Field-induced quantum soliton lattice in a frustrated two-leg spin-1/2 ladder

Casola, Francesco and Shiroka, Toni and Feiguin, Adrian and Wang, Shuang and Grbić, Mihael Srđan and Horvatić, Mladen and Kramer, Steffen and Mukhopadhyay, Sutirtha and Conder, K. and Berthier, Claude and Ott, Hans Rudolf and Ronnow, Henrik Moodysson and Ruegg, Christian and Mesot, Joël (2013) Field-induced quantum soliton lattice in a frustrated two-leg spin-1/2 ladder. Physical Review Letters, 110 (18). pp. 187201-5. ISSN 0031-9007

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The field-induced quantum phase transitions (QPT) of the spin ladder material Bi(Cu(1-x)Znx)2PO6 have been investigated via 31P nuclear magnetic resonance (NMR) on single-crystal samples with x = 0 and x = 0.01. Measurements at temperatures between 0.25 K and 20 K in magnetic fields up to 31 T served to establish the nature of the various phases. In BiCu2PO6, an incommensurate (IC) magnetic order develops above a critical field mu0*H(c1) ~ 21 T ; the field and temperature dependences of the NMR lines and the resulting model for the spin structure are discussed. Supported by results of Density-Matrix Renormalization Group (DMRG) calculations it is argued that the observed field-induced IC order involves the formation of a magnetic-soliton lattice. An additional QPT is predicted to occur at H > H(c1). For x = 0.01, this IC order is found to be stable against site disorder, although with a renormalized critical field.

Item Type: Article
Keywords: frustration, magnetism, soliton, ladder, fractional excitations
Date: April 2013
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2013) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1022
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 04 Jun 2014 19:49
Last Modified: 23 Feb 2016 15:26

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