Browsing by Author "Ross, Joseph H. Jr."

Now showing items 21-40 of 40

    • NMR relaxation and rattling phonons in type-I Ba8Ga16Sn30 clathrate 
      Zheng, Xiang; Rodriguez, Sergio Y.; Ross, Joseph H. Jr. (American Physical Society, 2011)
      Atomic motion of guest atoms inside semiconducting clathrate cages is considered an important source for glasslike thermal behavior. 69Ga and 71Ga nuclear magnetic resonance studies on type I Ba8Ga16Sn30 show a clear ...
    • NMR relaxation studies of electronic structure in NbSe3 
      Shi, Jianhui; Ross, Joseph H. Jr. (American Physical Society, 1992)
      NMR spin-lattice relaxation measurements of the Nb93 resonance for each Nb site were performed on an aligned, multicrystalline NbSe3 sample at different temperatures. Results are associated with local electron densities ...
    • NMR studies of NbSe3: Electronic structures, static charge-density-wave measurements, and observations of the moving charge-density wave 
      Ross, Joseph H. Jr.; Wang, Zhiyue; Slichter, Charles P. (American Physical Society, 1990)
      We describe a series of Nb93 NMR studies of the charge-density-wave (CDW) conductor NbSe3. Using an aligned, multicrystalline sample, we have measured the complete shift tensors for the three Nb sites in the normal state. ...
    • NMR Study of Ba8Cu5SixGe41-x Clathrate Semiconductors 
      Sirusi, Ali A.; Ross, Joseph H. Jr.; Yan, Xinlin; Paschen, Silke (Royal Society of Chemistry, 2015)
      We have performed 63Cu, 65Cu, and 137Ba NMR on Ba8Cu5SixGe41-x, a series of intermetallic clathrates known for their potential as thermoelectric materials, in order to investigate the electronic behavior of the samples. ...
    • NMR Study of Slow Atomic Motion in Sr8Ga16Ge30 Clathrate 
      Gou, Weiping; Li, Yang; Chi, Ji; Ross, Joseph H. Jr.; Beekman, M.; Nolas, G. S. (American Physical Society, 2005)
      The clathrates feature large cages of silicon, germanium, or tin, with guest atoms in the cage centers. Sr8Ga16Ge30 clathrate is interesting because of its thermoelectric efficiency, and its glasslike thermal conductivity ...
    • NMR study of the structure and motion of charge density waves in NbSe3 
      Ross, Joseph H. Jr.; Wang, Zhiyue; Slichter, Charles P. (American Physical Society, 1986)
      The authors report NMR measurements of the Nb93 resonance in the charge-density-wave (CDW) conductor NbSe3 on aligned, multicrystalline samples. They have observed the resonance with and without current flow in the sample ...
    • NMR study of trialuminide intermetallics 
      Lue, Chin-Shan; Chepin, Suchitra; Chepin, James; Ross, Joseph H. Jr. (American Physical Society, 1998)
      We present a systematic study of the DO22-structure trialuminide intermetallic alloys using 27Al NMR spectroscopy. The quadrupole splittings, Knight shifts, and spin-lattice relaxation times on Al3Ti, Al3V, Al3Nb, and Al3Ta ...
    • A nuclear magnetic resonance probe of group IV clathrates 
      Gou, Weiping (Texas A&M University, 2008-10-10)
      The clathrates feature large cages of silicon, germanium, or tin, with guest atoms in the cage centers. The group IV clathrates are interesting because of their thermoelectric efficiency, and their glasslike thermal ...
    • Pseudogap in Fe2VGa: NMR evidence 
      Lue, C. S.; Ross, Joseph H. Jr. (American Physical Society, 2001)
      We report the results of a 51V and 69Ga nuclear magnetic resonance (NMR) study of Fe2VGa at temperatures between 4 and 450 K. The presence of magnetic antisite defects is deduced from the NMR linewidth, which displays a ...
    • Semimetallic Behavior in Fe2VAl: NMR Evidence 
      Lue, Chin-Shan; Ross, Joseph H. Jr. (American Physical Society, 1998)
      We report the results of a 27Al and 51V nuclear magnetic resonance study of Fe2VAl at temperatures between 4 and 550 K. This material has been a subject of current interest due to indications of possible heavy fermion ...
