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

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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:
CreatorsEmailORCIDORCID Put Code
Wang, ZheUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lorenz, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gorbunov, D., IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cong, P. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kohama, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Niesen, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Breunig, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Engelmayer, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herman, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wu, JiandaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kindo, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wosnitza, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zherlitsyn, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Loidl, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
BOSE-EINSTEIN CONDENSATION; MODELMultiple languages
Physics, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/18635

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