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Creator | Title | Description | Subject | Date |
26 |
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Mattis, Daniel C. | Magnetization of Ising model in nonzero magnetic field | Knowing only the zero-field magnetization (e.g., Yang's result) of the Ising model in any number of dimensions, one can construct a lower bound on m(h), the magnetization in finite field. Knowledge of u, the internal energy per bond, enables a more efficient lower bound to be constructed. Both are ... | Magnetization; Griffiths inequality | 1969 |
27 |
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Ailion, David Charles | Low cost integrated circuit versatile pulse and frequency counter | In this paper we describe a compact multipurpose counter whose design is based on the use of plastic integrated circuits. The circuit contains about $90 worth of semiconductor components and is very easy to wire; nevertheless, it is extremely versatile. It consists of dual 107 and 106 counters which... | Integrated circuits; Counters; Physics instruments | 1969 |
28 |
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Ailion, David Charles | New two-point calibration method for platinum resistance thermometers for the range 75-400K | In this paper we describe a new method for calibrating high quality platinum resistance thermometers to ±0.01 "C over the temperature range 75-400 K. This method requires resistance measurements at only two temperatures (liquid nitrogen and the ice point) in contrast to other methods which require ... | Platinum; Resistance thermometers; Physics instruments | 1969 |
29 |
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Ailion, David Charles | Low cost high linearity solid state digital double boxcar | In this article, we describe a digital solid state double boxcar of infinite holding time and very high linearity. It uses a Hewlett-Packard (HP2212 A-M3) voltage-to-frequency converter (VFC) whose output is accumulated on a running counter, thereby providing signal averaging with an infinite holdin... | High linearity; Boxcar; Instruments, Physics | 1969 |
30 |
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Mattis, Daniel C. | Effects of orbital degeneracy on a magnetic impurity in a nonmagnetic metal | We study the Green's-function equations for a version of the two-orbital Anderson model of a magnetic impurity, in an approximation scheme that displays the logarithmic anomalies and enables the Kondo temperature Tĸ to be calculated as a function of the parameters. The nature of the solutions is ex... | Orbital degeneracy; Magnetic impurities; Nonmagnetic metal; Kondo temperature; Anomalous resonances | 1969-02 |
31 |
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Symko, Orest George | Adiabatic compressional cooling of He3 | By adiabatic compression of a two-phase mixture of liquid and solid He3, temperatures below 2.5 mK have been obtained. These are in the range expected for nuclear ordering in solid He3. | He3; Adiabatic compressional cooling | 1969-03 |
32 |
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Mattis, Daniel C. | Theory of electronic switching effect as a cooperative phenomenon | A modified form of Zener tunneling theory, in which we assume that the tunneling barrier is a decreasing collective function of electronic excitation, is shown to imply insulator- to-metal switching characteristics similar to those reported by Ovshinsky for glass film devices. In addition, our І-V ... | Electronic switching; Negative resistance | 1969-05 |
33 |
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Symko, Orest George | Substantial nuclear ordering in solid He3 | Evidence for a substantial nuclear ordering in solid bcc He3 at melting pressure has been inferred from solid entropies s s deduced from measurements of the slope of the melting curve for a liquid-solid mixture cooled by adiabatic compression. At 3.4 mK we find experimentally that sS/R = 0.83 ln2. I... | Solid He3; Nuclear ordering; Ordered nuclear spins; Bulk nuclear polarization | 1969-11 |
34 |
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Mattis, Daniel C. | Existence of two phase transitions in Hubbard model | We solve the Hubbard model, for one electron per atom in a simple cubic structure, using one-particle Green's functions. We determine the accuracy of this calculation to be good by comparison with an exact solution by Lieb and Wu of a one-dimensional limiting case. | Critical temperature | 1969-12 |
35 |
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Mattis, Daniel C. | Switching in magnetite: a thermally driven magnetic phase transition | We have performed a variety of experiments on switching phenomena in a metal oxide, magnetite. Our findings are consistent with Joule microheating which drives the Verwey transition occurring at 119 K. We conclude that considerations of band structure, direct electric-field-induced transitions, tunn... | Negative resistance; Electrical switching; Verwey transition; Joule heating | 1969-12 |
36 |
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DeTar, Carleton | Multiperipheral dynamics at general momentum transfer | We extend the group-theoretical analysis of the multiperipheral integral equation of Chew, Goldberger, and Low to general momentum transfers. Using a set of variables for the multiparticle phase space analogous to those of Bali, Chew, and Pignotti, we obtain, through the 0(2,1) symmetry, a partial... | Multiperipheral model | 1969-12 |
37 |
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Ailion, David Charles | Frequency modulation method for performing adiabatic demagnetization in the rotating reference frame | A new method for preforming adiabatic demagnetization in the rotating reference frame in NMR experiments is presented in this paper. In this new method the frequency of a crystal oscillator rather than the actual magnetic field is pulsed off resonance. Using simple circuits which are described in th... | Demagnetization; Physics experiments; NMR | 1970 |
38 |
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Ailion, David Charles | Self-switching Q-damping circuit for reducing transmitter ringdown time in high power pulse NMR | In this paper we describe a circuit for reducing the transmitter ringdown time and thereby improving the recovery time in pulse NMR experiments. The circuit uses only solid state devices and requires no external switching. For transmitter voltages less than 0.5 V peak to peak the effective resista... | Circuits; NMR experiments; Rf pulse | 1970 |
