Lu, Xin, Park, W. K., Yuan, H. Q., Chen, G. F., Luo, G. L., Wang, N. L., ...
Point-contact Andreev reflection spectroscopy (PCARS) is applied to investigate the gap structure in iron pnictide single crystal superconductors of the AFe_2As_2 (A=Ba, Sr) family ("Fe-122"). The...
Fang, M. H., Yang, J. H., Balakirev, F. F., Kohama, Y., Singleton, J., Qian, B., ...
We have determined the resistive upper critical field Hc2 for single crystals of the superconductor Fe1.11Te0.6Se0.4 using pulsed magnetic fields of up to 60T. A rather high zero-temperature upper...
Competing energy scales in iron-based layered (Ba,K)Fe2As2 superconductors (2008)
Chia, Elbert E. M., Talbayev, D., Yuan, H. Q., Park, T., Thompson, J. D., ...
Recent discovery of superconductivity in Fe-based compounds, the only class of non-cuprate materials with superconducting transition temperatures (Tc) larger than 40 K, has generated tremendous...
Nearly Isotropic superconductivity in (Ba,K)Fe2As2 (2008)
Yuan, H. Q., Singleton, J., Balakirev, F. F., Baily, S. A., Chen, G. F., Luo, J. L., ...
Superconductivity was recently observed in the iron-arsenic-based compounds with a superconducting transition temperature (Tc) as high as 56K [1-7], naturally raising comparisons with the high Tc...
Superconducting properties of Fe-based layered superconductor LaO$_{0.9}$F$_{0.1-\delta}$FeAs (2008)
Chen, G. F., Li, Z., Li, G., Zhou, J., Wu, D., Dong, J., ...
We have employed a new route to synthesize single phase F-doped LaOFeAs compound and confirmed the superconductivity above 20 K in this Fe-based system. We show that the new superconductor has a...
Experimental evidence for unconventional BCS states in heavy-fermion metals (2008)
Steglich, F., Geibel, C., Grosche, F. M., Loewenhaupt, M., Stockert, O., Wirth, S., ...
Metallic State in Cubic FeGe Beyond Its Quantum Phase Transition (2007)
Pedrazzini, P., Wilhelm, H., Jaccard, D., Jarlborg, T., Schmidt, M., Hanfland, M., ...
Mochizuki, Masahito, Yuan, H. Q., Ogata, Masao
Several thermodynamic measurements for the cobaltate superconductor, NaxCoO2.yH2O, have so far provided results inconsistent with each other. In order to solve the discrepancies, we microscopically...
Quantum phase transition in the heavy-fermion compound YbIr$_2$Si$_2$ (2006)
Yuan, H. Q., Nicklas, M., Hossain, Z., Geibel, C., Steglich, F.
We investigate the pressure-temperature phase diagram of YbIr$_2$Si$_2$ by measuring the electrical resistivity $\rho(T)$. In contrast to the widely investigated YbRh$_2$Si$_2$, YbIr$_2$Si$_2$ is a...
Magnetic transition and magnetic structure of Sr4Ru3O10 (2006)
Bao, Wei, Mao, Z. Q., Zhou, M., Hooper, J., Lynn, J. W., Freitas, R. S., ...
We have investigated the magnetic transition and magnetic structure of triple-layered ruthenate Sr4Ru3O10 directly using neutron scattering techniques. Only one ferromagnetic phase is observed, and...
Metallic State in Cubic FeGe beyond its Quantum Phase Transition (2006)
Pedrazzini, P., Wilhelm, H., Jaccard, D., Jarlborg, T., Schmidt, M., Hanfland, M., ...
We report on results of electrical resistivity and structural investigations on the cubic modification of FeGe under high pressure. The long-wavelength helical order ($T_C=280$ K) is suppressed at a...
Hidden Magnetism and Quantum Criticality in the Heavy Fermion Superconductor CeRhIn5 (2006)
Park, Tuson, Ronning, F., Yuan, H. Q., Salamon, M. B., Movshovich, R., Sarrao, J. L., ...
With understood exceptions, conventional superconductivity does not coexist with long-range magnetic order[1]. In contrast, unconventional superconductivity develops near a boundary separating...
