The following are some of our more recent research papers. The abstracts are available, and most of these papers may also be read or downloaded in PostScript and/or PDF.

We also have some theses (full-text access may be restricted) and talks available.

RECENT PUBLICATIONS

• Absolute value and temperature dependence of the magnetic penetration depth in Ba(Co_0.074Fe_0.926)₂As₂
  Oren Ofer, J. C. Baglo, M. D. Hossain, R. F. Kiefl, W. N. Hardy, A. Thaler, H. Kim, M. A. Tanatar, P. C. Canfield, R. Prozorov, G. M. Luke, E. Morenzoni, H. Saadaoui, A. Suter, T. Prokscha, B. M. Wojek, and Z. Salman,
  Phys. Rev. B 85, 060506(R) (2012).
• Angle dependence of quantum oscillations in YBa₂Cu₃O_6.59 shows free-spin behaviour of quasiparticles
  B. J. Ramshaw, Baptiste Vignolle, James Day, Ruixing Liang, W. N. Hardy, Cyril Proust, and D. A. Bonn,
  Nature Physics 7, 234-238 (2011).
• Oxygen chain disorder as the weak scattering source in YBa₂Cu₃O_6.50
  J. S. Bobowski, J. C. Baglo, J. Day, L. Semple, P. Dosanjh, P. J. Turner, R. Harris, R. Liang, D. A. Bonn, and W. N. Hardy,
  Phys. Rev. B 82, 134526 (2010).
• Precision microwave electrodynamic measurements of K- and Co-doped BaFe₂As₂
  J. S. Bobowski, J. C. Baglo, J. Day, P. Dosanjh, R. Ofer, B. J. Ramshaw, R. Liang, D. A. Bonn, W. N. Hardy, H. Luo, Z.-S. Wang, L. Fang, and H.-H. Wen,
  Phys. Rev. B 82, 094520 (2010).
• Encapsulated Single Crystal Growth and Annealing of the High-Temperature Superconductor Tl-2201
  D. C. Peets, Ruixing Liang, Mati Raudsepp, W. N. Hardy, and D. A. Bonn,
  J. Cryst. Growth 312, 344-350 (2010).
• X-Ray Absorption Spectra Reveal the Inapplicability of the Single-Band Hubbard Model to Overdoped Cuprate Superconductors
  D. C. Peets, D. G. Hawthorn, K. M. Shen, Young-June Kim, D. S. Ellis, H. Zhang, Seiki Komiya, Yoichi Ando, G. A. Sawatzky, Ruixing Liang, D. A. Bonn, and W. N. Hardy,
  Phys. Rev. Lett. 103, 087402 (2009).
• Tl₂Ba₂CuO_6+x Brings Spectroscopic Probes Deep Into the Overdoped Regime of the High-T_c Cuprates
  D. C. Peets, J. D. F. Mottershead, B. Wu, I. S. Elfimov, Ruixing Liang, W. N. Hardy, D. A. Bonn, M. Raudsepp, N. J. C. Ingle, and A. Damascelli,
  New J. Phys. 9, 28 (2007).
• Phenomenology of a-axis and b-axis charge dynamics from microwave spectroscopy of highly ordered YBa₂Cu₃O_6.50 and YBa₂Cu₃O_6.993
  R. Harris, P. J. Turner, Saeid Kamal, A. R. Hosseini, P. Dosanjh, G. K. Mullins, J. S. Bobowski, C. P. Bidinosti, D. M. Broun, Ruixing Liang, W. N. Hardy, and D. A. Bonn,
  Phys. Rev. B 74, 104508 (2006).
• Evaluation of CuO₂ plane hole doping in YBa₂Cu₃O_6+x Single Crystals
  Ruixing Liang, D.A. Bonn, and W.N. Hardy,
  Phys. Rev. B 73, 180505(R) (2006)
• Lower Critical Field and Superfluid Density of Highly Underdoped YBa₂Cu₃O_6+x Single Crystals
  Ruixing Liang, D. A. Bonn, W. N. Hardy, and David Broun,
  Phys. Rev. Lett. 94, 117001 (2005).
• Survival of the d-Wave Superconducting State Near the Edge of Antiferromagnetism in the Cuprate Phase Diagram
  A. Hosseini, D. M. Broun, D. E. Sheehy, T. P. Davis, M. Franz, W. N. Hardy, Ruixing Liang, and D.A. Bonn,
  Phys. Rev. Lett. 93, 107003 (2004).
• Weak-Limit Quasiparticle Scattering via Microwave Spectroscopy of a High Temperature Superconductor
  W. N. Hardy, P. J. Turner, R. Harris, Saeid Kamal, D. M. Broun, G. K. Mullins, Ruixing Liang, and D. A. Bonn,
  Physica C 408-410, 837 (2004). (M2S-Rio proceedings)
• Absolute Values of the London Penetration Depth in YBa₂Cu₃O_6-y Measured by Zero Field ESR Spectroscopy on Gd Doped Single Crystals
  T. Pereg-Barnea, P. J. Turner, R. Harris, G. K. Mullins, J. S. Bobowski, M. Raudsepp, Ruixing Liang, D. A. Bonn, and W. N. Hardy,
  Phys. Rev. B 69, 184513 (2004).
• Bolometric Technique for High-Resolution Broadband Microwave Spectroscopy of Ultra-Low-Loss Samples
  P. J. Turner, D. M. Broun, Saeid Kamal, M. E. Hayden, J. S. Bobowski, R. Harris, D. C. Morgan, J. S. Preston, D. A. Bonn, and W. N. Hardy, published in Rev. Sci. Instrum.
• Observation of Weak-Limit Quasiparticle Scattering via Broadband Microwave Spectroscopy of a d-Wave Superconductor
  P. J. Turner, R. Harris, Saeid Kamal, M. E. Hayden, D. M. Broun, D. C. Morgan, A. Hosseini, P. Dosanjh, G. Mullins, J. S. Preston, Ruixing Liang, D. A. Bonn, and W. N. Hardy, published in PRL.
• A Limit on Spin-Charge Separation in High-T_c Superconductors from the Absence of a Vortex-memory Effect
  D. A. Bonn, Janice C. Wynn, Brian W. Gardner, Yu-Ju Lin, Ruixing Liang, W. N. Hardy, J. R. Kirtley, and K. A. Moler, published in Nature.
• Top-Seeded Melt-Growth of YBa₂Cu₃O_x Crystals for Neutron Diffraction Studies
  D. C. Peets, Ruixing Liang, C. Stock, W. J. L. Buyers, Z. Tun, L. Taillefer, R. J. Birgeneau, D. A. Bonn, and W. N. Hardy, published in Journal of Superconductivity.
• Preparation and Characterization of Homogeneous YBCO Single Crystals with Doping Level near the SC-AFM Boundary
  Ruixing Liang, D. A. Bonn, W. N. Hardy, Janice C. Wynn, K. A. Moler, L. Lu, S. Larochelle, L. Zhou, M. Greven, L. Lurio, S. G. J. Mochrie, published in Physica C.
• Microwave Spectroscopy of Quasiparticle Transport in the b Direction of YBa₂Cu₃O_6.993
  R. Harris, A. Hosseini, Saeid Kamal, P. Dosanjh, Ruixing Liang, W. N. Hardy, and D. A. Bonn, published in Phys Rev B.
• High precision ac susceptometer for measuring the temperature and magnetic field dependence of the penetration depth in superconductor single crystals.
  C. P. Bidinosti and W. N. Hardy, published in Review of Scientific Instruments.
• Preparation and X-Ray Characterization of Highly Ordered Ortho-II Phase YBa₂Cu₃O_6.50 Single Crystals.
  Ruixing Liang, D. A. Bonn, and Walter N. Hardy. Published in Physica C.
• Microwave Spectroscopy of Thermally Excited Quasiparticles in YBa₂Cu₃O_6.99.
  A. Hosseini, R. Harris, Saied Kamal, P. Dosanjh, J. Preston, Ruixing Liang, W. N. Hardy, and D. A. Bonn, published in PRB.
• Magnetic Field Dependence of Lambda in YBa₂Cu₃O_6.95: Results as a Function of Temperature and Field Orientation.
  C. P. Bidinosti, W. N. Hardy, D. A. Bonn, and Ruixing Liang, published in PRL.
• Magnetic Penetration Depth and Surface Resistance in YBCO: New Results for Ultra High Purity Crystals.
  S. Kamal, Ruixing Liang, A. Hosseini, D. A. Bonn, and W. N. Hardy, published in PRB Rapid Comm.
  
