J. B. Betts

Quantum Phase Transition in the Normal State of High-Tc Cuprates at Optimum Doping (2007)

Balakirev, F. F., Betts, J. B., Migliori, A., Tsukada, I., Ando, Yoichi, Boebinger, G. S.

By using a 60 T magnetic field to suppress superconductivity in La2-pSrpCuO4, (LSCO) we reveal an anomalous peak in the Hall number, located at optimum doping and developing at temperatures below the...

Using magnetostriction to measure the spin-spin correlation function and magnetoelastic coupling in the quantum magnet NiCl$_2$-4SC(NH$_2$)$_2$ (2007)

Zapf, V. S., Correa, V. F., Sengupta, P., Batista, C. D., Tsukamoto, M., Kawashima, N., ...

We report a method for determining the spatial dependence of the magnetic exchange coupling, $dJ/dr$, from magnetostriction measurements of a quantum magnet. The organic Ni $S = 1$ system...

Ferromagnetism and possible heavy fermion behavior in single crystals of NdOs$_4$Sb$_{12}$ (2004)

Yuhasz, W. M., Butch, N. P., Frederick, N. A., Sayles, T. A., Jeffries, J. R., ...

Single crystals of the filled-skutterudite compound NdOs$_4$Sb$_{12}$ have been investigated by means of electrical resistivity, magnetization, and specific heat measurements. The NdOs$_4$Sb$_{12}$...

Heavy Fermion Behavior, Crystalline Electric Field Effects, and Weak Ferromagnetism in SmOs_{4}Sb_{12} (2004)

Yuhasz, W. M., Frederick, N. A., Butch, N. P., Taylor, B. J., Sayles, T. A., ...

The filled skutterudite compound SmOs_{4}Sb_{12} was prepared in single crystal form and characterized. The SmOs_{4}Sb_{12} crystals have the LaFe_{4}P_{12}-type structure with lattice parameter a =...

High magnetic field thermal-expansion and elastic properties of CeRhIn$_5$ (2004)

Correa, V. F., Okraku, W. E., Betts, J. B., Migliori, A., Sarrao, J. L., Lacerda, A. H.

We report high magnetic field thermal-expansion and magnetostriction results on CeRhIn$_5$ single crystals. Several transitions, both first and second order, are observed when the field is applied...

Examination of the c-axis resistivity of Bi_{2}Sr_{2-x}La_xCuO_{6+\delta} in magnetic fields up to 58 T (2004)

Ono, S., Ando, Yoichi, Balakirev, F. F., Betts, J. B., Boebinger, G. S.

We measure the magnetic-field dependence of the c-axis resistivity, \rho_c(H), in a series of Bi_{2}Sr_{2-x}La_xCuO_{6+\delta} (BSLCO) single crystals for a wide range of doping using pulsed magnetic...

Spin reorientation and in-plane magnetoresistance of lightly doped La_{2-x}Sr_{x}CuO_{4} in magnetic fields up to 55 T (2004)

Ono, S., Komiya, Seiki, Lavrov, A. N., Ando, Yoichi, Balakirev, F. F., Betts, J. B., ...

The magnetoresistance (MR) in the in-plane resistivity is measured in magnetic fields up to 55 T in lightly doped La_{2-x}Sr_{x}CuO_{4} in the N\'eel state (x = 0.01) and in the spin-glass state (x =...

Quantum Phase Transitions in a Cuprate Superconductor Bi_{2}Sr_{2-x}La_{x}CuO_{6+\delta} (2004)

Ando, Yoichi, Ono, S., Sun, X. F., Takeya, J., Balakirev, F. F., Betts, J. B., ...

To elucidate a quantum phase transition (QPT) in Bi_2Sr_{2-x}La_xCuO_{6+\delta}, we measure charge and heat transport properties at very low temperatures and examine the following characteristics for...

Low-frequency Einstein mode in the zero-expansion material YbGaGe (2003)

Drymiotis, F. R., Lawes, G., Migliori, A., Ledbetter, H., Betts, J. B., Schmiedeshoff, G. M., ...

This paper was withdrawn by the authors.

Experimental electronic heat capacities of $\alpha-$ and $\delta-$Plutonium; heavy-fermion physics in an element (2003)

Lashley, J. C., Singleton, J., Migliori, A., Betts, J. B., Fisher, R. A., Smith, J. L., ...

We have measured the heat capacities of $\delta-$Pu$_{0.95}$Al$_{0.05}$ and $\alpha-$Pu over the temperature range 2-303 K. The availability of data below 10 K plus an estimate of the phonon...

Effects of unreacted Mg impurities on the transport properties of MgB2 (2002)

Jung, C. U., Kim, Heon-Jung, Park, Min-Seok, Kim, Mun-Seog, Kim, J. Y., Du, Zhonglian, ...

We synthesized polycrystalline MgB2 from a stoichiometric mixture of Mg and the 11 B isotope under different conditions. All the samples showed bulk superconductivity with Tc = 38~39 K. The samples...

Metal-to-Insulator Crossover in the Low-Temperature Normal State of Bi_{2}Sr_{2-x}La_{x}CuO_{6+\delta} (2000)

Ono, S., Ando, Yoichi, Murayama, T., Balakirev, F. F., Betts, J. B., Boebinger, G. S.

We measure the normal-state in-plane resistivity of La-doped Bi-2201 single crystals at low temperatures by suppressing superconductivity with 60-T pulsed magnetic fields. With decreasing hole...

Unconventional Transition from Metallic to Insulating Resistivity in the Spin-ladder Compound (Sr,Ca)$_{14}$Cu$_{24}$O$_{41}$ (1998)

Balakirev, F. F., Betts, J. B., Boebinger, G. S., Motoyama, N., Eisaki, H., Uchida, S.

Spin-ladder compounds make interesting analogs of the high-temperature superconductors, because they contain layers of nearly one-dimensional "ladders" consisting of a square array of copper and...