Non-Fermi Liquid States in the Pressurized CeCu2(Si1-xGex)2 Systems: Two Critical Points (2006)
Yuan,H. Q., Grosche,F. M., Deppe,M., Sparn,G., Geibel,C., Steglich,F.
Non-Fermi Liquid States in the Pressurized CeCu2(Si1-xGex)2 System: Two Critical Points (2006)
Yuan, H. Q., Grosche, F. M., Deppe, M., Sparn, G., Geibel, C., Steglich, F.
Superconducting phases and quantum criticality in CeCu2Si2 (2006)
Sparn, G., Stockert, O., Grosche, F. M., Yuan, H. Q., Faulhaber, E., Geibel, C., ...
Quantum phase transition in the heavy-fermion compound YbIr2Si2 (2006)
Yuan, H. Q., Nicklas, M., Hossain, Z., Geibel, C., Steglich, F.
Yuan, H. Q., Agterberg, D. F., Hayashi, N., Badica, P., Vandervelde, D., Togano, K., ...
We investigate the order parameter of noncentrosymmetric superconductors Li$_2$Pd$_3$B and Li$_2$Pt$_3$B via the behavior of the penetration depth $\lambda(T)$. The low-temperature penetration depth...
A Penetration Depth Study on Li2Pd3B and Li2Pt3B (2005)
Yuan, H. Q., Vandervelde, D., Salamon, M. B., Badica, P., Togano, K.
In this paper we present a penetration depth study on the newly discovered superconductors Li$_2$Pd$_3$B and Li$_2$Pt$_3$B. Surprisingly, the low-temperature penetration depth $f(T)$ demonstrates...
Yuan, H. Q., Grosche, F. M., Deppe, M., Sparn, G., Geibel, C., Steglich, F.
In the archetypal strongly correlated electron superconductor CeCu$_2$Si$_2$ and its Ge-substituted alloys CeCu$_2$(Si$_{1-x}$Ge$_{x}$)$_2$ two quantum phase transitions -- one magnetic and one of so...
Interplay of superconductivity and structural phase transition in the clathrate Ba6Ge25 (2004)
Yuan,H. Q., Grosche,F. M., Carrillo-Cabrera,W., Pacheco,V., Sparn,G., Baenitz,M., ...
Effect of impurity scattering on the superconductivity of CeCu2Si2 (2004)
Yuan,H. Q., Grosche,F. M., Deppe,M., Geibel,C., Sparn,G., Steglich,F.
Interplay of superconductivity and structural phase transition in the clathrate Ba6Ge25 (2004)
Yuan, H. Q., Grosche, F. M., Carrillo-Cabrera, W., Pacheco, V., Sparn, G., Baenitz, M., ...
Effect of impurity scattering on the superconductivity of CeCu2Si2 (2004)
Yuan, H. Q., Grosche, F. M., Deppe, M., Geibel, C., Sparn, G., Steglich, F.
SEARCHING FOR QUANTUM PHASE TRANSITIONS IN NARROW-BAND METALS (2004)
Grosche, F. M., Moroni-Klementowicz, D., Burrell, R., Fort, D., Awaka, J., Nagata, S., ...
Observation of Two Distinct Superconducting Phases in CeCu2Si2 (2003)
Yuan,H. Q., Grosche,F. M., Deppe,M., Geibel,C., Sparn,G., Steglich,F.
PRESSURE EFFECT ON THE MAGNETISM AND SUPERCONDUCTIVITY IN SINGLE CRYSTAL CeCu2(Si0.9Ge0.1)2 (2003)
Yuan,H. Q., Deppe,M., Sparn,G., Grosche,F. M., Geibel,C., Steglich,F.
PRESSURE EFFECT ON THE MAGNETISM AND SUPERCONDUCTIVITY IN SINGLE CRYSTAL CeCu2(Si0.9Ge0.1)2 (2003)
Yuan, H. Q., Deppe, M., Sparn, G., Grosche, F. M., Geibel, C., Steglich, F.
Observation of Two Distinct Superconducting Phases in CeCu2Si2 (2003)
Yuan, H. Q., Grosche, F. M., Deppe, M., Geibel, C., Sparn, G., Steglich, F.
