TmNi2B2C (2006)
N.H. Andersen, DESY Forschung Mit Photonen, J. Jensen, T.B.S. Jensen, M. V. Zimmermann, R. Pinholt, ...
Journal article
Magnetic and quadrupolar ordering in TmNi2B2C 2005-11-28 - 2005-12-02 (2006)
N.H. Andersen, DESY Forschung Mit Photonen, International Conference On Neutron Scattering 2005 Sydney ICNS2005 Australia, J. Jensen, T.B.S. Jensen, R. Pinholt, ...
Contribution to a conf. proceeding (journal)
Naugle, D. G., Belevtsev, B. I., Rathnayaka, K. D. D., Adegbenro, S. A., Canfield, P. C., Lee, S. -I.
The metamagnetic transitions in single-crystal rare-earth nickel borocarbide HoNi_{2}B_{2}C and ErNi_{2}B_{2}C have been studied at 1.9 K with a Quantum Design torque magnetometer. The critical...
Park, Jeong Young, Ogletree, D. Frank, Salmeron, Miquel, Ribeiro, R.A., Canfield, P.C., Jenks, C.J., ...
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...
A small sealed Ta crucible for thermal analysis of volatile metallic samples (2005)
Janssen, Y., Angst, M., Dennis, K. W., Canfield, P. C., McCallum, R. W.
Differential thermal analysis on metallic alloys containing volatile elements can be highly problematic. Here we show how measurements can be performed in commercial, small-sample, equipment without...
Local superconducting density of states of ErNi2B2C (2005)
Crespo, M., Suderow, H., Vieira, S., Bud'ko, S., Canfield, P. C.
We present local tunnelling microscopy and spectroscopy measurements at low temperatures in single crystalline samples of the magnetic superconductor ErNi2B2C. The electronic local density of states...
Phonon-induced quadrupolar ordering of the magnetic superconductor TmNi$_2$B$_2$C (2005)
Andersen, N. H., Jensen, J., Jensen, T. B. S., Zimmermann, M. V., Pinholt, R., Abrahamsen, A. B., ...
We present synchrotron x-ray diffraction studies revealing that the lattice of thulium borocarbide is distorted below T_Q = 13.5 K at zero field. T_Q increases and the amplitude of the displacements...
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...
Differential thermal analysis and solution growth of intermetallic compounds (2005)
Janssen, Y., Angst, M., Dennis, K. W., McCallum, R. W., Canfield, P. C.
To obtain single crystals by solution growth, an exposed primary solidification surface in the appropriate, but often unknown, equilibrium alloy phase diagram is required. Furthermore, an appropriate...
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...
Distinct order of Gd 4f and Fe 3d moments coexisting in GdFe4Al8 (2005)
Angst, M., Kreyssig, A., Janssen, Y., Kim, J. -W., Tan, L., Wermeille, D., ...
Single crystals of flux-grown tetragonal GdFe4Al8 were characterized by thermodynamic, transport, and x-ray resonant magnetic scattering measurements. In addition to antiferromagnetic order at TN ~...
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...
Unpaired Electrons in the Heavy-Fermion Superconductor CeCoIn_{5} (2005)
Tanatar, M. A., Paglione, Johnpierre, Nakatsuji, S., Hawthorn, D. G., Boaknin, E., Hill, R. W., ...
Thermal conductivity and specific heat were measured in the superconducting state of the heavy fermion material Ce_{1-x}La_{x}CoIn_{5}. With increasing impurity concentration x, the suppression of...
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...
YbGaGe: normal thermal expansion (2004)
Janssen, Y., Chang, S., Cho, B. K., Llobet, A., Dennis, K. W., McCallum, R. W., ...
We report evidence of the absence of zero thermal expansion in well-characterized high-quality polycrystalline samples of YbGaGe. High-quality samples of YbGaGe were produced from high-purity...
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...