• C-Axis Electrodynamics of YBCO.
  A. Hosseini, S. Kamal, D. A. Bonn, Ruixing Liang, and W. N. Hardy, published in PRL.
  
• Growth of High Quality YBCO Crystals Using BaZrO₃ Crucibles.
  Ruixing Liang, D. A. Bonn, and W. N. Hardy, published in Physica C.

OTHER ARTICLES

• Observation of a Geometric Barrier in YBa₂Cu₃O_6.95 Single Crystals.
  M. Gardner, S. A. Govorkov, Ruixing Liang, D. A. Bonn, J. F. Carolan, and W. N. Hardy, Published in JAP.
  
• Reproducible Growth of highly crystalline YBa₂Cu₃O₇ thin films on SrTiO₃ by scanning pulsed laser deposition.
  André Wong, Ruixing Liang, Michael Gardner, and Walter N. Hardy.
  Published in J Appl. Phys.
  
• Surface Impedance Studies of YBCO.
  D. A. Bonn, S. Kamal, A. Bonakdarpour, Ruixing Liang, W. N. Hardy, C. C. Homes, D. N. Basov, and T. Timusk,
  Czech. J. Phys. 46, 3195 (1996).
  
• The Microwave Surface Impedance of YBCO.
  D. A. Bonn, S. Kamal, Kuan Zhang, Ruixing Liang, and W. N. Hardy,
  J. Phys. Chem. Solids 56, 1941 (1995).
• Lower critical fields in an ellipsoid-shaped YBa₂Cu₃O_6.95 single crystal
  Ruixing Liang, P. Dosanjh, D. A. Bonn, W. N. Hardy, and A. J. Berlinsky, published in PRB.