Superconductivity induced by Ni doping in BaFe$_2$As$_2$ (2008)
Li, L. J., Wang, Q. B., Luo, Y. K., Chen, H., Tao, Q., Li, Y. K., ...
A series of 122 phase BaFe$_{2-x}$Ni$_x$As$_2$ ($x$ = 0, 0.05, 0.1, 0.16, 0.2) single crystals were grown by self flux method and a dome-like Ni doping dependence of superconducting transition...
Effect of Co doping on superconductivity and transport properties in SmFe$_{1-x}$Co$_{x}$AsO (2008)
Li, Y. K., Lin, X., Zhu, Z. W., Chen, H., Wang, C., Li, L. J., ...
We investigate superconductivity and transport properties of Co doped SmFe$_{1-x}$Co$_{x}$AsO system. The antiferromagnetic (AFM) spin-density wave (SDW) order is rapidly suppressed by Co doping, and...
Li, Y. K., Lin, X., Wang, C., Li, L. J., Zhu, Z. W., Tao, Q., ...
We report Zn-doping effect in the parent and F-doped LaFeAsO oxy-arsenides. Slight Zn doping in LaFe$_{1-x}$Zn$_{x}$AsO drastically suppresses the resistivity anomaly around 150 K which is associated...
Nernst effect of the new iron-based superconductor LaO$_{1-x}$F$_{x}$FeAs (2008)
Zhu, Z. W., Xu, Z. A., Lin, X., Cao, G. H., Feng, C. M., Chen, G. F., ...
We report the first Nernst effect measurement on the new iron-based superconductor LaO$_{1-x}$F$_{x}$FeAs $(x=0.1)$. In the normal state, the Nernst signal is negative and very small. Below $T_{c}$ a...
Xu, X. F., Xu, Z. A., Liu, T. J., Fobes, D., Mao, Z. Q., Luo, J. L., ...
We present the first measurement on Nernst effect in the normal state of odd-parity, spin-triplet superconductor Sr$_{2}$RuO$_{4}$. Below 100 K, the Nernst signal was found to be negative, large,...
Competing magnetic fluctuations in Sr3Ru2O7 probed by Ti doping (2006)
Hooper, J., Fang, M. H., Zhou, M., Fobes, D., Dang, N., Mao, Z. Q., ...
We report the effect of nonmagnetic Ti4+ impurities on the electronic and magnetic properties of Sr3Ru2O7. Small amounts of Ti suppress the characteristic peak in magnetic susceptibility near 16 K...
Nernst Effect and Superconducting Fluctuations in Zn-doped YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ (2005)
Xu, Z. A., Shen, J. Q., Zhao, S. R., Zhang, Y. J., Ong, C. K.
We report the measurements of in-plane resistivity, Hall effect, and Nernst effect in Zn doped YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ epitaxial thin films grown by pulsed laser deposition technique. The...
Preparation and transport properties of non-hydrated Na$_{0.5}$CoO$_2$ single crystals (2004)
Chen, X. Z., Xu, Z. A., Cao, G. H., Shen, J. Q., Qiu, L. M., Gan, Z. H.
Single crystals of Na$_{0.5}$CoO$_2$ were obtained through a flux method followed by de-intercalation of sodium. The Na$_{0.5}$CoO$_2$ samples were found to be vulnerable to water in the air and a...
Tunneling spectroscopy of Na$_{x}$CoO$_2$ and Na$_{x}$CoO$_2$$\cdot$ yH$_2$O (2003)
Shan, L., Gao, H., Shi, Y. G., Yang, H. P., Lu, X. F., Cao, G. H., ...
The single electron tunneling spectroscopy on superconductor Na$_{x}$CoO$_2$$\cdot$ yH$_2$O and its starting compound Na$_{x}$CoO$_2$ has been studied with point-contact method. The spectra of...
Wen, H. H., Liu, Z. Y., Xu, Z. A., Weng, Z. Y., Zhou, F., Zhao, Z. X.
Nernst effect has been measured for an underdoped and an optimally doped $La_{2-x}Sr_xCuO_4$ single crystal with the magnetic field applied along different directions. For both samples, when $H \|$...
The high-field phase diagram of the cuprates derived from the Nernst effect (2002)
Wang, Yayu, Ong, N. P., Xu, Z. A., Kakeshita, T., Uchida, S., Bonn, D. A., ...
Measurements of the Nernst signal in the vortex-liquid state of the cuprates to high fields (33 T) reveal that vorticity extends to very high fields even close to the zero-field critical temperature...
Wang, Yayu, Xu, Z. A., Kakeshita, T., Uchida, S., Ono, S., Ando, Yoichi, ...
The diffusion of vortices down a thermal gradient produces a Josephson signal which is detected as the vortex Nernst effect. In a recent report, Xu et al., Nature 406, 486 (2000), an enhanced Nernst...
Zhang, Y., Ong, N. P., Xu, Z. A., Gagnon, R., Taillefer, L.
The Wiedemann-Franz (WF) ratio compares the thermal and electrical conductivities in a metal. We describe a new way to determine its value, based on the thermal Hall conductivity. The technique is...
Xu, Z. A., Ong, N. P., Noda, T., Eisaki, H., Uchida, S.
The Nd-doped cuprate La_{2-y-x}Nd_ySr_xCuO_4 displays a first-order phase transition at T_d (= 74 K for x=0.10, y = 0.60) to a low-temperature tetragonal (LTT) phase. A magnetic field H applied ||...
Thermal Conductivity as a Probe of Quasi-Particles in the Cuprates (1999)
Ong, N. P., Krishana, K., Zhang, Y., Xu, Z. A.
In underdoped YBa_2Cu_3O_x (x=6.63), the low-T thermal conductivity Kappa_xx varies steeply with field B at small B, and saturates to a nearly field-independent value at high fields. The simple...
Quasiparticle thermal Hall angle and magnetoconductance in YBa_2Cu_3O_x (1999)
Krishana, K., Ong, N. P., Zhang, Y., Xu, Z. A., Gagnon, R., Taillefer, L.
We present a way to extract the quasiparticle (qp) thermal conductivity Kappa_e and mean-free-path in YBa_2Cu_3O_x, using the thermal Hall effect and the magnetoconductance of Kappa_e. The results...
Effect of the pseudogap on the Hall conductivity in underdoped YBa_2Cu_3O_6+x (1999)
Xu, Z. A., Zhang, Y., Ong, N. P.
In underdoped YBa_2Cu_3O_x (YBCO) with x = 6.63, the opening of the pseudogap at T^* ~ 160 K has a strong effect on the Hall angle tan(theta). While the Hall response is significantly reduced, the...