Electron - phonon effects in heavy fermion systems

Lüthi, B.; Bruls, G.; Thalmeier, Peter; Wolf, B.; Finsterbusch, D.; Kouroudis, I.

doi:10.1007/bf00754941

Cited by 63 publications

(16 citation statements)

References 34 publications

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“…In the following we will focus on the results obtained at 75 MHz which exhibit the highest signal-to-noise ratio. By using a phase-sensitive detection technique [21] …”

Section: Methodsmentioning

confidence: 99%

Magnetoelastic couplings in the distorted diamond-chain compound azurite

et al. 2014

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We present results of ultrasonic measurements on a single crystal of the distorted diamond-chain compound azurite Cu 3 (CO 3 ) 2 (OH) 2 . Pronounced elastic anomalies are observed in the temperature dependence of the longitudinal elastic mode c 22 which can be assigned to the relevant magnetic interactions in the system and their couplings to the lattice degrees of freedom. From a semiquantitative analysis of the magnetic contribution to c 22 the magnetoelastic coupling G = ∂J 2 /∂ b can be estimated, where J 2 is the intradimer coupling constant and b the strain along the intrachain b axis. We find an exceptionally large coupling constant of |G| ∼ 3650 K highlighting an extraordinarily strong sensitivity of J 2 against changes of the b-axis lattice parameter. These results are complemented by measurements of the hydrostatic pressure dependence of J 2 by means of thermal expansion and magnetic susceptibility measurements performed both at ambient and finite hydrostatic pressure. We propose that a structural peculiarity of this compound, in which Cu 2 O 6 dimer units are incorporated in an unusually stretched manner, is responsible for the anomalously large magnetoelastic coupling.

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“…In the following we will focus on the results obtained at 75 MHz which exhibit the highest signal-to-noise ratio. By using a phase-sensitive detection technique [21] …”

Section: Methodsmentioning

confidence: 99%

Magnetoelastic couplings in the distorted diamond-chain compound azurite

et al. 2014

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“…Changes of the sound velocity δv and the renormalised amplitude of the sound wave 1 − Z were measured as functions of magnetic field at constant temperatures, using the experimental set up described in detail in Ref. 40.…”

Section: Ultrasound Experiments On Cs2cucl4mentioning

confidence: 99%

Many-body theory of magnetoelasticity in one dimension

et al. 2017

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We construct a many-body theory of magneto-elasticity in one dimension and show that the dynamical correlation functions of the quantum magnet, connecting the spins with phonons, involve all energy scales. Accounting for all magnetic states non-perturbatively via the exact diagonalisation techniques of Bethe ansatz, we find that the renormalisation of the phonon velocity is a non-monotonous function of the external magnetic field and identify a new mechanism for attenuation of phonons -via hybridisation with the continuum of excitations at high energy. We conduct ultrasonic measurements on a high-quality single crystal of the frustrated spin-1/2 Heisenberg antiferromagnet Cs2CuCl4 in its nearly one-dimensional regime and confirm the theoretical predictions, demonstrating that ultrasound can be used as a powerful probe of strong correlations in one dimension.

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“…The velocity and attenuation of sound waves were measured using a phase-sensitive detection technique based on the standard ultrasonic pulse-echo method [6]. The measurements of the specificheat, C(T), were performed using a sensitive ac technique [7].…”

Section: Experiments and Resultsmentioning

confidence: 99%

Critical phenomena at the antiferromagnetic phase transition of azurite

Cong

Wolf

Manna

et al. 2013

Journal of the Korean Physical Society

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We report on high-resolution acoustic, specific-heat and thermal expansion measurements in the vicinity of the antiferromagnetic phase transition at T N = 1.88 K on a high-quality single crystal of the natural mineral azurite. A detailed investigation of the critical contribution to the various quantities at T N is presented. The set of critical exponents and amplitude ratios of the singular contributions above and below the transition indicate that the system can be reasonably well described by a three-dimensional Heisenberg antiferromagnet.

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Electron - phonon effects in heavy fermion systems

Cited by 63 publications

References 34 publications

Magnetoelastic couplings in the distorted diamond-chain compound azurite

Magnetoelastic couplings in the distorted diamond-chain compound azurite

Many-body theory of magnetoelasticity in one dimension

Critical phenomena at the antiferromagnetic phase transition of azurite

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