Universität zu Köln

Zacharias, Mario, Paul, Indranil and Garst, Markus ORCID: 0000-0001-5390-3316 (2015). Quantum Critical Elasticity. Phys. Rev. Lett., 115 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

We discuss elastic instabilities of the atomic crystal lattice at zero temperature. Because of long-range shear forces of the solid, at such transitions the phonon velocities vanish, if at all, only along certain crystallographic directions, and, consequently, the critical phonon fluctuations are suppressed to a lower dimensional manifold and governed by a Gaussian fixed point. In the case of symmetry-breaking elastic transitions, a characteristic critical phonon thermodynamics arises that is found, e.g., to violate Debye's T-3 law for the specific heat. We point out that quantum critical elasticity is triggered whenever a critical soft mode couples linearly to the strain tensor. In particular, this is relevant for the electronic Ising-nematic quantum phase transition in a tetragonal crystal as discussed in the context of certain cuprates, ruthenates, and iron-based superconductors.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zacharias, Mario UNSPECIFIED UNSPECIFIED UNSPECIFIED Paul, Indranil UNSPECIFIED UNSPECIFIED UNSPECIFIED Garst, Markus UNSPECIFIED orcid.org/0000-0001-5390-3316 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-398894
DOI:	10.1103/PhysRevLett.115.025703
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	115
Number:	2
Date:	2015
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STRUCTURAL PHASE-TRANSITIONS; IRON-BASED SUPERCONDUCTORS; GRUNEISEN-PARAMETER; CRITICAL-DYNAMICS; CRITICAL-POINTS; INSTABILITIES; ORDER Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39889