Spin gap formation in SmB6

被引：15

作者：

Glushkov, V. V.

Kuznetsov, A. V.

Churkin, O. A.

Demishev, S. V.

Paderno, Yu. B.

Shitsevalova, N. Yu.

Sluchanko, N. E.

机构：

[1] Moscow Engn Phys Inst, Moscow 115409, Russia

[2] RAS, AM Prokhorov Gen Phys Inst, Moscow 119991, Russia

[3] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia

[4] Ukrainian Acad Sci, Inst Problems Mat Sci, UA-252680 Kiev, Ukraine

来源：

PHYSICA B-CONDENSED MATTER | 2006年 / 378-80卷 / 614-615期

基金：

俄罗斯基础研究基金会;

关键词：

intermediate valence; spin gap; many-body complexes;

D O I：

10.1016/j.physb.2006.01.167

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The precise measurements of magnetic properties have been carried out on single crystals of SmB6 for temperatures down to 4.2 K. It is shown that the non-monotonic temperature dependence of magnetic susceptibility chi(T) of SmB6 at T > 50 K can be well approximated by an activation type contribution chi(a)(7)similar to 1/Texp(-E-a/k(B)T) with E-a/k(B)similar to 65K. This behaviour can be attributed to a spin gap formation with thermally induced magnetic moments characterized by the value of mu(eff)similar to 1.6 mu(B). A correlation between the "intra-gap contribution" Delta chi(T) = chi(T)-chi(a)(T) observed below 50 K and temperature-dependent excitations appearing in inelastic neutron and Raman scattering spectra of SmB6 at T < 70 K is discussed in terms of many-body complexes which are formed in the regime of fast charge fluctuations on Sm-sites. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：614 / 615

页数：2

共 14 条

[1]

Aeppli G, 1992, COMMENTS COND MAT PH, V16, P155

[2] MAGNETIC EXCITATIONS IN SMB6 SINGLE-CRYSTALS [J].

ALEKSEEV, PA ;

MIGNOT, JM ;

ROSSATMIGNOD, J ;

LAZUKOV, VN ;

SADIKOV, IP .

PHYSICA B-CONDENSED MATTER, 1993, 186-88 :384-386

[3] Valence and magnetic instabilities in Sm compounds at high pressures [J].

Barla, A ;

Sanchez, JP ;

Derr, J ;

Salce, B ;

Lapertot, G ;

Flouquet, J ;

Doyle, BP ;

Leupold, O ;

Rüffer, R ;

Abd-Elmeguid, MM ;

Lengsdorf, R .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2005, 17 (11) :S837-S848

[4] Low-temperature magnetic properties of SmB6 [J].

Flachbart, K ;

Gabáni, S ;

Herrmannsdörfer, T ;

Konovalova, E ;

Paderno, Y ;

Pavlik, V .

PHYSICA B, 2000, 284 :1353-1354

[5] Pressure-induced Fermi-liquid behavior in the Kondo insulator SmB6:: Possible transition through a quantum critical point -: art. no. 172406 [J].

Gabáni, S ;

Bauer, E ;

Berger, S ;

Flachbart, K ;

Paderno, Y ;

Paul, C ;

Pavlík, V ;

Shitsevalova, N .

PHYSICAL REVIEW B, 2003, 67 (17)

[6]

Glushkov V, 2003, ACTA PHYS POL B, V34, P1097

[7] MAGNETIC EXCITATIONS IN INTERMEDIATE-VALENCE SEMICONDUCTORS WITH A SINGLET GROUND-STATE [J].

KIKOIN, KA ;

MISHCHENKO, AS .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1995, 7 (02) :307-313

[8] PHYSICAL PROPERTIES OF SMB6 [J].

NICKERSON, JC ;

WHITE, RM ;

LEE, KN ;

BACHMANN, R ;

GEBALLE, TH ;

HULL, GW .

PHYSICAL REVIEW B-SOLID STATE, 1971, 3 (06) :2030-+

[9] Low-energy excitations of the correlation-gap insulator SmB6: A light-scattering study [J].

Nyhus, P ;

Cooper, SL ;

Fisk, Z ;

Sarrao, J .

PHYSICAL REVIEW B, 1997, 55 (18) :12488-12496

[10] NMR AND SPIN-CHARGE FLUCTUATIONS IN INTERMEDIATE-VALENT SMB6 [J].

PENA, O ;

MACLAUGHLIN, DE ;

LYSAK, M ;

FISK, Z .

JOURNAL OF APPLIED PHYSICS, 1981, 52 (03) :2152-2154

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