Universität zu Köln

Tchougreeff, Andrei L. ORCID: 0000-0002-8077-1168, Liu, Xiaohui, Mueller, Paul, van Beek, Wouter, Ruschewitz, Uwe ORCID: 0000-0002-6511-6894 and Dronskowski, Richard (2012). Structural Study of CuNCN and Its Theoretical Implications: A Case of a Resonating-Valence-Bond State? J. Phys. Chem. Lett., 3 (22). S. 3360 - 3367. WASHINGTON: AMER CHEMICAL SOC. ISSN 1948-7185

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Abstract

We present the results of a high-resolution low-temperature synchrotron structural study of the nitrogen-containing analogue of cupric oxide, copper carbodiimide (CuNCN). The material clearly manifests a surprising nonmonotonous behavior of the a lattice parameter as a function of the temperature: its decrease with decreasing temperature turns to a distinguishable increase below 100 K. The onset temperature of this anomaly nearly coincides with that of the onset of the activation temperature dependence, as seen from the magnetic susceptibility, which has been tentatively attributed to the formation of a gapped 2D spin-liquid (resonating-valence-bond) state. In accord with this assumption, we develop a theory relating the temperature behavior of the spin susceptibility to that of the lattice parameter, which semiquantitatively agrees with the observed behavior.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Tchougreeff, Andrei L. UNSPECIFIED orcid.org/0000-0002-8077-1168 UNSPECIFIED Liu, Xiaohui UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, Paul UNSPECIFIED UNSPECIFIED UNSPECIFIED van Beek, Wouter UNSPECIFIED UNSPECIFIED UNSPECIFIED Ruschewitz, Uwe UNSPECIFIED orcid.org/0000-0002-6511-6894 UNSPECIFIED Dronskowski, Richard UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-478883
DOI:	10.1021/jz301722b
Journal or Publication Title:	J. Phys. Chem. Lett.
Volume:	3
Number:	22
Page Range:	S. 3360 - 3367
Date:	2012
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1948-7185
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIGH-TC SUPERCONDUCTIVITY; COPPER CARBODIIMIDE; MOLECULES Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47888