Biomedical subjects
HR Ott
Publications and source records attributed to HR Ott.
LiVGe2O6, an anomalous quasi-1D, S = 1 system, as revealed by NMR
We report the results of 7Li nuclear magnetic resonance (NMR) studies of LiVGe2O6, a quasi-one-dimensional spin S = 1 model system, at low temperatures. Our data, including NMR spectra and the temperature dependence of the spin-lattice relaxation rate T-11, indicate that a first-order phase transition occurs at T(c) approximately 23 K. The NMR response of LiVGe2O6 below T(c) suggests that the ordered phase is antiferromagnetic and has unusual features. Possible reasons for this unexpected behavior are discussed.
Spectroscopic evidence for unconventional superconductivity in UBe13
We report on measurements of the differential conductivity G of UBe13-Au contacts, which reveal the existence of low-energy Andreev surface bound states. These bound states are identified via huge conductance peaks at zero bias that may form only in superconductors with nontrivial energy-gap functions. From the voltage dependence of G at T 6.7, much in excess of the weak coupling BCS value of 3.5, and directly indicating strong coupling effects in superconducting UBe13.
Thermal conductivity of the hole-doped spin ladder system Sr14-xCaxCu24O41
The thermal conductivity of the spin-1/2 ladder system Sr14-xCaxCu24O41 ( x = 0, 2, and 12) has been measured both along ( kappa(c)) and perpendicular to ( kappa(a)) the ladder direction at temperatures between 5 and 300 K. While the temperature dependence of kappa(a) is typical for phonon heat transport, an unusual double-peak structure is observed for kappa(c)(T). We interpret this unexpected feature as a manifestation of quasi-one-dimensional magnon thermal transport mediated by spin excitations along the ladders.
Kondo disorder and non-Fermi-liquid behavior in UCu5-xPdx and CeCu5.9Au0.1.
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Low-Temperature Thermodynamic and Thermal-Transport Properties of Decagonal Al65Cu20Co15.
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Pressure dependence of the superconducting critical temperature of HgBa2Ca2Cu3O8+y and HgBa2Ca3Cu4O10+y up to 30 GPa.
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Structural scattering of phonons in quasicrystals.
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Explanation of the zero-bias anomaly in the tunneling characteristics of single-crystal Bi2Sr2CaCu2O8 with intrinsic Josephson tunneling.
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Scaling of the specific heat and magnetization of YBa2Cu3O7 in magnetic fields up to 7 T.
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Evidence for a non-s-wave superconducting order parameter in YBa2Cu3O6.6 with Tc=60 K.
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Sign reversal of the Hall resistivity of single-crystalline Bi1.95Sr1.65La0.4CuO6+ delta and Bi2Sr2CaCu2O8+ delta.
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Magnetically inhomogeneous ground state of CeAl3: An NMR study.
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Frequency and temperature dependence of the transport relaxation rate of the Kondo alloy U0.2Y0.8Pd3: Evidence for non-Fermi-liquid behavior.
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Absence of acoustic signature of the quadrupolar Kondo effect in U0.2Y0.8Pd3.
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Low-temperature thermal conductivity of icosahedral Al70Mn9Pd21.
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Nonlinear susceptibility: A direct test of the quadrupolar Kondo effect in UBe13.
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Low-temperature magnetic, thermal, and transport properties of FeSi.
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