High-pressure studies on a new superconducting clathrate: Ba6Ge25 (2002)
Yuan,H. Q., Grosche,F. M., Carrillo-Cabrera,W., Paschen,S., Sparn,G., Baenitz,M., ...
The effect of pressure on the low-temperature states of the newly discovered clathrate Ba6Ge25 is investigated by means of measurements of the electrical resistivity. At ambient pressure, Ba6Ge25...
Chemical physics of metallic clathrates with low carrier concentration (2002)
Steglich,F., Bentien,A., Baenitz,M., Carrillo-Cabrera,W., Grosche,F. M., Langhammer,C., ...
We discuss physical properties of two metallic clathrate compounds with low carrier concentration: Eu8Ga16Ge30, the first clathrate known to date, for which the 'guest' sites are fully occupied by...
Pressure study on new superconducting germanium clathrates (2002)
Yuan,H. Q., Grosche,F. M., Carrillo-Cabrera,W., Paschen,S., Sparn,G., Baenitz,M., ...
We investigate the low temperature properties of the recently discovered clathrates Ba6Ge25 and Na2Ba4Ge25 by tuning both materials with hydrostatic pressure. At ambient pressure, Ba6Ge25 undergoes a...
Evolution of magnetic order in the Kondo system Ce2Ir3Ge5 under pressure (2002)
Yuan,H. Q., Hossain,Z., Grosche,F. M., Sparn,G., Geibel,C., Steglich,F., ...
The evolution of antiferromagnetic order in the Kondo system Ce2Ir3Ge5 was investigated by measurements of the electrical resistivity under hydrostatic pressure. At low pressure (p < 1.0 GPa), T-N =...
The Novel Superconducting Clathrates: Ba6Ge25 and Na2Ba4Ge25 (2002)
Yuan,H. Q., Grosche,F. M., Carrillo-Cabrera,W., Paschen,S., Langhammer,C., Sparn,G., ...
Chemical physics of metallic clathrates with low carrier concentration (2002)
Steglich, F., Bentien, A., Baenitz, M., Carrillo-Cabrera, W., Grosche, F. M., Langhammer, C., ...
We discuss physical properties of two metallic clathrate compounds with low carrier concentration: Eu8Ga16Ge30, the first clathrate known to date, for which the 'guest' sites are fully occupied by...
High-pressure studies on a new superconducting clathrate: Ba6Ge25 (2002)
Yuan, H. Q., Grosche, F. M., Carrillo-Cabrera, W., Paschen, S., Sparn, G., Baenitz, M., ...
The effect of pressure on the low-temperature states of the newly discovered clathrate Ba6Ge25 is investigated by means of measurements of the electrical resistivity. At ambient pressure, Ba6Ge25...
Pressure study on new superconducting germanium clathrates (2002)
Yuan, H. Q., Grosche, F. M., Carrillo-Cabrera, W., Paschen, S., Sparn, G., Baenitz, M., ...
We investigate the low temperature properties of the recently discovered clathrates Ba6Ge25 and Na2Ba4Ge25 by tuning both materials with hydrostatic pressure. At ambient pressure, Ba6Ge25 undergoes a...
Evolution of magnetic order in the Kondo system Ce2Ir3Ge5 under pressure (2002)
Yuan, H. Q., Hossain, Z., Grosche, F. M., Sparn, G., Geibel, C., Steglich, F., ...
The evolution of antiferromagnetic order in the Kondo system Ce2Ir3Ge5 was investigated by measurements of the electrical resistivity under hydrostatic pressure. At low pressure (p < 1.0 GPa), T-N =...
The Novel Superconducting Clathrates: Ba6Ge25 and Na2Ba4Ge25 (2002)
Yuan, H. Q., Grosche, F. M., Carrillo-Cabrera, W., Paschen, S., Langhammer, C., Sparn, G., ...
Superconductivity in the Filled Cage Compounds Ba6Ge25 and Ba4Na2Ge25 (2001)
Grosche,F. M., Yuan,H. Q., Carrillo-Cabrera,W., Paschen,S., Langhammer,C., Kromer,F., ...