39 |
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DeTar, Carleton | O(2,1) decomposition of the equal-mass multipheripheral equation at t=0 | We extend the results of a group-theoretical analysis of the t=0 multiperipheral equation to the case t<0 for pairwise equal masses. Using variables discussed in a previous paper, we diagonalize the equation in the Bali-Chew-Pignotti (BCP) model with respect to the 0(2, 1) group and relate the solut... | Multiperipheral model; Unitaries | 1970-05 |
40 |
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Mattis, Daniel C. | Role of phonons and band structure in metal-insulator phase transition | We present a soluble model of electrons interacting with lattice vibrations which displays metallic, superconducting, and insulating phases. We solve the thermodynamics of this model and discuss its properties. The metal-insulator phase transition is second order for sc and bcc tight-binding bands. ... | Band structure | 1970-08 |
41 |
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DeTar, Carleton | Two-fireball phenomenon and the multiperipheral model | In the context of the Chew-Snider version of the Amati-Bertocchi-Fubini-Stanghellini-Tonin pion-exchange model, we investigate certain multiperipheral mechanisms that could account for those phenomena that have hitherto motivated the two-fireball model. These mechanisms are (1) double diffractive ... | Multiperipheral model; Fireballs | 1970-08 |
42 |
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Mattis, Daniel C. | Two-dimensional Ising model in a finite magnetic field | We present the results of numerical calculations giving accurate estimates of the magnetization of the two-dimensional Ising model on a square lattice. Moreover, we argue that these results are strict lower bounds to the correct magnetization M(H, T). The estimates are obtained by dividing the infin... | Magnetization | 1970-10 |
43 |
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Symko, Orest George | Continuously operating 4He evaporation refrigerator | A simple and compact device was developed to provide continuous, self-regulating refrigeration at approximately 1.3 K. The temperature of the device remains nearly constant, independent of external power, up to a critical power. For a molar flow rate of 10^-4 moles/sec, the refrigerator can absorb... | 4He evaporation refrigerator | 1971 |
44 |
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DeTar, Carleton | Momentum spectrum of hadronic secondaries in the multiperipheral model | Motivated by a simplified multiperipheral model, we formulate a general qualitative description of the momentum spectrum of secondaries, resulting from a collision of two hadrons at high energies. Arguing from two fundamental multiperipheral concepts, (a) that transverse momenta are limited and (b... | Secondaries; Multiperipheral model; Fireballs | 1971-01 |
45 |
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Mattis, Daniel C. | Critical curves and thermodynamic phases of lattice fluids and antiferromagnets with structured interactions | We study the classical lattice gas with hard cores, nearest-neighbor repulsive forces, and next-nearest-neighbor attractive forces. We find several thermodynamic phases (vapor, liquid, and solid) and unusually shaped critical curves, yet no critical point or triple point. We find and discuss discont... | Ising antiferromagnet; Molecular field theory | 1971-06 |
46 |
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Mattis, Daniel C. | Short-range versus long-range order in a model binary alloy | We calculate the free energy of a linear binary metallic alloy using an exact transfer-matrix formalism. We obtain for the first time the electronic band structure when there is nonvanishing short-range order and calculate the temperature dependence of the short-range order parameter. Following Foo... | Binary alloys; Density of state; Free energy | 1971-07 |
47 |
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Mattis, Daniel C. | Exactly solvable model of a magnetic impurity | A slight modification of the "mixing" term in Anderson's model of a magnetic impurity produces an exactly solvable model. Results of some preliminary calculations are given, and upper and lower bounds on Anderson's model are obtained by means of the exact solutions. . | Magnetic impurity; Ground-state energy; Free energy | 1971-11 |
48 |
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Ailion, David Charles | New technique for determining the diffusion mechanism by NMR: application to Cl35 diffusion in TlCl | A major problem in the study of atomic motions is the determination of the dominant mechanism responsible for translational diffusion. Recently Ailion and Ho predicted that the rotating-frame spin-lattice relaxation time T l p would have an angular dependence which depends on the diffusion mechanis... | Diffusion; Solids; NMR | 1972 |
49 |
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Mattis, Daniel C. | Exactly soluble model of interacting electrons | We diagonalize a many-fermion Hamiltonian consisting of terms quadratic as well as quartic in the field operators. A dual spectrum of eigenstates is an interesting result. We also derive a formula for obtaining the free energy at finite temperature. | Eigenstates; Free energy; Excitation spectrum | 1972 |
50 |
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Ailion, David Charles | Protein hydration changes in the formation of the nicotinamide adenine dinucleotide complexes of glyceraldehyde 3-phosphate dehydrogenase of yeast. II. The spin lattice relaxation of solvent water protons | The glyceraldehyde 3-phosphate dehydrogenase of yeast is known to undergo a particle volume contraction and the commensurate loss of a hydration component when it forms a complex with NAD. We have inquired whether the water movement in the conformational transition can be monitored by measurements ... | Protein hydration; Nicotinamide adenine dinucleotide complexes; Glyceraldehyde 3 phosphate dehydrogenase; Solvent water protons | 1973 |