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By Arthur S. Nowick

This publication offers with the impact of crystal symmetry in picking out the tensor houses of crystals. even though this can be a well-established topic, the writer presents a brand new process utilizing crew concept and, particularly, the strategy of symmetry coordinates, which has now not been utilized in any past booklet. the writer offers functions to technologically very important phenomena as diversified because the electro-optic, piezoelectric, photoelastic, piezomagnetic, and piezoresistance results, in addition to magnetothermoelectric energy and third-order elastic constants. He additionally offers realization to ''special magnetic properties'', i.e., those who require the options of time reversal and magnetic symmetry--an vital topic no longer continually coated in different books during this quarter. This booklet could be of curiosity to researchers in good nation physics and fabrics technological know-how, and also will be appropriate as a textual content for graduate scholars in physics and engineering taking classes in reliable kingdom physics.

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A similar possibility exists for the introduction of a horizontal mirror plane to produce groups % = ^i x °h- In this case, the two sets of irreps are denoted by adding primes and double primes to the original irreps of %. Examples are C3h = C3 x ah and D3h = D3 x ah. Another matter that requires special attention is the case of complex characters. In certain low-symmetry groups complex numbers appear among the characters of some one-dimensional irreps. ) In such cases, the irreps appear as pairs in which the characters are complex conjugates of each other.

To these theorems we add the following: 3. Existence of a totally symmetric irrep: every group has a one-dimensional irrep for which x(R) = D(R) = 1 for every operation R. g. A, A', A g or Aig). 4. Since D(E) for the identity operation must be the (diagonal) unit matrix of dimensionality la, it follows that x(a)(E) = la. 5. The orthogonality theorem for characters: If a and /3 are two irreps of a group <§ of order h, then (3-13) Z*#«)(/i)*a

2-2 Thermoelectric effects For our present purposes, the thermoelectric cross effects will be considered. We concern ourselves only with simultaneous heat and electrical flow involving the fluxes ht and /,- that appeared in Eqs. (1) and (2). It can then be shown, in accordance with the requirements of Eq. (7), that the correct choice for the thermal force is x^ = -(i/r)vr (2-8) Xe = - V 0 (2-9) and for the electrical force where 4> - 0 " V>fc is a generalization of the electrical potential, called the electrochemical potential, which includes the chemical potential \i of the electrons.

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