Theory of transverse phasons in potassium

Giuliani, Gabriele F.; Overhauser, A. W.

doi:10.1103/physrevb.21.5577

Cited by 19 publications

(7 citation statements)

References 13 publications

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“…For a free electron metalv; further simplifies to p,, = -p Y , = -p t o c 7 and p, = p,,,, -pZZ = p,. The current density given by [26] and [27] becomes For a sample rotating in a magnetic field, B is given by o B , where o is the angular frequency of rotation. Thus both the current and the measured induced torque saturate at high magnetic fields.…”

Section: Induced Torque Techniquementioning

confidence: 99%

“…The resistivity tensor in the *+t) * to zero. same coordinate system is T p T -' , which becomes The 5 component of [16] can be solved with the value of J , in [26] to give Next, the current density is expressed in terms of diagonal elements of the resistivity tensor as The total torque on the sample is given by [29] and the component along the y axis by…”

Section: Induced Torque Techniquementioning

confidence: 99%

“…They were also found to be linear combinations of the phonon modes which go linearly to zero in energy at a wave vector equal to the CDW wave vector (3). The dispersion curve of the phasons was calculated (26). The effect of phasons on electron scattering (27), specific heat (28), and the effective mass (29) was also determined.…”

Section: Introductionmentioning

confidence: 99%

“…The most recent references which are listed give earlier references. The Mayer-El Naby optical absorption (34), the splitting of conduction electron spin resonance ( 3 3 , helicon propagation (36), magnetoflicker noise (37), fourfold anisotropy of induced torque (8) and anisotropy extrapolated to zero field (38), low temperature specific heat (39), low temperature resistivity (40), neutron scattering (31), photoemission (41), and high-field open orbit magnetoresistance (17) were investigated.…”

Section: Introductionmentioning

confidence: 99%

“…This in turn was used to estimate the CDW satellite intensity (31). The magnetic susceptibility of an electron gas with a CDW was estimated by Boriack (32).…”

Section: Introductionmentioning

confidence: 99%

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Test of the charge density wave model of potassium

Coulter¹,

Datars²

1985

Can. J. Phys.

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Predictions of the charge density wave (CDW) model for potassium are tested by high-field induced torque experiments. The CDW model is described to show the open orbits on the Fermi surface of potassium with a CDW. Expressions for the induced torque are developed in terms of the resistivity and other parameters of the sample. The induced torque as a function of magnetic field direction shows sharp structure above 3-4 T with more than 20 peaks in 180" rotation. The peaks have the character of open orbits and the large number is predicted by the CDW model. The magnetic field, sample orientation, and temperature dependences of induced torque are also investigated. The magnetic field dependence agrees with that expected from open orbits with magnetic breakdown. However, the open orbits that would cause the induced torque peaks are not in directions predicted by the CDW model. Variation of induced tolque with temperatures between 1.4 and 2.1 K can be explained by some of the features of the model although the observed changes are larger than those predicted. The conclusion is that the CDW model explains many of the properties of the high-field induced torque structure.Des experiences de couples induits en champ ClevC ont permis de tester le modkle a onde de densite de charge pour le potassium. On dCcrit le modkle a onde de densite de charge, pour montrer les orbites ouvertes sur la surface de Fermi du potassium avec ce modkle. On dCveloppe des expressions donnant le couple induit en termes de la rCsistivitC et des autres paramktres de I'Cchantillon. La variation du couple induit en fonction de la direction du champ magnetique prCsente une structure bien dCfinie, au-dessus de 3-4 T , avec plus de 20 pics en 180" de rotation. Les pics ont le caractkre d'orbites ouvertes, et leur grand nombre est prCdit par le modele a onde de densite de charge. On Ctudie aussi I'influence du champ magnCtique, de I'orientation de I'Cchantillon et de la tempCrature sur le couple induit. La dCpendance du champ magnetique est en accord avec ce qu'on attend d'orbites ouvertes avec rupture magnktique. Toutefois les orbites qui devraient &tre la cause des pics de couple induit ne sont pas dans les directions prCdites par le modkle onde de densit6 de charge. Les variations de couple induit avec la temperature, entre 1,4 et 2 , l K peuvent s'expliquer par certaines particularitCs du modkle, bien que les changements observes dCpassent en grandeur les predictions du modkle. La conclusion est que le modkle onde de densite de charge explique plusieurs des propriCtCs de la structure du couple induit en champ ClevC.[Traduit par le journal]Can. J. Phys. 63. 159 (1985)

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Section: Induced Torque Techniquementioning

confidence: 99%

Section: Induced Torque Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This in turn was used to estimate the CDW satellite intensity (31). The magnetic susceptibility of an electron gas with a CDW was estimated by Boriack (32).…”

Section: Introductionmentioning

confidence: 99%

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