Phonon and magnon Raman scattering in CuB2O4

被引：12

作者：

Ivanov, V. G. ^{[1
]}

Abrashev, M. V. ^{[1
]}

Todorov, N. D. ^{[1
]}

Tomov, V. ^{[2
]}

Nikolova, R. P. ^{[3
]}

Litvinchuk, A. P. ^{[4
]}

Iliev, M. N. ^{[4
]}

机构：

[1] Univ Sofia, Fac Phys, BG-1164 Sofia, Bulgaria

[2] Bulgarian Acad Sci, Inst Solid State Phys, BG-1184 Sofia, Bulgaria

[3] Bulgarian Acad Sci, Inst Mineral & Crystallog, BG-1113 Sofia, Bulgaria

[4] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 09期

关键词：

BILBAO CRYSTALLOGRAPHIC SERVER; PHASE; 10; K; COPPER METABORATE; CRYSTAL-STRUCTURE; DATABASES;

D O I：

10.1103/PhysRevB.88.094301

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Brillouin-zone-center phonons and two-magnon excitations in CuB2O4 are studied experimentally by polarized Raman spectroscopy. Most of the expected modes are clearly pronounced and their symmetry unambiguously identified from the polarization selection rules. The experimentally observed transverse optical phonon frequencies are in good agreement with those obtained by means of density functional theory. The two-magnon scattering band is centered at 82 cm(-1) and is clearly identified at temperatures below the Neel temperature T-N. The spectral shape of the two-magnon band confirms the existing theoretical models of magnon dispersion in the commensurate phase of CuB2O4 and suggests an exchange integral of J = 33 cm(-1) (48 K) between the nearest-neighbor Cu(A) ions. The quantitative line-shape analysis of the two-magnon band evidences for additional magnon self-energy contributions below the temperature T* of the commensurate-to-incommensurate phase transition.

引用

页数：8

共 27 条

[1]

ABDULLAEV GK, 1981, J STRUCT CHEM+, V22, P637

[2]

[Anonymous], 2010, CRYSALISPRO

[3] Bilbao crystallographic server. II. Representations of crystallographic point groups and space groups [J].

Aroyo, MI ;

Kirov, A ;

Capillas, C ;

Perez-Mato, JM ;

Wondratschek, H .

ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 2006, 62 :115-128

[4] Bilbao crystallographic server: I. Databases and crystallographic computing programs [J].

Aroyo, MI ;

Perez-Mato, JM ;

Capillas, C ;

Kroumova, E ;

Ivantchev, S ;

Madariaga, G ;

Kirov, A ;

Wondratschek, H .

ZEITSCHRIFT FUR KRISTALLOGRAPHIE, 2006, 221 (01) :15-27

[5] Optical absorption of copper metaborate CuB2O4 [J].

Bezmaternykh, LN ;

Potseluiko, AM ;

Erlykova, EA ;

Édel'man, IS .

PHYSICS OF THE SOLID STATE, 2001, 43 (02) :309-310

[6] Complex magnetic ground state of CuB2O4 -: art. no. 024405 [J].

Boehm, M ;

Roessli, B ;

Schefer, J ;

Wills, AS ;

Ouladdiaf, B ;

Lelièvre-Berna, E ;

Staub, U ;

Petrakovskii, GA .

PHYSICAL REVIEW B, 2003, 68 (02)

[7] Spin-wave spectrum of copper metaborate in the commensurate phase 10 K < T < 21 K [J].

Boehm, M ;

Martynov, S ;

Roessli, B ;

Petrakovskii, G ;

Kulda, J .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2002, 250 (1-3) :313-318

[8] THEORY OF RAMAN-SCATTERING IN LAYERED CUPRATE MATERIALS [J].

CANALI, CM ;

GIRVIN, SM .

PHYSICAL REVIEW B, 1992, 45 (13) :7127-7160

[9] RESONANT 2-MAGNON RAMAN-SCATTERING IN PARENT COMPOUNDS OF HIGH-T-C SUPERCONDUCTORS [J].

CHUBUKOV, AV ;

FRENKEL, DM .

PHYSICAL REVIEW B, 1995, 52 (13) :9760-9783

[10] First principles methods using CASTEP [J].

Clark, SJ ;

Segall, MD ;

Pickard, CJ ;

Hasnip, PJ ;

Probert, MJ ;

Refson, K ;

Payne, MC .

ZEITSCHRIFT FUR KRISTALLOGRAPHIE, 2005, 220 (5-6) :567-570

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