Universität zu Köln

Wang, Zhe, Lorenz, T., Gorbunov, D., I, Cong, P. T., Kohama, Y., Niesen, S., Breunig, O., Engelmayer, J., Herman, A., Wu, Jianda, Kindo, K., Wosnitza, J., Zherlitsyn, S. and Loidl, A. (2018). Quantum Criticality of an Ising-like Spin-1/2 Antiferromagnetic Chain in a Transverse Magnetic Field. Phys. Rev. Lett., 120 (20). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

Full text not available from this repository.

Abstract

We report on magnetization, sound-velocity, and magnetocaloric-effect measurements of the Ising-like spin-1/2 antiferromagnetic chain system BaCo2V2O8 as a function of temperature down to 1.3 K and an applied transverse magnetic field up to 60 T. While across the Neel temperature of T-N similar to 5 K anomalies in magnetization and sound velocity confirm the antiferromagnetic ordering transition, at the lowest temperature the field-dependent measurements reveal a sharp softening of sound velocity v(B) and a clear minimum of temperature T(B) at (c,3D)(B perpendicular to) = 21.4 T, indicating the suppression of the antiferromagnetic order. At higher fields, the T(B) curve shows a broad minimum at B-perpendicular to(c) = 40 T, accompanied by a broad minimum in the sound velocity and a saturationlike magnetization. These features signal a quantum phase transition, which is further characterized by the divergent behavior of the Gruneisen parameter Gamma(B) alpha (B - B perpendicular to(c))(-1) . By contrast, around the critical field, the Gruneisen parameter converges as temperature decreases, pointing to a quantum critical point of the one-dimensional transverse-field Ising model.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wang, Zhe UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gorbunov, D., I UNSPECIFIED UNSPECIFIED UNSPECIFIED Cong, P. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kohama, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Niesen, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Breunig, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Engelmayer, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Herman, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wu, Jianda UNSPECIFIED UNSPECIFIED UNSPECIFIED Kindo, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wosnitza, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zherlitsyn, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Loidl, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-186354
DOI:	10.1103/PhysRevLett.120.207205
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	120
Number:	20
Date:	2018
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 BOSE-EINSTEIN CONDENSATION; MODEL Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18635