    • Spin fluctuations in Al3V: An NMR study 
      Lue, Chin-Shan; Ross, Joseph H. Jr. (American Physical Society, 1999)
      We report the results of a nuclear magnetic resonance (NMR) study of Al3V at temperatures between 4 and 300 K. 51V and 27Al Knight shifts exhibit a Curie-Weiss behavior corresponding to an effective moment Peff≃0.32μB per ...
    • Spin glass behavior in FeAl2 
      Lue, C. S.; Oner, Y.; Naugle, D. G.; Ross, Joseph H. Jr. (American Institute of Physics, 2001)
      Magnetic and transport measurements indicate FeAl2 to be an ordered intermetallic spin glass, with canonical behavior including a susceptibility cusp at Tf=35K and frequency-dependent susceptibility below Tf. The field-cooled ...
    • Superconductivity and Magnetism in Silicon and Germanium Clathrates 
      Ross, Joseph H. Jr.; Li, Yang (Springer-Verlag US, 2009)
      Clathrates are materials containing closed polyhedral cages stacked to form crystalline frameworks. With Si, Ge, and Sn atoms populating these frameworks, a wide variety of electronic and vibrational properties can be ...
    • Superconductivity in gallium-substituted Ba8Si46 clathrates 
      Li, Yang; Zhang, Ruihong; Liu, Yang; Chen, Ning; Luo, Z. P.; Ma, Xingqiao; Cao, Guohui; Feng, Z. S.; Hu, Chia-Ren; Ross, Joseph H. Jr. (American Physical Society, 2007)
      We report a joint experimental and theoretical investigation of superconductivity in Ga-substituted type-I silicon clathrates. We prepared samples of the general formula Ba8Si46−xGax, with different values of x. We show ...
    • Synthesis, transport and magnetic properties of Ba-Co-Ge clathrates 
      Sirusi, Ali A.; Ross, Joseph H. Jr. (Springer, 2016)
      Ba-Co-Ge intermetallic clathrates were synthesized in both type-I and chiral-type crystal structures to investigate thermoelectric and physical properties. Seebeck coefficients, thermal conductivities, electrical resistivities, ...
    • Thermomagnetic hysteresis effects in NiMn and NiNnPd thin films 
      Oner, Y.; Lue, C. S.; Ross, Joseph H. Jr.; Rathnayaka, K. D. D. (AIP Publishing, 2001)
      dc magnetization measurements, for zero-field cooled (MZFC) and field-cooled (MFC) cases, have been carried out for flash-evaporated Pd-doped NiMn thin films. These included reentrant phases (Ni76􏰁xPdx)Mn24, for 0􏰆x􏰆5, ...
    • Topological Nodal Line in ZrTe2 Demonstrated by Nuclear Magnetic Resonance 
      Tian, Yefan; Ghassemi, Nader; Ross, Joseph H. Jr. (2020)
      In this work, we report nuclear magnetic resonance (NMR) combined with density functional theory studies of the transition metal dichalcogenide ZrTe2. The measured NMR shift anisotropy reveals a quasi-two-dimensional ...
    • Transport and magnetic properties of NdCuGe compound 
      Goruganti, V.; Rathnayaka, K. D. D.; Ross, Joseph H. Jr.; Oner, Y.; Lue, C. S.; Kuo, Y. K. (AIP Publishing, 2008)
      Electrical resistivity,heat capacity, and dc magnetization measurements were performed on the AlB2-type intermetallics NdCuGe and LaCuGe over the temperature range of 2–300K. NdCuGe exhibits magnetization attributable to ...
    • Transport and thermodynamic properties under anharmonic motion in type-I Ba8Ga16Sn30 clathrate 
      Zheng, Xiang; Rodriguez, Sergio Y.; Saribaev, Laziz; Ross, Joseph H. Jr. (American Physical Society, 2012)
      Anharmonic guest atom oscillation has direct connection to the thermal transport and thermoelectric behavior of type-I Ba8Ga16Sn30 clathrates. This behavior can be observed through several physical properties, with for ...
    • Zintl behavior and vacancy formation in type-I Ba-Al-Ge clathrates 
      Sergio Y., Rodriguez; Saribaev, Laziz; Ross, Joseph H. Jr. (American Physical Society, 2010)
      In a study of type-I Ba8AlxGe46−x clathrates for 4≤x≤16, several samples with different stoichiometric compositions were prepared and measured. Here we report wavelength dispersion spectroscopy, powder x-ray diffraction ...